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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.0730 | Bringfried Stecklum | Bringfried Stecklum, Helmut Meusinger, Dirk Froebrich | Herbig-Haro Objects - Tracers of the Formation of Low-mass Stars and
Sub-stellar Objects | contribution presented at the 5th Stromlo Symposium, 5 pages, 4
Figures. Accepted for publication in Astrophysics & Space Science | Astrophys.SpaceSci.311:63-67,2007 | 10.1007/s10509-007-9573-x | null | astro-ph | null | Herbig-Haro objects (HHOs) are caused by outflows from young objects. Since
the outflow relies on mass accretion from a circumstellar disk, it indicates
ongoing growth. Recent results of infrared observations yielded evidence for
disks around brown dwarfs. This suggests that at least a certain fraction of
brown dwarfs forms like stars. Thus, young sub-stellar objects might cause HHOs
as well. We present selected results of a general survey for HHOs based on
DSS-II plates and CCD images taken with the Tautenburg Schmidt telescope.
Numerous young objects could be identified due to their association with newly
detected HHOs. In some cases the luminosity is consistent with very low-mass
stars or close to sub-stellar values. This holds for L1415-IRS and a few
infrared sources embedded in other dark clouds (e.g., GF9, BHR111). The
question on the minimum mass for outflow activity is addressed.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 07:57:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stecklum",
"Bringfried",
""
],
[
"Meusinger",
"Helmut",
""
],
[
"Froebrich",
"Dirk",
""
]
] |
0707.0731 | Mikhail Zubkov | M.A.Zubkov | $Z_6$ symmetry of the Standard Model and Technicolor theory | Latex, 16 pages | Physics Letters B674 (2009), 325-329 | 10.1016/j.physletb.2009.03.032 | ITEP-LAT/2007-11 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility to continue the $Z_6$ symmetry of the Standard
Model to the Technicolor theories. Among the SU(N) Weinberg - Susskind models
and the SU(N) Farhi - Susskind models for $N>2$ only the SU(4) Farhi - Susskind
model may possess the mentioned symmetry. We also show that the hypercharge
assignment of Minimal Walking SU(2) Technicolor model may be chosen in such a
way that the additional discrete symmetry is preserved.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 07:58:08 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Feb 2009 09:41:16 GMT"
},
{
"version": "v3",
"created": "Wed, 8 Apr 2009 10:13:22 GMT"
}
] | 2009-04-08T00:00:00 | [
[
"Zubkov",
"M. A.",
""
]
] |
0707.0732 | Alexander Savin | A. M. Savin, M. Meschke, J. P. Pekola, Yu. A. Pashkin, T. F. Li, H.
Im, and J. S. Tsai | Parity effect in Al and Nb single electron transistors in a tunable
environment | 3 pages, 3 figures | null | 10.1063/1.2768897 | null | cond-mat.supr-con | null | Two different types of Cooper pair transistors, with Al and Nb islands, have
been investigated in a tunable electromagnetic environment. The device with an
Al island demonstrates gate charge modulation with 2e-periodicity in a wide
range of environmental impedances at bath temperatures below 340 mK. Contrary
to the results of the Al sample, we were not able to detect 2e-periodicity
under any conditions on similar samples with Nb island. We attribute this to
the material properties of Nb.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:26:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Savin",
"A. M.",
""
],
[
"Meschke",
"M.",
""
],
[
"Pekola",
"J. P.",
""
],
[
"Pashkin",
"Yu. A.",
""
],
[
"Li",
"T. F.",
""
],
[
"Im",
"H.",
""
],
[
"Tsai",
"J. S.",
""
]
] |
0707.0733 | Jamil Aslam | M. Ali Paracha, Ishtiaq Ahmed, M. Jamil Aslam | Form factors, branching ratio and forward-backward asymmetry in B ->
K_{1}ell ^{+} ell ^{-} decays | 15 pages, 2 figures | Eur.Phys.J.C52:967-973,2007 | 10.1140/epjc/s10052-007-0422-4 | null | hep-ph | null | We study long-distance effects in rare exclusive semileptonic decays B ->
K_{1}ell ^{+}ell ^{-}, K_{1} is the axial vector meson.The form factors,
describing the meson transition amplitudes of the effective Hamiltonian, are
calculated using Ward identites which are then used to calculate branching
ratio and forward-backward asymmetry in these decay modes. The zero of
forward-backward asymmetry is of special interest and provide us the precission
test of Standard model.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 08:11:09 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Sep 2007 08:27:12 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Paracha",
"M. Ali",
""
],
[
"Ahmed",
"Ishtiaq",
""
],
[
"Aslam",
"M. Jamil",
""
]
] |
0707.0734 | Endre Cs\'aki | Endre Cs\'aki, Ant\'onia F\"oldes, P\'al R\'ev\'esz | Transient NN random walk on the line | 25 pages | null | null | null | math.PR | null | We prove strong theorems for the local time at infinity of a nearest neighbor
transient random walk. First, laws of the iterated logarithm are given for the
large values of the local time. Then we investigate the length of intervals
over which the walk runs through (always from left to right) without ever
returning.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 08:11:15 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Csáki",
"Endre",
""
],
[
"Földes",
"Antónia",
""
],
[
"Révész",
"Pál",
""
]
] |
0707.0735 | Oliver Burmeister | A. Bunkowski, O. Burmeister, T. Clausnitzer, E.-B. Kley, A.
T\"unnermann, K. Danzmann, R. Schnabel | Optical characterization of ultra-high diffraction efficiency gratings | null | Applied Optics Vol. 45, No. 23 5795 (2006) | 10.1364/AO.45.005795 | null | physics.optics | null | We report on the optical characterization of an ultra-high diffraction
efficiency grating in 1st order Littrow configuration. The apparatus used was
an optical cavity built from the grating under investigation and an additional
high reflection mirror. Measurement of the cavity finesse provided precise
information about the grating's diffraction efficiency and its optical loss. We
measured a finesse of 1580 from which we deduced a diffraction efficiency of
(99.635$\pm$0.016)% and an overall optical loss due to scattering and
absorption of just 0.185 %.
Such high quality gratings, including the tool used for their
characterization, might apply for future gravitational wave detectors. For
example the demonstrated cavity itself presents an all-reflective, low-loss
Fabry-Perot resonator that might replace conventional arm cavities in advanced
high power Michelson interferometers.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 08:33:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bunkowski",
"A.",
""
],
[
"Burmeister",
"O.",
""
],
[
"Clausnitzer",
"T.",
""
],
[
"Kley",
"E. -B.",
""
],
[
"Tünnermann",
"A.",
""
],
[
"Danzmann",
"K.",
""
],
[
"Schnabel",
"R.",
""
]
] |
0707.0736 | Jean-Philippe Uzan | Thiago S. Pereira, Cyril Pitrou, Jean-Philippe Uzan | Theory of cosmological perturbations in an anisotropic universe | 33 pages | JCAP0709:006,2007 | 10.1088/1475-7516/2007/09/006 | null | astro-ph gr-qc hep-ph hep-th | null | This article describes the theory of cosmological perturbations around a
homogeneous and anisotropic universe of the Bianchi I type. Starting from a
general parameterisation of the perturbed spacetime a la Bardeen, a complete
set of gauge invariant variables is constructed. Three physical degrees of
freedom are identified and it is shown that, in the case where matter is
described by a scalar field, they generalize the Mukhanov-Sasaki variables. In
order to show that they are canonical variables, the action for the
cosmological perturbations at second order is derived. Two major physical
imprints of the primordial anisotropy are identified: (1) a scalar-tensor
``see-saw'' mechanism arising from the fact that scalar, vector and tensor
modes do not decouple and (2) an explicit dependence of the statistical
properties of the density perturbations and gravity waves on the wave-vector
instead of its norm. This analysis extends, but also sheds some light on, the
quantization procedure that was developed under the assumption of a
Friedmann-Lemaitre background spacetime, and allows to investigate the
robustness of the predictions of the standard inflationary scenario with
respect to the hypothesis on the symmetries of the background spacetime. These
effects of a primordial anisotropy may be related to some anomalies of the
cosmic microwave background anisotropies on large angular scales.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 08:56:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pereira",
"Thiago S.",
""
],
[
"Pitrou",
"Cyril",
""
],
[
"Uzan",
"Jean-Philippe",
""
]
] |
0707.0737 | Victor P. Debattista | Victor P. Debattista, Ben Moore, Thomas Quinn, Stelios Kazantzidis,
Ryan Maas, Lucio Mayer, Justin Read, and Joachim Stadel | The Causes of Halo Shape Changes Induced by Cooling Baryons: Disks
Versus Substructures | 35 pages, 13 figures (3 in color). Accepted to ApJ. This version is
expanded, with new simulations included in response to referee. Conclusions
remain unchanged | null | 10.1086/587977 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cold dark matter cosmogony predicts triaxial dark matter halos, whereas
observations find quite round halos. This is most likely due to the
condensation of baryons leading to rounder halos. We examine the halo phase
space distribution basis for such shape changes. Triaxial halos are supported
by box orbits, which pass arbitrarily close to the density center. The decrease
in triaxiality caused by baryons is thought to be due to the scattering of
these orbits. We test this hypothesis with simulations of disks grown inside
triaxial halos. After the disks are grown we check whether the phase space
structure has changed by evaporating the disks and comparing the initial and
final states. While the halos are substantially rounder when the disk is at
full mass, their final shape after the disk is evaporated is not much different
from the initial. Likewise, the halo becomes (more) radially anisotropic when
the disk is grown, but the final anisotropy is consistent with the initial.
Only if the baryons are unreasonably compact or massive does the halo change
irreversibly. We show that the character of individual orbits is not generally
changed by the growing mass. Thus the central condensation of baryons does not
destroy enough box orbits to cause the shape change. Rather, box orbits merely
become rounder along with the global potential. However, if angular momentum is
transferred to the halo, either via satellites or via bars, a large
irreversible change in the halo distribution occurs. The ability of satellites
to alter the phase space distribution of the halo is of particular concern to
galaxy formation simulations since halo triaxiality can profoundly influence
the evolution of disks.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 08:53:22 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jun 2008 01:18:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Debattista",
"Victor P.",
""
],
[
"Moore",
"Ben",
""
],
[
"Quinn",
"Thomas",
""
],
[
"Kazantzidis",
"Stelios",
""
],
[
"Maas",
"Ryan",
""
],
[
"Mayer",
"Lucio",
""
],
[
"Read",
"Justin",
""
],
[
"Stadel",
"Joachim",
""
]
] |
0707.0738 | Erwan Lanneau | Pascal Hubert, Erwan Lanneau, Martin Moeller | Completely periodic directions and orbit closures of many pseudo-Anosov
Teichmueller discs in Q(1,1,1,1) | 38 pages, submitted | null | null | null | math.GT math.DS | null | In this paper, we investigate the closure of a large class of Teichm\"uller
discs in the stratum Q(1,1,1,1) or equivalently, in a GL^+_2(R)-invariant locus
L of translation surfaces of genus three. We describe a systematic way to prove
that the GL^+_2(R)-orbit closure of a translation surface in L is the whole of
L. The strategy of the proof is an analysis of completely periodic directions
on such a surface and an iterated application of Ratner's theorem to unipotent
subgroups acting on an ``adequate'' splitting. This analysis applies for
example to all Teichmueller discs stabilized obtained by Thurston's
construction with a trace field of degree three which moreover ``obviously not
Veech''. We produce an infinite series of such examples and show moreover that
the favourable splitting situation does not arise everywhere on L, contrary to
the situation in genus two. We also study completely periodic directions on
translation surfaces in L. For instance, we prove that completely periodic
directions are dense on surfaces obtained by Thurston's construction.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 17:44:01 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Hubert",
"Pascal",
""
],
[
"Lanneau",
"Erwan",
""
],
[
"Moeller",
"Martin",
""
]
] |
0707.0739 | Christopher Allan Watson | C. A. Watson, D. Steeghs, T. Shahbaz, V. S. Dhillon | Roche tomography of cataclysmic variables - IV. Starspots and slingshot
prominences on BV Cen | 16 pages, 13 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12173.x | null | astro-ph | null | We present Roche tomograms of the G5-G8 IV/V secondary star in the
long-period cataclysmic variable BV Cen reconstructed from MIKE echelle data
taken on the Magellan Clay 6.5-m telescope. The tomograms show the presence of
a number of large, cool starspots on BV Cen for the first time. In particular,
we find a large high-latitude spot which is deflected from the rotational axis
in the same direction as seen on the K3-K5 IV/V secondary star in the
cataclysmic variable AE Aqr. BV Cen also shows a similar relative paucity of
spots at latitudes between 40-50 degrees when compared with AE Aqr.
Furthermore, we find evidence for an increased spot coverage around longitudes
facing the white dwarf which supports models invoking starspots at the L1 point
to explain the low-states observed in some cataclysmic variables. In total, we
estimate that some 25 per cent of the northern hemisphere of BV Cen is spotted.
We also find evidence for a faint, narrow, transient emission line with
characteristics reminiscent of the peculiar low-velocity emission features
observed in some outbursting dwarf novae. We interpret this feature as a
slingshot prominence from the secondary star and derive a maximum source size
of 75,000 km and a minimum altitude of 160,000 km above the orbital plane for
the prominence.
The entropy landscape technique was applied to determine the system
parameters of BV Cen. We find M_1 = 1.18 (+0.28 -0.16) Msolar, M_2 = 1.05
(+0.23 -0.14) Msolar and an orbital inclination of i = 53 degrees +- 4 degrees
at an optimal systemic velocity of \gamma = -22.3 km s-1. Finally, we also
report on the previously unknown binarity of the G5IV star HD 220492.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:06:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Watson",
"C. A.",
""
],
[
"Steeghs",
"D.",
""
],
[
"Shahbaz",
"T.",
""
],
[
"Dhillon",
"V. S.",
""
]
] |
0707.0740 | Richard McClatchey | A. Ali, A. Anjum, J. Bunn, F. Khan, R.McClatchey, H. Newman, C.
Steenberg, M. Thomas, Ian Willers | A Multi Interface Grid Discovery System | 2 pages, 4 figures. Presented at the Grid 2006 conference, Barcelona
Spain | null | null | null | cs.DC | null | Discovery Systems (DS) can be considered as entry points for global loosely
coupled distributed systems. An efficient Discovery System in essence increases
the performance, reliability and decision making capability of distributed
systems. With the rapid increase in scale of distributed applications, existing
solutions for discovery systems are fast becoming either obsolete or incapable
of handling such complexity. They are particularly ineffective when handling
service lifetimes and providing up-to-date information, poor at enabling
dynamic service access and they can also impose unwanted restrictions on
interfaces to widely available information repositories. In this paper we
present essential the design characteristics, an implementation and a
performance analysis for a discovery system capable of overcoming these
deficiencies in large, globally distributed environments.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:22:45 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Ali",
"A.",
""
],
[
"Anjum",
"A.",
""
],
[
"Bunn",
"J.",
""
],
[
"Khan",
"F.",
""
],
[
"McClatchey",
"R.",
""
],
[
"Newman",
"H.",
""
],
[
"Steenberg",
"C.",
""
],
[
"Thomas",
"M.",
""
],
[
"Willers",
"Ian",
""
]
] |
0707.0741 | Hagai B. Perets | Hagai B. Perets, Yoav Lahini, Francesca Pozzi, Marc Sorel, Roberto
Morandotti, Yaron Silberberg | Realization of quantum walks with negligible decoherence in waveguide
lattices | 4 pages, 3 figures. Added subfigure. Accepted to PRL | Phys. Rev. Lett. 100, 170506 (2008) | 10.1103/PhysRevLett.100.170506 | null | quant-ph cond-mat.other physics.optics | null | Quantum random walks are the quantum counterpart of classical random walks,
and were recently studied in the context of quantum computation. A quantum
random walker is subject to self interference, leading to a remarkably
different behavior than that of classical random walks such as ballistic
propagation or localization due to disorder. Physical implementations of
quantum walks have only been made in very small scale systems severely limited
by decoherence. Here we show that the propagation of photons in waveguide
lattices, which have been studied extensively in recent years, are essentially
an implementation of quantum walks. Since waveguide lattices are easily
constructed at large scales and display negligible decoherence, they can serve
as an ideal and versatile experimental playground for the study of quantum
walks and quantum algorithms. We experimentally observe quantum walks in large
systems (~100 sites) and confirm quantum walks effects which were studied
theoretically, including ballistic propagation, disorder and boundary related
effects.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:49:52 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 05:49:47 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Sep 2007 08:34:44 GMT"
},
{
"version": "v4",
"created": "Thu, 10 Apr 2008 11:17:04 GMT"
}
] | 2008-05-19T00:00:00 | [
[
"Perets",
"Hagai B.",
""
],
[
"Lahini",
"Yoav",
""
],
[
"Pozzi",
"Francesca",
""
],
[
"Sorel",
"Marc",
""
],
[
"Morandotti",
"Roberto",
""
],
[
"Silberberg",
"Yaron",
""
]
] |
0707.0742 | Richard McClatchey | A. Ali, A. Anjum, T. Azim, J. Bunn, A. Ikram, R. McClatchey, H.
Newman, C. Steenberg, M. Thomas, I. Willers | Mobile Computing in Physics Analysis - An Indicator for eScience | 8 pages, 7 figures. Presented at the 3rd Int Conf on Mobile Computing
& Ubiquitous Networking (ICMU06. London October 2006 | null | null | null | cs.DC | null | This paper presents the design and implementation of a Grid-enabled physics
analysis environment for handheld and other resource-limited computing devices
as one example of the use of mobile devices in eScience. Handheld devices offer
great potential because they provide ubiquitous access to data and
round-the-clock connectivity over wireless links. Our solution aims to provide
users of handheld devices the capability to launch heavy computational tasks on
computational and data Grids, monitor the jobs status during execution, and
retrieve results after job completion. Users carry their jobs on their handheld
devices in the form of executables (and associated libraries). Users can
transparently view the status of their jobs and get back their outputs without
having to know where they are being executed. In this way, our system is able
to act as a high-throughput computing environment where devices ranging from
powerful desktop machines to small handhelds can employ the power of the Grid.
The results shown in this paper are readily applicable to the wider eScience
community.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:32:29 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Ali",
"A.",
""
],
[
"Anjum",
"A.",
""
],
[
"Azim",
"T.",
""
],
[
"Bunn",
"J.",
""
],
[
"Ikram",
"A.",
""
],
[
"McClatchey",
"R.",
""
],
[
"Newman",
"H.",
""
],
[
"Steenberg",
"C.",
""
],
[
"Thomas",
"M.",
""
],
[
"Willers",
"I.",
""
]
] |
0707.0743 | Richard McClatchey | A. Anjum, R. McClatchey, H. Stockinger, A. Ali, I. Willers, M. Thomas,
M. Sagheer, K. Hasham, O. Alvi | DIANA Scheduling Hierarchies for Optimizing Bulk Job Scheduling | 8 pages, 9 figures. Presented at the 2nd IEEE Int Conference on
eScience & Grid Computing. Amsterdam Netherlands, December 2006 | null | 10.1109/E-SCIENCE.2006.261173 | null | cs.DC | null | The use of meta-schedulers for resource management in large-scale distributed
systems often leads to a hierarchy of schedulers. In this paper, we discuss why
existing meta-scheduling hierarchies are sometimes not sufficient for Grid
systems due to their inability to re-organise jobs already scheduled locally.
Such a job re-organisation is required to adapt to evolving loads which are
common in heavily used Grid infrastructures. We propose a peer-to-peer
scheduling model and evaluate it using case studies and mathematical modelling.
We detail the DIANA (Data Intensive and Network Aware) scheduling algorithm and
its queue management system for coping with the load distribution and for
supporting bulk job scheduling. We demonstrate that such a system is beneficial
for dynamic, distributed and self-organizing resource management and can assist
in optimizing load or job distribution in complex Grid infrastructures.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:36:18 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Anjum",
"A.",
""
],
[
"McClatchey",
"R.",
""
],
[
"Stockinger",
"H.",
""
],
[
"Ali",
"A.",
""
],
[
"Willers",
"I.",
""
],
[
"Thomas",
"M.",
""
],
[
"Sagheer",
"M.",
""
],
[
"Hasham",
"K.",
""
],
[
"Alvi",
"O.",
""
]
] |
0707.0744 | Inge Bethke | Jan Bergstra, Inge Bethke and Mark Burgess | A process algebra based framework for promise theory | 9 pages, 4 figures | null | null | PRG0701 | cs.LO | null | We present a process algebra based approach to formalize the interactions of
computing devices such as the representation of policies and the resolution of
conflicts. As an example we specify how promises may be used in coming to an
agreement regarding a simple though practical transportation problem.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:39:14 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Bergstra",
"Jan",
""
],
[
"Bethke",
"Inge",
""
],
[
"Burgess",
"Mark",
""
]
] |
0707.0745 | Richard McClatchey | K. Munir, M. Odeh, R. McClatchey, S. Khan, I. Habib | Semantic Information Retrieval from Distributed Heterogeneous Data
Sources | 6 pages, 3 figures. Presented at the 4th International Workshop on
Frontiers of Information Technology -- FIT 2006. Islamabad, Pakistan December
2006 | null | null | null | cs.DB | null | Information retrieval from distributed heterogeneous data sources remains a
challenging issue. As the number of data sources increases more intelligent
retrieval techniques, focusing on information content and semantics, are
required. Currently ontologies are being widely used for managing semantic
knowledge, especially in the field of bioinformatics. In this paper we describe
an ontology assisted system that allows users to query distributed
heterogeneous data sources by hiding details like location, information
structure, access pattern and semantic structure of the data. Our goal is to
provide an integrated view on biomedical information sources for the
Health-e-Child project with the aim to overcome the lack of sufficient
semantic-based reformulation techniques for querying distributed data sources.
In particular, this paper examines the problem of query reformulation across
biomedical data sources, based on merged ontologies and the underlying
heterogeneous descriptions of the respective data sources.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:40:19 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Munir",
"K.",
""
],
[
"Odeh",
"M.",
""
],
[
"McClatchey",
"R.",
""
],
[
"Khan",
"S.",
""
],
[
"Habib",
"I.",
""
]
] |
0707.0746 | Casey Israel | C. Israel, M. J. Calder\'on and N. D. Mathur | The current spin on manganites | invited review for Materials Today (October 2007 issue), 18 pages, 8
figures | Materials Today 10, 24 (2007) | null | null | cond-mat.mtrl-sci | null | In a material, the existence and coexistence of phases with very different
magnetic and electronic properties is both unusual and surprising. Manganites
in particular capture the imagination because they demonstrate a complexity
that belies their chemically single-phase nature. This complexity arises
because the magnetic, electronic and crystal structures interact with one
another to deliver exotic magnetic and electronic phases that coexist. This
coexistence is self-organized and yet readily susceptible to external
perturbations, permitting subtle and imaginative experiments of the type that
we describe here. Moreover, these experiments reveal that each competing phase
itself remains an incompletely solved mystery.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 09:55:29 GMT"
}
] | 2008-01-29T00:00:00 | [
[
"Israel",
"C.",
""
],
[
"Calderón",
"M. J.",
""
],
[
"Mathur",
"N. D.",
""
]
] |
0707.0747 | Stefan Forste | Stefan Forste, Cristina Timirgaziu, Ivonne Zavala | Orientifold's Landscape: Non-Factorisable Six-Tori | 24 pages, one figure, v2: references added, v3: small proof added in
footnote 5, minor changes, to appear in JHEP | JHEP 0710:025,2007 | 10.1088/1126-6708/2007/10/025 | LTH 748, IPPP/07/37, DCPT/07/74 | hep-th hep-ph | null | We construct type IIA orientifolds on T6/(Z2 x Z2) which admit non
factorisable lattices. We describe a method to deal with this kind of
configurations and discuss how the compactification lattice affects the tadpole
cancellation conditions. Moreover, we include D6-branes which are not parallel
to O6-planes. These branes can give rise to chiral spectra in four dimensions,
thus uncovering a new corner in the landscape of intersecting D-brane model
constructions. We demonstrate the construction at an explicit example. In
general we argue that obtaining an odd number of families is problematic.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:16:14 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 17:35:43 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 11:18:07 GMT"
}
] | 2010-02-03T00:00:00 | [
[
"Forste",
"Stefan",
""
],
[
"Timirgaziu",
"Cristina",
""
],
[
"Zavala",
"Ivonne",
""
]
] |
0707.0748 | Richard McClatchey | F. Estrella, T. Hauer, R. McClatchey, M. Odeh, D Rogulin, T.
Solomonides | Experiences of Engineering Grid-Based Medical Software | 18 pages, 2 tables, 5 figures. In press International Journal of
Medical Informatics. Elsevier publishers | null | null | null | cs.DC | null | Objectives: Grid-based technologies are emerging as potential solutions for
managing and collaborating distributed resources in the biomedical domain. Few
examples exist, however, of successful implementations of Grid-enabled medical
systems and even fewer have been deployed for evaluation in practice. The
objective of this paper is to evaluate the use in clinical practice of a
Grid-based imaging prototype and to establish directions for engineering future
medical Grid developments and their subsequent deployment. Method: The
MammoGrid project has deployed a prototype system for clinicians using the Grid
as its information infrastructure. To assist in the specification of the system
requirements (and for the first time in healthgrid applications), use-case
modelling has been carried out in close collaboration with clinicians and
radiologists who had no prior experience of this modelling technique. A
critical qualitative and, where possible, quantitative analysis of the
MammoGrid prototype is presented leading to a set of recommendations from the
delivery of the first deployed Grid-based medical imaging application. Results:
We report critically on the application of software engineering techniques in
the specification and implementation of the MammoGrid project and show that
use-case modelling is a suitable vehicle for representing medical requirements
and for communicating effectively with the clinical community. This paper also
discusses the practical advantages and limitations of applying the Grid to
real-life clinical applications and presents the consequent lessons learned.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:06:41 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Estrella",
"F.",
""
],
[
"Hauer",
"T.",
""
],
[
"McClatchey",
"R.",
""
],
[
"Odeh",
"M.",
""
],
[
"Rogulin",
"D",
""
],
[
"Solomonides",
"T.",
""
]
] |
0707.0749 | Efim Zasavitsky | P.G. Globa, E.A.Zasavitsky, V.G.Kantser, S.P.Sidelinikova, A.I.Dikusar | Kinetics of Electrodeposition of Silver and Copper at Template Synthesis
of Nanowires | 6 pages, 7 figures | null | null | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The results of investigation of kinetics of nanopores filling into membranes
from aluminum oxide (pore diameter - 200 nm, porosity ~ 50%) at
electrodeposition of copper and silver are described. It is shown, that at
identical quantity of electricity passed through solutions, the degree of pores
filling by metal (average thickness of a deposit) is various for copper and
silver deposition. Calculated (according Faraday Law) and experimental
dependences of deposition rates of these metals on quantity of electricity
passed at direct and pulse currents are presented. Galvanodynamic i - v
dependences have been obtained at various current scanning rates. The smaller
rate of deposition allows to decrease concentration limitations of electrode
process and to obtain higher average thickness of metal deposits and higher
filling degree. The limiting values of quantity of electricity for direct and
pulse currents were determined. The average thickness of silver and copper
deposits was obtained. A degree of pores filling, the morphology and chemical
microanalysis were studied on cross-section of the membrane, using TESCAN SEM
equipped with an Oxford Instruments INCA Enerqy EDX-system.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:08:41 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Globa",
"P. G.",
""
],
[
"Zasavitsky",
"E. A.",
""
],
[
"Kantser",
"V. G.",
""
],
[
"Sidelinikova",
"S. P.",
""
],
[
"Dikusar",
"A. I.",
""
]
] |
0707.0750 | Garry Pantelis | Garry Pantelis | Nonlinear PDEs and Scale Dependence | typo corrected | null | null | null | math.AP math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of nonlinear PDEs that generate filtered solutions are
explored with particular attention given to the constraints on the residual
term. The analysis is carried out for nonlinear PDEs with an emphasis on
evolution problems recast on space-time-scale. We examine the role of
approximation that allow for the generation of solutions on isolated scale
slices.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:13:44 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 12:40:22 GMT"
},
{
"version": "v3",
"created": "Sat, 24 Apr 2010 17:47:24 GMT"
}
] | 2010-04-27T00:00:00 | [
[
"Pantelis",
"Garry",
""
]
] |
0707.0751 | Federico Corberi | Federico Corberi, Eugenio Lippiello and Marco Zannetti | Fluctuation-Dissipation relations far from Equilibrium | 18 pages, 10 figures | J. Stat. Mech. (2007) P07002 | 10.1088/1742-5468/2007/07/P07002 | null | cond-mat.stat-mech | null | In this Article we review some recent progresses in the field of
non-equilibrium linear response theory. We show how a generalization of the
fluctuation-dissipation theorem can be derived for Markov processes, and
discuss the Cugliandolo-Kurchan \cite{Cugliandolo93} fluctuation dissipation
relation for aging systems and the theorem by Franz {\it et. al.}
\cite{Franz98} relating static and dynamic properties. We than specialize the
subject to phase-ordering systems examining the scaling properties of the
linear response function and how these are determined by the behavior of
topological defects. We discuss how the connection between statics and dynamics
can be violated in these systems at the lower critical dimension or as due to
stochastic instability.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:16:05 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Corberi",
"Federico",
""
],
[
"Lippiello",
"Eugenio",
""
],
[
"Zannetti",
"Marco",
""
]
] |
0707.0752 | Etienne Gindensperger | Etienne Gindensperger and Lorenz S. Cederbaum | Quantum dynamics in macrosystems with several coupled electronic states:
hierarchy of effective Hamiltonians | null | null | 10.1063/1.2778682 | null | physics.chem-ph | null | We address the nonadiabatic quantum dynamics of macrosystems with several
coupled electronic states, taking into account the possibility of multi-state
conical intersections. The general situation of an arbitrary number of states
and arbitrary number of nuclear degrees of freedom (modes) is considered. The
macrosystem is decomposed into a system part carrying a few, strongly coupled
modes, and an environment, comprising the vast number of remaining modes. By
successively transforming the modes of the environment, a hierarchy of
effective Hamiltonians for the environment is constructed. Each effective
Hamiltonian depends on a reduced number of effective modes, which carry
cumulative effects. By considering the system's Hamiltonian along with a few
members of the hierarchy, it is shown mathematically by a moment analysis that
the quantum dynamics of the entire macrosystem can be numerically exactly
computed on a given time-scale. The time scale wanted defines the number of
effective Hamiltonians to be included. The contribution of the environment to
the quantum dynamics of the macrosystem translates into a sequential coupling
of effective modes. The wavefunction of the macrosystem is known in the full
space of modes, allowing for the evaluation of observables such as the
time-dependent individual excitation along modes of interest, as well a spectra
and electronic-population dynamics.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:19:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gindensperger",
"Etienne",
""
],
[
"Cederbaum",
"Lorenz S.",
""
]
] |
0707.0753 | A. L. Kuzemsky | A. L. Kuzemsky | Theory of Transport Processes and the Method of the Nonequilibrium
Statistical Operator | This submission has been removed by arXiv admin because the files
submitted were incomplete | Intern. J. Modern Phys. B21, Issue 17 (10 July) (2007), pp.1-129 | 10.1142/S0217979207037417 | null | cond-mat.stat-mech | null | The aim of this review is to provide better understanding of a few approaches
that have been proposed for treating nonequilibrium (time-dependent) processes
in statistical mechanics with the emphasis on the inter-relation between
theories. The ensemble method, as it was formulated by J. W. Gibbs, have the
great generality and the broad applicability to equilibrium statistical
mechanics. Different macroscopic environmental constraints lead to different
types of ensembles, with particular statistical characteristics. In the present
work, the statistical theory of nonequilibrium processes which is based on
nonequilibrium ensemble formalism is discussed. The kinetic approach to dynamic
many-body problems, which is important from the point of view of the
fundamental theory of irreversibility, is alluded to. The emphasis is on the
method of the nonequilibrium statistical operator (NSO) developed by D. N.
Zubarev. The NSO method permits one to generalize the Gibbs ensemble method to
the nonequilibrium case and to construct a nonequilibrium statistical operator
which enables one to obtain the transport equations and calculate the transport
coefficients in terms of correlation functions, and which, in the case of
equilibrium, goes over to the Gibbs distribution. Although some space is
devoted to the formal structure of the NSO method, the emphasis is on its
utility. Applications to specific problems such as the generalized transport
and kinetic equations, and a few examples of the relaxation and dissipative
processes, which manifest the operational ability of the method, are
considered.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:20:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuzemsky",
"A. L.",
""
]
] |
0707.0754 | Denis Semenov A. | Denis A. Semenov | The Symmetry of the Genetic Code and a Universal Trend of Amino Acid
Gain and Loss | 7 pages, 3 tables | null | null | null | q-bio.PE | null | Part 1 of the study intends to show that the universal trend of amino acid
gain and loss discovered by Jordan et al. (2005) can be accounted for by the
spontaneity of DNA typical damages. These damages lead to replacements of
guanine and cytosine by thymine. Part 2 proposes a hypothesis of the evolution
of the genetic code, the leading mechanism of which is the nucleotide
spontaneous damage. The hypothesis accounts for the universal trend of amino
acid gain and loss, stability of the genetic code towards point mutations, the
presence of code dialects, and the symmetry of the genetic code table.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:29:00 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Semenov",
"Denis A.",
""
]
] |
0707.0755 | Zahera Jabeen | Zahera Jabeen (IITM) and Neelima Gupte (IITM) | A cellular automaton identification of the universality classes of
spatiotemporal intermittency | 11 pages, 6 figures | null | null | null | nlin.CD | null | The phase diagram of the coupled sine circle map lattice shows
spatio-temporal intermittency of two distinct types: spatio-temporal
intermittency of the directed percolation (DP) class, and spatial intermittency
which does not belong to this class. These two types of behaviour are seen to
be special cases of the spreading and non-spreading regimes seen in the system.
In the spreading regime, each site can infect its neighbours permitting an
initial disturbance to spread, whereas in the non-spreading regime no infection
is possible. The two regimes are separated by a line which we call the
infection line. The coupled map lattice can be mapped on to an equivalent
cellular automaton which shows a transition from a probabilistic cellular
automaton (PCA) to a deterministic cellular automaton (DCA) at the infection
line. Thus the existence of the DP and non-DP universality classes in the same
system is signalled by the PCA to DCA transition. We also discuss the dynamic
origin of this transition.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:35:28 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Jabeen",
"Zahera",
"",
"IITM"
],
[
"Gupte",
"Neelima",
"",
"IITM"
]
] |
0707.0756 | Naomichi Hatano | Ernesto Estrada and Naomichi Hatano | Communicability in complex networks | 20 pages, 5 figures | Phys. Rev. E 77, 036111 (2008) | 10.1103/PhysRevE.77.036111 | null | physics.soc-ph cond-mat.stat-mech | null | Many topological and dynamical properties of complex networks are defined by
assuming that most of the transport on the network flows along the shortest
paths. However, there are different scenarios in which non-shortest paths are
used to reach the network destination. Thus the consideration of the shortest
paths only does not account for the global communicability of a complex
network. Here we propose a new measure of the communicability of a complex
network, which is a broad generalization of the concept of the shortest path.
According to the new measure, most of real-world networks display the largest
communicability between the most connected (popular) nodes of the network
(assortative communicability). There are also several networks with the
disassortative communicability, where the most "popular" nodes communicate very
poorly to each other. Using this information we classify a diverse set of
real-world complex systems into a small number of universality classes based on
their structure-dynamic correlation. In addition, the new communicability
measure is able to distinguish finer structures of networks, such as
communities into which a network is divided. A community is unambiguously
defined here as a set of nodes displaying larger communicability among them
than to the rest of nodes in the network.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:40:05 GMT"
}
] | 2008-12-16T00:00:00 | [
[
"Estrada",
"Ernesto",
""
],
[
"Hatano",
"Naomichi",
""
]
] |
0707.0757 | Thomas Krajewski | J.-H. Jureit, T. Krajewski | Quasi-quantum groups from strings | 10 pages, 8 figures, talk given at the conference "Noncommutative
Geometry and Physics", Orsay April 2007 | J.Phys.Conf.Ser.103:012005,2008 | 10.1088/1742-6596/103/1/012005 | CPT-P31-2007 | hep-th | null | Motivated by string theory on the orbifold ${\cal M}/G$ in presence of a
Kalb-Ramond field strength $H$, we define the operators that lift the group
action to the twisted sectors. These operators turn out to generate the
quasi-quantum group $D_{\omega}[G]$, introduced in the context of conformal
field theory by R. Dijkgraaf, V. Pasquier and P. Roche, with $\omega$ a
3-cocycle determined by a series of cohomological equations in a tricomplex
combining de Rham, \u{C}ech and group cohomologies. We further illustrate some
properties of the quasi-quantum group from a string theoretical point of view.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:52:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jureit",
"J. -H.",
""
],
[
"Krajewski",
"T.",
""
]
] |
0707.0758 | Ram\'on Oliver | M. Luna, J. Terradas, R. Oliver, J.L. Ballester | Transverse oscillations of two coronal loops | Accepted for publication in The Astrophysical Journal | null | 10.1086/528367 | null | astro-ph | null | We study transverse fast magnetohydrodynamic waves in a system of two coronal
loops modeled as smoothed, dense plasma cylinders in a uniform magnetic field.
The collective oscillatory properties of the system due to the interaction
between the individual loops are investigated from two points of view. Firstly,
the frequency and spatial structure of the normal modes are studied. The system
supports four trapped normal modes in which the loops move rigidly in the
transverse direction. The direction of the motions is either parallel or
perpendicular to the plane containing the axes of the loops. Two of these modes
correspond to oscillations of the loops in phase, while in the other two they
move in antiphase. Thus, these solutions are the generalization of the kink
mode of a single cylinder to the double cylinder case. Secondly, we analyze the
time-dependent problem of the excitation of the pair of tubes. We find that
depending on the shape and location of the initial disturbance, different
normal modes can be excited. The frequencies of normal modes are accurately
recovered from the numerical simulations. In some cases, because of the
simultaneous excitation of several eigenmodes, the system shows beating and the
phase lag between the loops is $\pi/2$.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 10:57:58 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Dec 2007 11:15:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Luna",
"M.",
""
],
[
"Terradas",
"J.",
""
],
[
"Oliver",
"R.",
""
],
[
"Ballester",
"J. L.",
""
]
] |
0707.0759 | Andrzej Grudka | Andrzej Grudka and Joanna Modlawska | Optimal state in the Knill-Laflamme-Milburn scheme of linear optical
teleportation | 4 pages | Phys. Rev. A 77, 014301 (2008) | 10.1103/PhysRevA.77.014301 | null | quant-ph | null | We discuss some properties of the Knill-Laflamme-Milburn scheme for quantum
teleportation with both maximally and nonmaximally entangled states. We derive
the error correction scheme when one performs teleportation with nonmaximally
entangled states and we find the probability for perfect teleportation. We show
that the maximally entangled state is optimal in such a case. We also show how
the error correction scheme can be implemented experimentally when one uses
polarization encoding.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:02:31 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Dec 2007 18:20:32 GMT"
}
] | 2008-07-24T00:00:00 | [
[
"Grudka",
"Andrzej",
""
],
[
"Modlawska",
"Joanna",
""
]
] |
0707.0760 | Javier Negro | P. G. Estevez, S. Kuru, J. Negro and L. M. Nieto | Travelling wave solutions of the generalized Benjamin-Bona-Mahony
equation | 19 pages. To appear in CS&F | null | null | null | nlin.SI | null | A class of particular travelling wave solutions of the generalized
Benjamin-Bona-Mahony equation is studied systematically using the factorization
technique. Then, the general travelling wave solutions of Benjamin-Bona-Mahony
equation, and of its modified version, are also recovered.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:30:29 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 15:09:08 GMT"
}
] | 2007-09-17T00:00:00 | [
[
"Estevez",
"P. G.",
""
],
[
"Kuru",
"S.",
""
],
[
"Negro",
"J.",
""
],
[
"Nieto",
"L. M.",
""
]
] |
0707.0761 | Richard McClatchey | David Manset, Herve Verjus, Richard McClatchey | Managing Separation of Concerns in Grid Applications Through
Architectural Model Transformations | 4 pages, 2 figures. Presented at the First European Conference on
Software Architectures (ECSA 2007). Madrid, Spain September 24-26, 2007 | null | null | null | cs.SE cs.DC | null | Grids enable the aggregation, virtualization and sharing of massive
heterogeneous and geographically dispersed resources, using files, applications
and storage devices, to solve computation and data intensive problems, across
institutions and countries via temporary collaborations called virtual
organizations (VO). Most implementations result in complex superposition of
software layers, often delivering low quality of service and quality of
applications. As a consequence, Grid-based applications design and development
is increasingly complex, and the use of most classical engineering practices is
unsuccessful. Not only is the development of such applications a
time-consuming, error prone and expensive task, but also the resulting
applications are often hard-coded for specific Grid configurations, platforms
and infra-structures. Having neither guidelines nor rules in the design of a
Grid-based application is a paradox since there are many existing architectural
approaches for distributed computing, which could ease and promote rigorous
engineering methods based on the re-use of software components. It is our
belief that ad-hoc and semi-formal engineer-ing approaches, in current use, are
insufficient to tackle tomorrows Grid develop-ments requirements. Because
Grid-based applications address multi-disciplinary and complex domains (health,
military, scientific computation), their engineering requires rigor and
control. This paper therefore advocates a formal model-driven engineering
process and corresponding design framework and tools for building the next
generation of Grids.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:10:03 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Manset",
"David",
""
],
[
"Verjus",
"Herve",
""
],
[
"McClatchey",
"Richard",
""
]
] |
0707.0762 | Richard McClatchey | Irfan Habib, Kamran Soomro, Ashiq Anjum, Richard McClatchey, Arshad
Ali, Peter Bloodsworth | PhantomOS: A Next Generation Grid Operating System | 8 pages, 6 figures. Presented at the UK eScience All Hands Meeting
2007 (AHM07). Nottingham, UK. September 2007 | null | null | null | cs.DC | null | Grid Computing has made substantial advances in the past decade; these are
primarily due to the adoption of standardized Grid middleware. However Grid
computing has not yet become pervasive because of some barriers that we believe
have been caused by the adoption of middleware centric approaches. These
barriers include: scant support for major types of applications such as
interactive applications; lack of flexible, autonomic and scalable Grid
architectures; lack of plug-and-play Grid computing and, most importantly, no
straightforward way to setup and administer Grids. PhantomOS is a project which
aims to address many of these barriers. Its goal is the creation of a user
friendly pervasive Grid computing platform that facilitates the rapid
deployment and easy maintenance of Grids whilst providing support for major
types of applications on Grids of almost any topology. In this paper we present
the detailed system architecture and an overview of its implementation.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:14:45 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Habib",
"Irfan",
""
],
[
"Soomro",
"Kamran",
""
],
[
"Anjum",
"Ashiq",
""
],
[
"McClatchey",
"Richard",
""
],
[
"Ali",
"Arshad",
""
],
[
"Bloodsworth",
"Peter",
""
]
] |
0707.0763 | Richard McClatchey | Ashiq Anjum, Peter Bloodsworth, Andrew Branson, Tamas Hauer, Richard
McClatchey, Kamran Munir, Dmitry Rogulin, Jetendr Shamdasani | The Requirements for Ontologies in Medical Data Integration: A Case
Study | 6 pages, 1 figure. Presented at the 11th International Database
Engineering & Applications Symposium (Ideas2007). Banff, Canada September
2007 | null | null | null | cs.DB | null | Evidence-based medicine is critically dependent on three sources of
information: a medical knowledge base, the patients medical record and
knowledge of available resources, including where appropriate, clinical
protocols. Patient data is often scattered in a variety of databases and may,
in a distributed model, be held across several disparate repositories.
Consequently addressing the needs of an evidence-based medicine community
presents issues of biomedical data integration, clinical interpretation and
knowledge management. This paper outlines how the Health-e-Child project has
approached the challenge of requirements specification for (bio-) medical data
integration, from the level of cellular data, through disease to that of
patient and population. The approach is illuminated through the requirements
elicitation and analysis of Juvenile Idiopathic Arthritis (JIA), one of three
diseases being studied in the EC-funded Health-e-Child project.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:21:39 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Anjum",
"Ashiq",
""
],
[
"Bloodsworth",
"Peter",
""
],
[
"Branson",
"Andrew",
""
],
[
"Hauer",
"Tamas",
""
],
[
"McClatchey",
"Richard",
""
],
[
"Munir",
"Kamran",
""
],
[
"Rogulin",
"Dmitry",
""
],
[
"Shamdasani",
"Jetendr",
""
]
] |
0707.0764 | Branko Dragovich | Branko Dragovich and Alexandra Dragovich | p-Adic Degeneracy of the Genetic Code | 11 pages, 1 table. Published in the Proceedings of '4th Summer School
in Modern Mathematcal Physics', September 2006, Belgrade (Serbia) | SFIN XX A1 (2007) 179-188 | null | null | q-bio.GN cs.IT math.IT physics.bio-ph | null | Degeneracy of the genetic code is a biological way to minimize effects of the
undesirable mutation changes. Degeneration has a natural description on the
5-adic space of 64 codons $\mathcal{C}_5 (64) = \{n_0 + n_1 5 + n_2 5^2
: n_i = 1, 2, 3, 4 \} ,$ where $n_i$ are digits related to nucleotides as
follows: C = 1, A = 2, T = U = 3, G = 4. The smallest 5-adic distance between
codons joins them into 16 quadruplets, which under 2-adic distance decay into
32 doublets. p-Adically close codons are assigned to one of 20 amino acids,
which are building blocks of proteins, or code termination of protein
synthesis. We shown that genetic code multiplets are made of the p-adic nearest
codons.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:40:53 GMT"
}
] | 2007-07-16T00:00:00 | [
[
"Dragovich",
"Branko",
""
],
[
"Dragovich",
"Alexandra",
""
]
] |
0707.0765 | Ugo Tartaglino | Xiao-Hua Zhang, Ugo Tartaglino, Giuseppe E. Santoro, Erio Tosatti | Velocity plateaus and jumps in carbon nanotube sliding | 9 pages, 5 color figures, format latex Elsart. Surface Science, in
press, http://dx.doi.org/10.1016/j.susc.2007.05.034 | Surface Science 601, 3693-3696 (2007) | 10.1016/j.susc.2007.05.034 | null | cond-mat.mtrl-sci | null | The friction between concentric carbon nanotubes sliding one inside the other
has been widely studied and simulated, but not so far using external force as
the driving variable. Our molecular dynamics (MD) simulations show that as the
pulling force grows, the sliding velocity increases by jumps and plateaus
rather than continuously as expected. Dramatic friction peaks (similar to that
recently noted by Tangney {\it et al.} in Phys. Rev. Lett. 97 (2006) 195901)
which develop around some preferential sliding velocities, are at the origin of
this phenomenon. The (stable) rising edge of the peak produces a velocity
plateau; the (unstable) dropping edge produces a jump to the nearest stable
branch. The outcome is reminiscent of conduction in ionized gases, the plateau
correspon ding to a current stabilization against voltage variations, the jump
corresponding to a discharge or breakdown.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:42:17 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Zhang",
"Xiao-Hua",
""
],
[
"Tartaglino",
"Ugo",
""
],
[
"Santoro",
"Giuseppe E.",
""
],
[
"Tosatti",
"Erio",
""
]
] |
0707.0766 | Leo Stodolsky | I. Bavykina, P.Christ, P.Huff, J.Ninkovic, F.Proebst, W.Seidel, and L.
Stodolsky | Interpretation of Light-Quenching Factor Measurements | Seven pages, seven figures, some with color | Astropart.Phys.28:489-493,2007 | 10.1016/j.astropartphys.2007.09.006 | null | physics.ins-det | null | We observe that the pattern of the quenching factors for scintillation light
from various ions, recently studied in $CaWO_4$ in connection with dark matter
detectors, can be understood as a saturation phenomenon in which the light
output is simply proportional to track length, independent of the ion and its
energy. This observation is in accord with the high dE/dx limit of Birks' law.
It suggests a simple model for the intrinsic resolution of light detectors for
low energy ions, which we briefly discuss.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 11:54:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bavykina",
"I.",
""
],
[
"Christ",
"P.",
""
],
[
"Huff",
"P.",
""
],
[
"Ninkovic",
"J.",
""
],
[
"Proebst",
"F.",
""
],
[
"Seidel",
"W.",
""
],
[
"Stodolsky",
"L.",
""
]
] |
0707.0767 | Nicolas Michel | N. Michel, W. Nazarewicz and M. Ploszajczak | Continuum Coupling and Single-Nucleon Overlap Integrals | 9 figures; 23 pages; corrected version; accepted in Nuclear Physics A | Nucl.Phys.A794:29-46,2007 | 10.1016/j.nuclphysa.2007.07.004 | null | nucl-th | null | The presence of a particle continuum, both of a resonant and non-resonant
character, can significantly impact spectroscopic properties of weakly bound
nuclei and excited nuclear states close to, and above, the particle emission
threshold. In the framework of the continuum shell model in the complex
momentum-plane, the so-called Gamow Shell Model, we discuss salient effects of
the continuum coupling on the one-neutron overlap integrals and the associated
spectroscopic factors in neutron-rich helium and oxygen nuclei. In particular,
we demonstrate a characteristic near-threshold energy dependence of the
spectroscopic factors for different l-waves. We show also that the realistic
radial overlap functions, which are needed for the description of transfer
reactions, can be generated by single-particle wave functions of the
appropriately chosen complex potential.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:12:03 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 12:14:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Michel",
"N.",
""
],
[
"Nazarewicz",
"W.",
""
],
[
"Ploszajczak",
"M.",
""
]
] |
0707.0768 | W. Prellier | P. Padhan, W. Prellier and R.C. Budhani | Anomalous exchange coupling in transition-metal-oxide based
superlattices with antiferromagnetic spacer layers | Submitted to J. Appl. Phys | J. Appl. Phys. 102 (2007) 043909 | 10.1063/1.2770818 | null | cond-mat.str-el cond-mat.mtrl-sci | null | A direct correlation is seen between the coercive field (HC) and the
magnetic-field-dependent resistivity (MR) in SrMnO3/SrRuO3 superlattices of
perpendicular magnetic anisotropy. The magnetoresistance shows a sharp jump at
Hc for in-plane current and the out-of-plane magnetic field. Both HC and
high-field MR also oscillate with the thickness of the SrMnO3 spacer layers
separating the metallic ruthenate. Since the spacer in these superlattices has
no mobile carriers to facilitate an oscillatory coupling, we attribute the
observed behavior to the spin-polarized quantum tunneling of electrons between
the ferromagnetic layers and antiferromagnetically ordered t2g spins of SrMnO3.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:17:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Padhan",
"P.",
""
],
[
"Prellier",
"W.",
""
],
[
"Budhani",
"R. C.",
""
]
] |
0707.0769 | Makoto Umeki Dr. | Makoto Umeki | Double Periodicity and Frequency-Locking in the Langford Equation | 9 pages, 10 figures, 2 tables, submitted to JJIAM | null | null | null | physics.flu-dyn physics.gen-ph | null | The bifurcation structure of the Langford equation is studied numerically in
detail. Periodic, doubly-periodic, and chaotic solutions and the routes to
chaos via coexistence of double periodicity and period-doubling bifurcations
are found by the Poincar\'e plot of successive maxima of the first mode $x_1$.
Frequency-locked periodic solutions corresponding to the Farey sequence $F_n$
are examined up to $n=14$. Period-doubling bifurcations appears on some of the
periodic solutions and the similarity of bifurcation structures between the
sine-circle map and the Langford equation is shown. A method to construct the
Poincar\'e section for triple periodicity is proposed.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:53:48 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Umeki",
"Makoto",
""
]
] |
0707.0770 | Ardiley Torres Avelar | Simone Souza, A. T. Avelar, J. M. C. Malbouisson, and B. Baseia | Conditional displacement operator for traveling fields | null | null | 10.1016/j.optcom.2008.01.056 | null | quant-ph | null | We show that the conditional displacement operator $\hat{U}_{CD}=\exp
[\hat{b}^{\dagger}\hat{b}(\beta \hat{a}^{\dagger}-\beta ^{\ast}\hat{a})]$
acting upon an arbitrary state of traveling waves can be well approximated by
the action of a Kerr medium placed between two beam splitters whose respective
second ports are fed by highly excited coherent states. Applications to the
generation of nonclassical states and measurement of Wigner function of
arbitrary states are also considered.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:39:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Souza",
"Simone",
""
],
[
"Avelar",
"A. T.",
""
],
[
"Malbouisson",
"J. M. C.",
""
],
[
"Baseia",
"B.",
""
]
] |
0707.0771 | Sergey Ivashkovich | S. Ivashkovich, V. Shevchishin | Local properties of J-complex curves in Lipschitz-continuous structures | Minor corrections and improvements. One example added. To appear in
Math. Zeitschrift. | null | null | null | math.CV math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of primitive curves and positivity of intersections of
$J$-complex curves for Lipschitz-continuous almost complex structures. These
results are deduced from the Comparison Theorem for $J$-holomorphic maps in
Lipschitz structures, previously known for $J$ of class $C^{1, Lip}$. We also
give the optimal regularity of curves in Lipschitz structures. It occurs to be
$C^{1,LnLip}$, i.e. the first derivatives of a $J$-complex curve for Lipschitz
$J$ are Log-Lipschitz-continuous. A simple example that nothing better can be
achieved is given. Further we prove the Genus Formula for $J$-complex curves
and determine their principal Puisieux exponents (all this for
Lipschitz-continuous $J$-s).
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 12:41:08 GMT"
},
{
"version": "v2",
"created": "Sat, 14 Mar 2009 12:38:27 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Oct 2009 08:48:28 GMT"
},
{
"version": "v4",
"created": "Thu, 1 Apr 2010 13:07:38 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Ivashkovich",
"S.",
""
],
[
"Shevchishin",
"V.",
""
]
] |
0707.0772 | Xavier-Fran\c{c}ois Roblot | Christophe Delaunay and Xavier-Fran\c{c}ois Roblot | Regulators of rank one quadratic twists | 28 pages with 32 figures | null | null | null | math.NT | null | We investigate the regulators of elliptic curves with rank 1 in some families
of quadratic twists of a fixed elliptic curve. In particular, we formulate some
conjectures on the average size of these regulators. We also describe an
efficient algorithm to compute explicitly some of the invariants of an odd
quadratic twist of an elliptic curve (regulator, order of the Tate-Shafarevich
group, etc.) and we discuss the numerical data that we obtain and compare it
with our predictions.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:02:50 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 16:18:00 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Delaunay",
"Christophe",
""
],
[
"Roblot",
"Xavier-François",
""
]
] |
0707.0773 | Christian Schwinn | Martin Beneke, Pietro Falgari, Christian Schwinn (RWTH Aachen), Adrian
Signer (IPPP Durham), Giulia Zanderighi (CERN) | Four-fermion production near the W pair production threshold | 53 pages, v2: version to be published, inessential modifications | Nucl.Phys.B792:89-135,2008 | 10.1016/j.nuclphysb.2007.09.030 | PITHA 07/05, IPPP/07/35, CERN-PH-TH-07-107 | hep-ph hep-ex | null | We perform a dedicated study of the four-fermion production process e- e+ ->
mu- nubar_mu u dbar X near the W pair-production threshold in view of the
importance of this process for a precise measurement of the W boson mass.
Accurate theoretical predictions for this process require a systematic
treatment of finite-width effects. We use unstable-particle effective field
theory (EFT) to perform an expansion in the coupling constants, GammaW/MW, and
the non-relativistic velocity v of the W boson up to next-to-leading order in
GammaW/MW ~ alpha_ew ~ v^2. We find that the dominant theoretical uncertainty
in MW is currently due to an incomplete treatment of initial-state radiation.
The remaining uncertainty of the NLO EFT calculation translates into delta MW ~
10-15 MeV, and to about 5 MeV with additional input from the NLO four-fermion
calculation in the full theory.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:51:31 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 09:46:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Beneke",
"Martin",
"",
"RWTH Aachen"
],
[
"Falgari",
"Pietro",
"",
"RWTH Aachen"
],
[
"Schwinn",
"Christian",
"",
"RWTH Aachen"
],
[
"Signer",
"Adrian",
"",
"IPPP Durham"
],
[
"Zanderighi",
"Giulia",
"",
"CERN"
]
] |
0707.0774 | Daniel Alpay A | Daniel Alpay, Olga Timoshenko, and Dan Volok | Caratheodory-Fejer interpolation and related topics in locally convex
spaces | null | null | null | null | math.FA math.CV | null | We study Caratheodory-Herglotz functions whose values are continuous
operators from a locally convex topological space which admits the
factorization property into its conjugate dual space. We show how this case can
be reduced to the case of functions whose values are bounded operators from a
Hilbert space into itself.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:04:36 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Alpay",
"Daniel",
""
],
[
"Timoshenko",
"Olga",
""
],
[
"Volok",
"Dan",
""
]
] |
0707.0775 | Falk Bruckmann | Falk Bruckmann | Instanton constituents in the O(3) model at finite temperature | 5 pages, 12 plots in 3 figures | Phys.Rev.Lett.100:051602,2008 | 10.1103/PhysRevLett.100.051602 | null | hep-th cond-mat.str-el hep-lat hep-ph | null | It is shown that instantons in the O(3) model at finite temperature consist
of fractional charge constituents and the (topological) properties of the
latter are discussed.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:15:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bruckmann",
"Falk",
""
]
] |
0707.0776 | Eitan Rowen | E. E. Rowen, N. Bar-Gill, R. Pugatch, N. Davidson | Damping of bulk excitations over an elongated BEC - the role of radial
modes | 5 pages, 4 figures | null | 10.1103/PhysRevA.77.033602 | null | cond-mat.other | null | We report the measurement of Beliaev damping of bulk excitations in cigar
shaped Bose Einstein condensates of atomic vapor. By using post selection,
excitation line shapes of the total population are compared with those of the
undamped excitations. We find that the damping depends on the initial
excitation energy of the decaying quasi particle, as well as on the excitation
momentum. We model the condensate as an infinite cylinder and calculate the
damping rates of the different radial modes. The derived damping rates are in
good agreement with the experimentally measured ones. The damping rates
strongly depend on the destructive interference between pathways for damping,
due to the quantum many-body nature of both excitation and damping products.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:19:11 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Rowen",
"E. E.",
""
],
[
"Bar-Gill",
"N.",
""
],
[
"Pugatch",
"R.",
""
],
[
"Davidson",
"N.",
""
]
] |
0707.0777 | Christophe Adami | C. Adami, M.P. Ulmer, F. Durret, G. Covone, E. Cypriano, et al | An extension of the SHARC survey | Accepted in A&A | null | 10.1051/0004-6361:20077243 | null | astro-ph | null | We report on our search for distant clusters of galaxies based on optical and
X-ray follow up observations of X-ray candidates from the SHARC survey. Based
on the assumption that the absence of bright optical or radio counterparts to
possibly extended X-ray sources could be distant clusters. We have obtained
deep optical images and redshifts for several of these objects and analyzed
archive XMM-Newton or Chandra data where applicable. In our list of candidate
clusters, two are probably galaxy structures at redshifts of z$\sim$0.51 and
0.28. Seven other structures are possibly galaxy clusters between z$\sim$0.3
and 1. Three sources are identified with QSOs and are thus likely to be X-ray
point sources, and six more also probably fall in this category. One X-ray
source is spurious or variable. For 17 other sources, the data are too sparse
at this time to put forward any hypothesis on their nature. We also
serendipitously detected a cluster at z=0.53 and another galaxy concentration
which is probably a structure with a redshift in the [0.15-0.6] range. We
discuss these results within the context of future space missions to
demonstrate the necessity of a wide field of view telescope optimized for the
0.5-2 keV range.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:13:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Adami",
"C.",
""
],
[
"Ulmer",
"M. P.",
""
],
[
"Durret",
"F.",
""
],
[
"Covone",
"G.",
""
],
[
"Cypriano",
"E.",
""
]
] |
0707.0778 | Manuel Gadella | M. Gadella, S. Wickramasekara | On the applications of Hardy class functions in scattering theory | 22 pages | null | null | null | math-ph math.MP | null | This paper is a response to an article (R. de la Madrid, Journal of Physics
A: Mathematical and General, 39,9255-9268 (2006)) recently published in Journal
of Physics A: Mathematical and Theoretical. The article claims that the theory
of resonances and decaying states based on certain rigged Hilbert spaces of
Hardy functions is physically untenable. In this paper we show that all of the
key conclusions of the cited article are the result of either the errors in
mathematical reasoning or an inadequate understanding of the literature on the
subject.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:30:37 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Gadella",
"M.",
""
],
[
"Wickramasekara",
"S.",
""
]
] |
0707.0779 | Mustapha Rais | Mustapha Ra\"is | Note sur les invariants du groupe affine | null | null | null | null | math.RT | null | In the paper, it is proved that any $C^{1}$-function on GL(n) which is
locally $P$-invariant (here $P$ is the affine (sub)group of GL(n)) is locally
$G$-invairant. There is also a statement for distributions (a very weak form of
Baruch's results).
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:39:02 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Raïs",
"Mustapha",
""
]
] |
0707.0780 | Boris Zilber | B.Zilber | Non-commutative Zariski geometries and their classical limit | null | null | null | null | math.QA math.LO | null | We undertake a case study of two series of nonclassical Zariski geometries.
We show that these geometries can be realised as representations of certain
noncommutative $C^*$-algebras and introduce a natural limit construction which
for each of the two series produces a classical U(1)-gauge field over a
2-dimensional Riemann surface.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:39:31 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Zilber",
"B.",
""
]
] |
0707.0781 | Evgeny Komarov | E.V.Komarov, Yu.A.Simonov | Nonperturbative equation of state of quark-gluon plasma. Applications | 20 pages, 6 figures | AnnalsPhys.323:783-811,2008; AnnalsPhys.323:1230-1246,2008 | 10.1016/j.aop.2007.05.007 10.1016/j.aop.2007.07.005 | null | hep-ph | null | The vacuum-driven nonperturbative factors $L_i$ for quark and gluon Green's
functions are shown to define the nonperturbative dynamics of QGP in the
leading approximation. EoS obtained recently in the framework of this approach
is compared in detail with known lattice data for $\mu=0$ including $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$. The basic role in the dynamics at
$T\la 3T_c$ is played by the factors $L_i$ which are approximately equal to the
modulus of Polyakov line for quark $L_{fund}$ and gluon $L_{adj}$. The
properties of $L_i$ are derived from field correlators and compared to lattice
data, in particular the Casimir scaling property $L_{adj}
=(L_{fund})^{\frac{C_2(adj)}{C_2(fund)}}$ follows in the Gaussian approximation
valid for small vacuum correlation lengths. Resulting curves for $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$ are in a reasonable agreement with
lattice data, the remaining difference points out to an effective attraction
among QGP constituents.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:57:09 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 14:17:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Komarov",
"E. V.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] |
0707.0782 | Mustapha Rais | Mustapha Ra\"is | Notes sur la notion d'invariant caract\'eristique | null | null | null | null | math.RT | null | Let $G$ be a Lie group acting on a vector space $V$. Given a set of
$G$-invariants, one can ask the question : does this set of invariants
characterize the group $G$ ? We recall here some known results, ask questions
and state some conjectures for different choices of invariants : polynomial
functions, orbits, distributions, and different types of groups.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:43:32 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Raïs",
"Mustapha",
""
]
] |
0707.0783 | Marian Aprodu | Marian Aprodu (IMAR) and Daniel Naie (LAREMA) | Log-canonical threshold for curves on a smooth surface | null | null | null | null | math.AG | null | It is shown that the log-canonical threshold of a curve with an isolated
singularity is computed by the term ideal of the curve in a suitable system of
local parameters at the singularity. The proof uses the Enriques diagram of the
singularity and shows that the log-canonical threshold depends only on a
non-degenerate path of that diagram.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:48:38 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Aprodu",
"Marian",
"",
"IMAR"
],
[
"Naie",
"Daniel",
"",
"LAREMA"
]
] |
0707.0784 | Miguel Araujo | M.A.N Araujo, J. Berakdar, V.K. Dugaev and V. R. Vieira | Role of a spin-flip scatterer in a magnetized Luttinger liquid | 6 pages, 2 figures | Phys. Rev. B76, 205107 (2007) | 10.1103/PhysRevB.76.205107 | null | cond-mat.str-el | null | We study the spin-dependent scattering of charge carriers in a magnetized one
dimensional Luttinger liquid from a localized non-homogeneous magnetic field,
which might be brought about by the stray field of magnetic tip near a uniform
liquid, or by a transverse domain wall (DW) between two oppositely magnetized
liquids.
From a renormalization group treatment of the electron interactions we deduce
scaling equations for the transmission and reflection amplitudes as the
bandwidth is progressively reduced to an energy scale set by the temperature.
The repulsive interactions dictate two possible zero temperature insulator
fixed points: one in which electrons are reflected in the same spin channel and
another where the electron spin is reversed upon reflection. In the latter
case, a finite spin current emerges in the absence of a charge current at zero
temperature and the Friedel oscillations form a transverse spiraling spin
density. Adding a purely potential scattering term has no effect on the fixed
points of a uniformly magnetized liquid. For a DW we find that the introduction
of potential scattering stabilizes the spin-flip insulator phase even if the
single-particle spin-flip scattering produced by the DW is arbitrarily weak.
The potential can be induced externally, e.g. by a local gate voltage or a
constriction, providing a means for controlling the transport properties of the
wire.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:53:13 GMT"
}
] | 2013-02-15T00:00:00 | [
[
"Araujo",
"M. A. N",
""
],
[
"Berakdar",
"J.",
""
],
[
"Dugaev",
"V. K.",
""
],
[
"Vieira",
"V. R.",
""
]
] |
0707.0785 | Matthieu Picantin | Matthieu Picantin (LIAFA) | Garside monoids vs divisibility monoids | null | null | null | null | math.GR cs.DM | null | Divisibility monoids (resp. Garside monoids) are a natural algebraic
generalization of Mazurkiewicz trace monoids (resp. spherical Artin monoids),
namely monoids in which the distributivity of the underlying lattices (resp.
the existence of common multiples) is kept as an hypothesis, but the relations
between the generators are not supposed to necessarily be commutations (resp.
be of Coxeter type). Here, we show that the quasi-center of these monoids can
be studied and described similarly, and then we exhibit the intersection
between the two classes of monoids.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 13:53:18 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Picantin",
"Matthieu",
"",
"LIAFA"
]
] |
0707.0786 | Bozidar Mitrovic | Bozidar Mitrovic and Lee A. Rozema | On the correct formula for the lifetime broadened superconducting
density of states | 6 pages, 4 figures | null | 10.1088/0953-8984/20/01/015215 | null | cond-mat.supr-con | null | We argue that the well known Dynes formula [Dynes R C {\it et al.} 1978 {\it
Phys. Rev. Lett.} {\bf 41} 1509] for the superconducting quasiparticle density
of states, which tries to incorporate the lifetime broadening in an approximate
way, cannot be justified microscopically for conventional superconductors.
Instead, we propose a new simple formula in which the energy gap has a finite
imaginary part $-\Delta_2$ and the quasiparticle energy is real. We prove that
in the quasiparticle approximation 2$\Delta_2$ gives the quasiparticle decay
rate at the gap edge for conventional superconductors. This conclusion does not
depend on the nature of interactions that cause the quasiparticle decay. The
new formula is tested on the case of a strong coupling superconductor
Pb$_{0.9}$Bi$_{0.1}$ and an excellent agreement with theoretical predictions is
obtained. While both the Dynes formula and the one proposed in this work give
good fits and fit parameters for Pb$_{0.9}$Bi$_{0.1}$, only the latter formula
can be justified microscopically.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:21:15 GMT"
},
{
"version": "v2",
"created": "Wed, 14 Nov 2007 20:10:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mitrovic",
"Bozidar",
""
],
[
"Rozema",
"Lee A.",
""
]
] |
0707.0787 | Tao Xu | Hai-Qiang Zhang, Juan Li, Tao Xu, Ya-Xing Zhang and Bo Tian | Symbolic-computation study of integrable properties for the
(2+1)-dimensional Gardner equation with the two-singular-manifold method | null | null | null | null | nlin.SI nlin.PS | null | The singular manifold method from the Painleve analysis can be used to
investigate many important integrable properties for the nonlinear partial
differential equations.In this paper, the two-singular-manifold method is
applied to the (2+1)-dimensional Gardner equation with two Painleve expansion
branches to determine the Hirota bilinear form, Backlund transformation, Lax
pairs and Darboux transformation. Based on the obtained Lax pairs, the binary
Darboux transformation is constructed and the N N Grammian solution is also
derived by performing the iterative algorithm Ntimes with symbolic computation.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:22:54 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Zhang",
"Hai-Qiang",
""
],
[
"Li",
"Juan",
""
],
[
"Xu",
"Tao",
""
],
[
"Zhang",
"Ya-Xing",
""
],
[
"Tian",
"Bo",
""
]
] |
0707.0788 | Luca Pasquini | L. Pasquini, M.P. Doellinger, A. Weiss, L. Girardi, C. Chavero, A.P.
Hatzes, L. da Silva, J. Setiawan | Evolved stars hint to an external origin of enhanced metallicity in
planet-hosting stars | A&A, in press | null | 10.1051/0004-6361:20077814 | null | astro-ph | null | Exo-planets are preferentially found around high metallicity main sequence
stars. We aim at investigating whether evolved stars share this property, and
what this tells about planet formation. Statistical tools and the basic
concepts of stellar evolution theory are applied to published results as well
as our own radial velocity and chemical analyses of evolved stars. We show that
the metal distributions of planet-hosting (P-H) dwarfs and giants are
different, and that the latter do not favor metal-rich systems. Rather, these
stars follow the same age-metallicity relation as the giants without planets in
our sample. The straightforward explanation is to attribute the difference
between dwarfs and giants to the much larger masses of giants' convective
envelopes. If the metal excess on the main sequence is due to pollution, the
effects of dilution naturally explains why it is not observed among evolved
stars. Although we cannot exclude other explanations, the lack of any
preference for metal-rich systems among P-H giants could be a strong indication
of the accretion of metal-rich material. We discuss further tests, as well as
some predictions and consequences of this hypothesis.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:24:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pasquini",
"L.",
""
],
[
"Doellinger",
"M. P.",
""
],
[
"Weiss",
"A.",
""
],
[
"Girardi",
"L.",
""
],
[
"Chavero",
"C.",
""
],
[
"Hatzes",
"A. P.",
""
],
[
"da Silva",
"L.",
""
],
[
"Setiawan",
"J.",
""
]
] |
0707.0789 | Vladimir Kartsovnik Dr. | W.I. Kartsovnik, V.V. Pelekh | On the mechanism of the flow of polymers | 8 pages | null | null | null | cond-mat.soft | null | A non-Newtonian flow of a polymer melt is discussed. The description of the
exponential decrease of the apparent viscosity by the well-known Eyring formula
with an activation energy reduction proportional to the shear stress does not
take into account specific features of the polymeric structure. We propose to
modify the description of the macromolecular flow mechanism by including
conformational changes of the polymeric chains. The elasticity of a strained
polymeric chain, having an entropy origin, can be the reason of the reduction
of the activation energy for the transition of a molecular-kinetic unit of the
chain into a new equilibrium state in the flow direction during the thermal
fluctuation. In that case, the activation energy of the transition should
decrease by a value proportional to the reversible high-elastic component of
the shear deformation caused by the flow of the polymer.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 17:35:33 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Kartsovnik",
"W. I.",
""
],
[
"Pelekh",
"V. V.",
""
]
] |
0707.0790 | Martin Feix | M. Feix, C. Fedeli and M. Bartelmann | Asymmetric Gravitational Lenses in TeVeS and Application to the Bullet
Cluster | LaTex, 14 pages, 10 figures, references added, 2 figures removed,
minor text changes to fit accepted version (A&A) | Astron.Astrophys. 480, 313-325 (2008) | 10.1051/0004-6361:20078224 | null | astro-ph | null | Aims: We explore the lensing properties of asymmetric matter density
distributions in Bekenstein's Tensor-Vector-Scalar theory (TeVeS). Methods:
Using an iterative Fourier-based solver for the resulting non-linear scalar
field equation, we numerically calculate the total gravitational potential and
derive the corresponding TeVeS lensing maps. Results: Considering variations on
rather small scales, we show that the lensing properties significantly depend
on the lens's extent along the line of sight. Furthermore, all simulated TeVeS
convergence maps strongly track the dominant baryonic components, non-linear
effects, being capable of counteracting this trend, turn out to be very small.
Setting up a toy model for the cluster merger 1E0657-558, we infer that TeVeS
cannot explain observations without assuming an additional dark mass component
in both cluster centers, which is in accordance with previous work.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:34:34 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 00:13:02 GMT"
}
] | 2008-03-06T00:00:00 | [
[
"Feix",
"M.",
""
],
[
"Fedeli",
"C.",
""
],
[
"Bartelmann",
"M.",
""
]
] |
0707.0791 | William A. Atkinson | Yun Song, R. Wortis, W. A. Atkinson | Dynamical Mean Field Study of the Two-Dimensional Disordered Hubbard
Model | 5 pages, 4 figures. Revised version, In Press Phys. Rev. B | Phys. Rev. B 77, 054202 (2008) | 10.1103/PhysRevB.77.054202 | null | cond-mat.str-el cond-mat.dis-nn | null | We study the two-dimensional paramagnetic Anderson-Hubbard model using an
extension of dynamical mean-field theory that allows us to treat disorder and
strong electronic correlations on equal footing. We investigate the scaling of
the inverse participation ratio at quarter- and half-filling and find a
nonmonotonic dependence of the localization length on the interaction strength.
We do not find evidence for an insulator-metal transition. The disorder
potential becomes unscreened near the Mott transition. Furthermore, strong
correlations suppress the Altshuler-Aronov density of states anomaly near
half-filling.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:33:56 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jan 2008 10:59:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Song",
"Yun",
""
],
[
"Wortis",
"R.",
""
],
[
"Atkinson",
"W. A.",
""
]
] |
0707.0792 | Matthias Punk | M. Punk, W. Zwerger | Theory of RF-spectroscopy of strongly interacting Fermions | revised version, 4 pages, 3 figures, RevTex4 | null | 10.1103/PhysRevLett.99.170404 | null | cond-mat.other | null | We show that strong pairing correlations in Fermi gases lead to the
appearance of a gap-like structure in the RF-spectrum, both in the balanced
superfluid and in the normal phase above the Clogston-Chandrasekhar limit. The
average RF-shift of a unitary gas is proportional to the ratio of the Fermi
velocity and the scattering length with the final state. In the strongly
imbalanced case, the RF-spectrum measures the binding energy of a minority atom
to the Fermi sea of majority atoms. Our results provide a qualitative
understanding of recent experiments by Schunck et.al.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:28:49 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Sep 2007 16:08:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Punk",
"M.",
""
],
[
"Zwerger",
"W.",
""
]
] |
0707.0793 | Francesco Becattini | F. Becattini, L. Ferroni (University of Florence and INFN) | The microcanonical ensemble of the ideal relativistic quantum gas with
angular momentum conservation | 38 pages; minor corrections to the formulae for the published version | Eur.Phys.J.C52:597-615,2007 | 10.1140/epjc/s10052-007-0403-7 | null | nucl-th cond-mat.stat-mech | null | We derive the microcanonical partition function of the ideal relativistic
quantum gas with fixed intrinsic angular momentum as an expansion over fixed
multiplicities. We developed a group theoretical approach by generalizing known
projection techniques to the Poincare' group. Our calculation is carried out in
a quantum field framework and applies to particles with any spin. It extends
known results in literature in that it does not introduce any large volume
approximation and it takes particle spin fully into account. We provide
expressions of the microcanonical partition function at fixed multiplicities in
the limiting classical case of large volumes and large angular momenta and in
the grand-canonical ensemble. We also derive the microcanonical partition
function of the ideal relativistic quantum gas with fixed parity.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:40:19 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 17:13:16 GMT"
},
{
"version": "v3",
"created": "Wed, 17 Oct 2007 16:12:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Becattini",
"F.",
"",
"University of Florence and INFN"
],
[
"Ferroni",
"L.",
"",
"University of Florence and INFN"
]
] |
0707.0794 | Uwe C. T\"auber | Uwe C. Tauber | Field-theoretic methods | Article for the Encyclopedia of Complexity and System Science, B.
Meyers (Ed.), Springer-Verlag Berlin, 2008 | Encyclopedia of Complexity and Systems Science, Robert A. Meyers
(ed.), Springer; New York, 2009; pp. 3360-3374 | 10.1007/978-0-387-30440-3_200 | null | cond-mat.stat-mech | null | Many complex systems are characterized by intriguing spatio-temporal
structures. Their mathematical description relies on the analysis of
appropriate correlation functions. Functional integral techniques provide a
unifying formalism that facilitates the computation of such correlation
functions and moments, and furthermore allows a systematic development of
perturbation expansions and other useful approximative schemes. It is explained
how nonlinear stochastic processes may be mapped onto exponential probability
distributions, whose weights are determined by continuum field theory actions.
Such mappings are madeexplicit for (1) stochastic interacting particle systems
whose kinetics is defined through a microscopic master equation; and (2)
nonlinear Langevin stochastic differential equations which provide a mesoscopic
description wherein a separation of time scales between the relevant degrees of
freedom and background statistical noise is assumed. Several well-studied
examples are introduced to illustrate the general methodology.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:43:50 GMT"
}
] | 2009-11-12T00:00:00 | [
[
"Tauber",
"Uwe C.",
""
]
] |
0707.0795 | Prasanna Sahoo Dr | Valeriy A. Faiziev and Prasanna K. Sahoo | Stability of a functional equation of Deeba on semigroups | 29 pages | null | null | null | math.CA math.FA | null | Let $S$ be a semigroup and $X$ a Banach space. The functional equation $\phi
(xyz)+ \phi (x) + \phi (y) + \phi (z) = \phi (xy) + \phi (yz) + \phi (xz)$ is
said to be stable for the pair $(X, S)$ if and only if $f: S\to X$ satisfying
$\| f(xyz)+f(x) + f(y) + f(z) - f(xy)- f(yz)-f(xz)\| \leq \delta $ for some
positive real number $\delta$ and all $x, y, z \in S$, there is a solution
$\phi : S \to X$ such that $f-\phi$ is bounded. In this paper, among others, we
prove the following results: 1) this functional equation, in general, is not
stable on an arbitrary semigroup; 2) this equation is stable on periodic
semigroups; 3) this equation is stable on abelian semigroups; 4) any semigroup
with left (or right) law of reduction can be embedded into a semigroup with
left (or right) law of reduction where this equation is stable.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:50:35 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Faiziev",
"Valeriy A.",
""
],
[
"Sahoo",
"Prasanna K.",
""
]
] |
0707.0796 | Alessandro Nordio | A. Nordio, C.-F. Chiasserini, E. Viterbo | Performance of Linear Field Reconstruction Techniques with Noise and
Uncertain Sensor Locations | null | null | 10.1109/TSP.2008.924865 | null | cs.OH | null | We consider a wireless sensor network, sampling a bandlimited field,
described by a limited number of harmonics. Sensor nodes are irregularly
deployed over the area of interest or subject to random motion; in addition
sensors measurements are affected by noise. Our goal is to obtain a high
quality reconstruction of the field, with the mean square error (MSE) of the
estimate as performance metric. In particular, we analytically derive the
performance of several reconstruction/estimation techniques based on linear
filtering. For each technique, we obtain the MSE, as well as its asymptotic
expression in the case where the field number of harmonics and the number of
sensors grow to infinity, while their ratio is kept constant. Through numerical
simulations, we show the validity of the asymptotic analysis, even for a small
number of sensors. We provide some novel guidelines for the design of sensor
networks when many parameters, such as field bandwidth, number of sensors,
reconstruction quality, sensor motion characteristics, and noise level of the
measures, have to be traded off.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:58:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nordio",
"A.",
""
],
[
"Chiasserini",
"C. -F.",
""
],
[
"Viterbo",
"E.",
""
]
] |
0707.0797 | Barbara Mele | Emidio Gabrielli, Barbara Mele, and Johan Rathsman | Higgs boson plus photon production at the LHC: a clean probe of the
b-quark parton densities | 10 pages, 4 figures, a few comments and 3 references added at the
end. To appear in Physical Review D | Phys.Rev.D77:015007,2008 | 10.1103/PhysRevD.77.015007 | null | hep-ph | null | Higgs boson production in association with a high pT photon at the CERN Large
Hadron Collider is analyzed, in the framework of the MSSM model, for the
heavier neutral Higgs bosons. The request of an additional photon in the
exclusive Higgs boson final state selects b-quark pairs among the possible
initial partonic states, since gluon-gluon initial states are not allowed by
C-parity conservation. Hence, the measurement of cross sections for neutral
Higgs boson plus photon production can provide a clean probe of the b-quark
density in the proton as well as of the b-quark Yukawa coupling. The
suppression of the production rates by the b-quark electromagnetic coupling can
be compensated by the enhanced Higgs boson Yukawa coupling to b's in the large
tan(beta) regime. The Higgs boson decay into a tau-lepton pair is considered,
and irreducible backgrounds with corresponding signal significances are
evaluated.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 14:58:40 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 12:40:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gabrielli",
"Emidio",
""
],
[
"Mele",
"Barbara",
""
],
[
"Rathsman",
"Johan",
""
]
] |
0707.0798 | Markus Kindermann | M. Kindermann | Hall effect between parallel quantum wires | 5 pages, 2 figures, missing summation added to Eq. (6), more thorough
discussion of the experimental signatures | Europhys. Lett. 83, 47002 (2008) | 10.1209/0295-5075/83/47002 | null | cond-mat.mes-hall cond-mat.str-el | null | We study theoretically the parallel quantum wires of the experiment by
Auslaender et al. [Science 308, 88 (2005)] at low electron density. It is shown
that a Hall effect as observed in two- or three-dimensional electron systems
develops as one of the two wires enters the spin-incoherent regime of small
spin bandwidth. This together with magnetic field dependent tunneling exponents
clearly identifies spin-incoherence in such experiments and it serves to
distinguish it from disorder effects.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:43:38 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 19:17:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kindermann",
"M.",
""
]
] |
0707.0799 | Xinjia Chen | Xinjia Chen, Kemin Zhou and Jorge Aravena | A New Family of Unitary Space-Time Codes with a Fast Parallel Sphere
Decoder Algorithm | 66 pages, 7 figures | IEEE Transactions on Information Theory, vol. 52, pp. 115-140,
January 2006 | null | null | cs.IT math.IT | null | In this paper we propose a new design criterion and a new class of unitary
signal constellations for differential space-time modulation for
multiple-antenna systems over Rayleigh flat-fading channels with unknown fading
coefficients. Extensive simulations show that the new codes have significantly
better performance than existing codes. We have compared the performance of our
codes with differential detection schemes using orthogonal design, Cayley
differential codes, fixed-point-free group codes and product of groups and for
the same bit error rate, our codes allow smaller signal to noise ratio by as
much as 10 dB. The design of the new codes is accomplished in a systematic way
through the optimization of a performance index that closely describes the bit
error rate as a function of the signal to noise ratio. The new performance
index is computationally simple and we have derived analytical expressions for
its gradient with respect to constellation parameters. Decoding of the proposed
constellations is reduced to a set of one-dimensional closest point problems
that we solve using parallel sphere decoder algorithms. This decoding strategy
can also improve efficiency of existing codes.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 19:01:53 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Chen",
"Xinjia",
""
],
[
"Zhou",
"Kemin",
""
],
[
"Aravena",
"Jorge",
""
]
] |
0707.0800 | Chung Yue Hui David | C. Y. Hui, W. Becker (MPE) | Resolving the bow-shock nebula around the old pulsar PSR B1929+10 with
multi-epoch Chandra observations | Accepted by A&A, revised in accordance with referee's comments | null | 10.1051/0004-6361:20078227 | null | astro-ph | null | We have studied the nearby old pulsar PSR B1929+10 and its surrounding
interstellar medium utilizing the sub-arcsecond angular resolution of the
Chandra X-ray Observatory. The Chandra data are found to be fully consistent
with the results obtained from deep XMM-Newton observations as far as the
pulsar is concerned. We confirm the non-thermal emission nature of the pulsar's
X-radiation. In addition to the X-ray trail already seen in previous
observations by the ROSAT and XMM-Newton X-ray observatories, we discovered an
arc-like nebula surrounding the pulsar. We interpret the feature as a bow-shock
nebula and discuss its energetics in the context of standard shock theory.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:03:43 GMT"
},
{
"version": "v2",
"created": "Thu, 29 May 2008 15:51:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hui",
"C. Y.",
"",
"MPE"
],
[
"Becker",
"W.",
"",
"MPE"
]
] |
0707.0801 | Fuqiang Wang | Fuqiang Wang | In-Medium Properties of Jets | Invited talk at Quark Matter 2006 | J.Phys.G34:S337-S344,2007 | 10.1088/0954-3899/34/8/S20 | null | nucl-ex | null | Modifications of jet-like azimuthal correlations have revealed novel
properties of the medium created in relativistic heavy-ion collisions.
Experimental results on jet-like 2- and 3-particle correlations, specificly
"punch-through" at high transverse momentum, broadening at low and modest
transverse momentum, and particularly the possible experimental evidence for
conical flow, are reviewed. Future prospects of jet-like correlations and their
physics potential are discussed.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:09:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Fuqiang",
""
]
] |
0707.0802 | Patricia Reynier | Dinu Coltuc, Jean-Marc Chassery (GIPSA-lab) | Very fast watermarking by reversible contrast mapping | null | IEEE Signal Processing Letters 14, 4 (04/2007) pp 255-258 | 10.1109/LSP.2006.884895 | null | cs.MM cs.CR cs.CV cs.IT math.IT | null | Reversible contrast mapping (RCM) is a simple integer transform that applies
to pairs of pixels. For some pairs of pixels, RCM is invertible, even if the
least significant bits (LSBs) of the transformed pixels are lost. The data
space occupied by the LSBs is suitable for data hiding. The embedded
information bit-rates of the proposed spatial domain reversible watermarking
scheme are close to the highest bit-rates reported so far. The scheme does not
need additional data compression, and, in terms of mathematical complexity, it
appears to be the lowest complexity one proposed up to now. A very fast lookup
table implementation is proposed. Robustness against cropping can be ensured as
well.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:11:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Coltuc",
"Dinu",
"",
"GIPSA-lab"
],
[
"Chassery",
"Jean-Marc",
"",
"GIPSA-lab"
]
] |
0707.0803 | Gestur Olafsson | Gestur Olafsson and Henrik Schlichtkrull | Representation theory, Radon transform and the heat equation on a
Riemannian symmetric space | null | null | null | null | math.RT | null | Let X=G/K be a Riemannian symmetric space of the noncompact type. We give a
short exposition of the representation theory related to X, and discuss its
holomorphic extension to the complex crown, a G-invariant subdomain in the
complexified symmetric space X_\C=G_\C/K_\C. Applications to the heat transform
and the Radon transform for X are given.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:11:42 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Olafsson",
"Gestur",
""
],
[
"Schlichtkrull",
"Henrik",
""
]
] |
0707.0804 | Brigitte Gaillard | M. Boos (DEPE-Iphc), C. Zimmer (DEPE-Iphc), A. Carriere (DEPE-Iphc),
J.P. Robin (DEPE-Iphc), O. Petit (DEPE-Iphc) | Post-hatching parental care behaviour and hormonal status in a precocial
bird | null | Behavioural Processes (18/05/2007) sous presse | 10.1016/j.beproc.2007.05.003 | null | q-bio.PE | null | In birds, the link between parental care behaviour and prolactin release
during incubation persists after hatching in altricial birds, but has never
been precisely studied during the whole rearing period in precocial species,
such as ducks. The present study aims to understand how changes in parental
care after hatching are related to circulating prolactin levels in mallard hens
rearing ducklings. Blood was sampled in hens over at least 13 post-hatching
weeks and the behaviour of the hens and the ducklings was recorded daily until
fledging. Contacts between hens and the ducklings, leadership of the ducklings
and gathering of them steadily decreased over post-hatching time. Conversely,
resting, preening and agonistic behaviour of hens towards ducklings increased.
Plasma prolactin concentrations remained at high levels after hatching and then
fell after week 6 when body mass and structural size of the young were close to
those of the hen. Parental care behaviour declined linearly with brood age,
showed a disruption of the hen-brood bond at week 6 post-hatching and was
related to prolactin concentration according to a sigmoid function. Our results
suggest that a definite threshold in circulating prolactin is necessary to
promote and/or to maintain post-hatching parental care in ducks.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:12:49 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Boos",
"M.",
"",
"DEPE-Iphc"
],
[
"Zimmer",
"C.",
"",
"DEPE-Iphc"
],
[
"Carriere",
"A.",
"",
"DEPE-Iphc"
],
[
"Robin",
"J. P.",
"",
"DEPE-Iphc"
],
[
"Petit",
"O.",
"",
"DEPE-Iphc"
]
] |
0707.0805 | Xinjia Chen | Xinjia Chen | A New Generalization of Chebyshev Inequality for Random Vectors | 7 pages, 1 figure; added some references | null | null | null | math.ST cs.LG math.PR stat.AP stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we derive a new generalization of Chebyshev inequality for
random vectors. We demonstrate that the new generalization is much less
conservative than the classical generalization.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:28:05 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Jun 2011 15:08:17 GMT"
}
] | 2013-11-05T00:00:00 | [
[
"Chen",
"Xinjia",
""
]
] |
0707.0806 | Daniel Beltita | Daniel Beltita and Jose E. Gale | Holomorphic geometric models for representations of $C^*$-algebras | 45 pages | null | null | null | math.OA math.DG | null | Representations of $C^*$-algebras are realized on section spaces of
holomorphic homogeneous vector bundles. The corresponding section spaces are
investigated by means of a new notion of reproducing kernel, suitable for
dealing with involutive diffeomorphisms defined on the base spaces of the
bundles. Applications of this technique to dilation theory of completely
positive maps are explored and the critical role of complexified homogeneous
spaces in connection with the Stinespring dilations is pointed out. The general
results are further illustrated by a discussion of several specific topics,
including similarity orbits of representations of amenable Banach algebras,
similarity orbits of conditional expectations, geometric models of
representations of Cuntz algebras, the relationship to endomorphisms of
${\mathcal B}({\mathcal H})$, and non-commutative stochastic analysis.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:17:49 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 05:58:43 GMT"
}
] | 2008-02-22T00:00:00 | [
[
"Beltita",
"Daniel",
""
],
[
"Gale",
"Jose E.",
""
]
] |
0707.0807 | Nikulov Alexey | S.V. Dubonos, V.L. Gurtovoi, A.V. Nikulov, and V.A. Tulin | Can dc voltage proportional to the persistent current be observed on
segment of asymmetric mesoscopic ring? | 3 pages, 2 figures | in the Proceedings of 15th International Symposium
"Nanostructures: Physics and Technology" St Petersburg: Ioffe Institute, p.
60 (2007) | null | null | cond-mat.supr-con cond-mat.mes-hall | null | In order to clear up a question on possibility of a dc voltage proportional
to the persistent current in normal metal and semiconductor mesoscopic loops
conjectural causes of this phenomenon observed in superconductor loops is
investigated.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:18:08 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Dubonos",
"S. V.",
""
],
[
"Gurtovoi",
"V. L.",
""
],
[
"Nikulov",
"A. V.",
""
],
[
"Tulin",
"V. A.",
""
]
] |
0707.0808 | Patrick C. McGuire | Alexandra Bartolo, Patrick C. McGuire, Kenneth P. Camilleri,
Christopher Spiteri, Jonathan C. Borg, Philip J. Farrugia, Jens Ormo, Javier
Gomez-Elvira, Jose Antonio Rodriguez-Manfredi, Enrique Diaz-Martinez, Helge
Ritter, Robert Haschke, Markus Oesker, Joerg Ontrup | The Cyborg Astrobiologist: Porting from a wearable computer to the
Astrobiology Phone-cam | 15 pages, 4 figures, accepted for publication in the International
Journal of Astrobiology | International Journal of Astrobiology, vol. 6, issue 4, pp.
255-261 (2007) | 10.1017/S1473550407003862 | null | cs.CV astro-ph cs.AI cs.CE cs.HC cs.NI cs.RO cs.SE | null | We have used a simple camera phone to significantly improve an `exploration
system' for astrobiology and geology. This camera phone will make it much
easier to develop and test computer-vision algorithms for future planetary
exploration. We envision that the `Astrobiology Phone-cam' exploration system
can be fruitfully used in other problem domains as well.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:19:37 GMT"
}
] | 2010-01-08T00:00:00 | [
[
"Bartolo",
"Alexandra",
""
],
[
"McGuire",
"Patrick C.",
""
],
[
"Camilleri",
"Kenneth P.",
""
],
[
"Spiteri",
"Christopher",
""
],
[
"Borg",
"Jonathan C.",
""
],
[
"Farrugia",
"Philip J.",
""
],
[
"Ormo",
"Jens",
""
],
[
"Gomez-Elvira",
"Javier",
""
],
[
"Rodriguez-Manfredi",
"Jose Antonio",
""
],
[
"Diaz-Martinez",
"Enrique",
""
],
[
"Ritter",
"Helge",
""
],
[
"Haschke",
"Robert",
""
],
[
"Oesker",
"Markus",
""
],
[
"Ontrup",
"Joerg",
""
]
] |
0707.0809 | Patrizia Michetti | F. Marinetti, Ll. Uranga-Pi\~na, E. Coccia, D. L\'opez-Dur\'an, E.
Bodo, F.A. Gianturco | Microsolvation of cationic dimers in $^4$He droplets: geometries of
A$_2^+$(He)$_N$ (A=Li,Na,K) from optimized energies | null | null | 10.1021/jp0748361 | null | physics.chem-ph | null | Ab initio computed interaction forces are employed in order to describe the
microsolvation of the A$_2^+(^2\Sigma)$ (A=Li,Na,K) molecular ion in $^4$He
clusters of small variable size. The minimum energy structures are obtained by
performing energy minimization based on a genetic algorithm approach. The
symmetry features of the collocation of solvent adatoms around the dimeric
cation are analyzed in detail, showing that the selective growth of small
clusters around the two sides of the ion during the solvation process is a
feature common to all three dopants.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:19:59 GMT"
}
] | 2016-09-28T00:00:00 | [
[
"Marinetti",
"F.",
""
],
[
"Uranga-Piña",
"Ll.",
""
],
[
"Coccia",
"E.",
""
],
[
"López-Durán",
"D.",
""
],
[
"Bodo",
"E.",
""
],
[
"Gianturco",
"F. A.",
""
]
] |
0707.0810 | Alfred Tillich | A. Tillich, U. Heber, S. J. O'Toole, R. {\O}stensen, S. Schuh | The MSST Campaign: II.Effective temperature and gravity variations in
the multi-periodic pulsating subdwarf B star PG1605+072 | 10 pages, 9 figures, Accepted for publication in A&A | null | 10.1051/0004-6361:20077949 | null | astro-ph | null | Stellar oscillations are an important tool to probe the interior of a star.
Subdwarf B stars are core helium burning objects, but their formation is poorly
understood as neither single star nor binary evolution can fully explain their
observed properties. Since 1997 an increasing number of sdB stars has been
found to pulsate forming two classes of stars (the V361 Hya and V1093 Her
stars). We focus on the bright V 361 Hya star PG1605+072 to characterize its
frequency spectrum. While most previous studies relied on light variations, we
have measured radial velocity variations for as much as 20 modes. In this paper
we aim at characterizing the modes from atmospheric parameter and radial
velocity variations. Time resolved spectroscopy ($\approx$9000 spectra) has
been carried out to detect line profile variations from which variations of the
effective temperature and gravity are extracted by means of a quantitative
spectral analysis. We measured variations of effective temperatures and
gravities for eight modes with semi-amplitudes ranging from $\Delta
T_{\rm{eff}}=880$ K to as small as 88 K and $\Delta\log{g}$ of 0.08 dex to as
low as 0.008 dex. Gravity and temperature vary almost in phase, whereas phase
lags are found between temperature and radial velocity. This profound analysis
of a unique data set serves as sound basis for the next step towards an
identification of pulsation modes. As rotation may play an important role the
modelling of pulsation modes is challenging but feasible.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:26:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tillich",
"A.",
""
],
[
"Heber",
"U.",
""
],
[
"O'Toole",
"S. J.",
""
],
[
"Østensen",
"R.",
""
],
[
"Schuh",
"S.",
""
]
] |
0707.0811 | Dmitri Kharzeev | D. Kharzeev, E. Levin and M. Nardi | Hadron multiplicities at the LHC | 2 pages, 2 figures, talk at "Heavy Ion Collisions at the LHC: Last
Call for Predictions" Workshop, CERN, May 14 - June 8, 2007, to appear in the
Proceedings | null | null | BNL-NT-07/31 | hep-ph | null | We present the predictions for hadron multiplicities in pp, pA and AA
collisions at the LHC based on our approach to the Color Glass Condensate.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 19:01:49 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Kharzeev",
"D.",
""
],
[
"Levin",
"E.",
""
],
[
"Nardi",
"M.",
""
]
] |
0707.0812 | Chuan Hung Chen | Chuan-Hung Chen, Chao-Qiang Geng, Soo-Hyeon Nam | Comment on ``New Physics Contributions to the Lifetime Difference in
$D^0-\bar D^{0}$ mixing'' | 2 pages | Phys.Rev.Lett.99:019101,2007 | 10.1103/PhysRevLett.99.019101 | null | hep-ph | null | We find that in the nonmanifest left-right (LR) model, an important LR mixing
effect was not considered in the paper by E. Golowich, S. Pakvasa, and A.
Petrov, Phys. Rev. Lett. 98, 181801 (2007).
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:35:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Nam",
"Soo-Hyeon",
""
]
] |
0707.0813 | Amine Asselah | Amine Asselah | Large Deviations Principle for Self-Intersection Local Times for random
walk in dimension d>4 | 45 pages, 2 figures, thorough revision | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a large deviations principle for the self-intersection local times
for a symmetric random walk in dimension d>4. As an application, we obtain
moderate deviations for random walk in random sceneries in some region of
parameters.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:34:15 GMT"
},
{
"version": "v2",
"created": "Sat, 15 Sep 2007 12:52:07 GMT"
},
{
"version": "v3",
"created": "Sun, 28 Dec 2008 12:46:01 GMT"
}
] | 2008-12-30T00:00:00 | [
[
"Asselah",
"Amine",
""
]
] |
0707.0814 | Dan Allen | D. G. Allen, L. Persechini, S. Takahashi, G. Ramina, M. S. Sherwin | A diffraction-compensating 0-25 ns free space terahertz delay line for
coherent quantum control | null | null | 10.1063/1.2804111 | null | physics.optics | null | Free space delay lines provide pulses of variable time spacing for optical
experiments such as pump-probe spectroscopy and coherent quantum control,
including spin and photon echo techniques. However, in the terahertz (THz)
region of the spectrum, beam divergence due to diffraction limits the useful
length of traditional free space delay lines. We present a novel double-folded
variable delay line for light in the frequency range 0.24-1.2 THz, which
incorporates a symmetric arrangement of lenses whose spacing can be adjusted to
compensate for diffraction at each delay. Scalable for use in other wavelength
regimes, the design relays an input Gaussian beam waist to the output with up
to 25 ns (~8 m) total delay and is enclosed in a desiccated volume of <0.5 m^3.
The delay line can deliver two or three pulses with relative amplitudes
controlled via variable spacing silicon etalon beam splitters. Beam profiles of
a 0.24 THz beam show good agreement with calculations at long delays, with
insertion loss per delay stage of~3 dB.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:42:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Allen",
"D. G.",
""
],
[
"Persechini",
"L.",
""
],
[
"Takahashi",
"S.",
""
],
[
"Ramina",
"G.",
""
],
[
"Sherwin",
"M. S.",
""
]
] |
0707.0815 | Fuqiang Wang | Fuqiang Wang (for the STAR Collaboration) | Forward- and Mid-Rapidity Jet-like correlations | Invited talk at the XIth International Workshop on Correlation and
Fluctuation in Multiparticle Production, Hangzhou, China, November 2007 | Int.J.Mod.Phys. E16 (2008) 3168-3175 | 10.1142/S0218301307009166 | null | nucl-ex | null | Mid-rapidity azimuthal correlations probe di-jets originating mainly from
gluon-gluon hard-scattering. Measurements of such correlations have revealed
significant (gluon-)jet modification in central Au+Au collisions. Azimuthal
correlations of hadrons at forward rapidity with a mid-rapidity high-$\pt$
hadron, on the other hand, probe asymmetric partonic scatterings involving
large-x quarks and small-x gluons. We present preliminary results from STAR on
correlations of charged hadrons at forward rapidity in the forward TPCs
($2.7<|\eta|<3.9$, $\pt<2$ GeV/$c$) with high-$\pt$ charged hadrons at
mid-rapidity from the main TPC ($|\eta|<1$, $\pt>3$ GeV/$c$) in $pp$, d+Au, and
Au+Au collisions at $\snn=200$ GeV. The implications of the results for small-x
gluon distributions (Color Glass Condensate formation) and the energy loss of
quark jets at forward rapidity in nuclear medium are discussed. %Their
measurements in d+Au collisions, separately at the d-side and the Au-side, may
be sensitive to Color Glass Condensate in the Au-nucleus. Their measurements in
Au+Au collisions may probe quark-jet modification in nuclear medium.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:43:44 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Wang",
"Fuqiang",
"",
"for the STAR Collaboration"
]
] |
0707.0816 | Jason Tumlinson | Jason Tumlinson (Yale University) | Carbon-Enhanced Hyper-metal-poor Stars and the Stellar IMF at Low
Metallicity | 11 pages emulateapj text including three figures, accepted for
publication in ApJ v666 (Sept 2007). A companion paper to 0706.2903 | Astrophys.J.665:1361-1370,2007 | 10.1086/519917 | null | astro-ph | null | The two known ``hyper-metal-poor'' (HMP) stars, HE0107-5240 and HE1327-2326,
have extremely high enhancements of the light elements C, N, and O relative to
Fe and appear to represent a statistically significant excess population
relative to the halo metallicity distribution extrapolated from [Fe/H] > -3.
This study weighs the available evidence for and against three hypothetical
origins for these stars: (1) that they formed from gas enriched by a primordial
``faint supernova'', (2) that they formed from gas enriched by core-collapse
supernovae and C-rich gas ejected in rotation-driven winds from massive stars,
and (3) that they formed as the low-mass secondaries in binary systems at Z ~
10^{-5.5} Zsun and acquired their light-element enhancements from an
intermediate-mass companion as it passed through an AGB phase. The observations
interpreted here, especially the depletion of lithium seen in HE1327-2326,
favor the binary mass-transfer hypothesis. If HE0107-5240 and HE1327-2326
formed in binary systems, the statistically significant absence of isolated
and/or C-normal stars at similar [Fe/H] implies that low-mass stars could form
at that metallicity, but that masses M ~< 1.4 Msun were disfavored in the IMF.
This result is also explained if the abundance-derived top-heavy IMF for
primordial stars persists to [Fe/H] ~ -5.5. This finding indicates that
low-mass star formation was possible at extremely low metallicity, and that the
typical stellar mass may have had a complex dependence on metallicity rather
than a sharp transition driven solely by gas cooling.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:47:20 GMT"
}
] | 2011-02-11T00:00:00 | [
[
"Tumlinson",
"Jason",
"",
"Yale University"
]
] |
0707.0817 | Wei-shui Xu | Yi-hong Gao, Wei-shui Xu and Ding-fang Zeng | Viscosity and jet quenching from holographic model | 5 pages, minor changes and references added | null | null | null | hep-ph | null | We consider the backreaction of the fundamental flavor degrees of freedom on
the AdS$_5$-Schwarz background, and calculate their contributions to the shear
viscosity and jet-quenching parameter of the thermal quark-gluon plasma.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:01:13 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Sep 2007 14:57:23 GMT"
}
] | 2007-09-23T00:00:00 | [
[
"Gao",
"Yi-hong",
""
],
[
"Xu",
"Wei-shui",
""
],
[
"Zeng",
"Ding-fang",
""
]
] |
0707.0818 | Serguei Popov | Francis Comets, Serguei Popov, Marina Vachkovskaia | The number of open paths in an oriented $\rho$-percolation model | 30 pages, 2 figures | Journal of Statistical Physics, v. 131, p. 357-379, 2008 | 10.1007/s10955-008-9506-2 | null | math.PR | null | We study the asymptotic properties of the number of open paths of length $n$
in an oriented $\rho$-percolation model. We show that this number is
$e^{n\alpha(\rho)(1+o(1))}$ as $n \to \infty$. The exponent $\alpha$ is
deterministic, it can be expressed in terms of the free energy of a polymer
model, and it can be explicitely computed in some range of the parameters.
Moreover, in a restricted range of the parameters, we even show that the number
of such paths is $n^{-1/2} W e^{n\alpha(\rho)}(1+o(1))$ for some nondegenerate
random variable $W$. We build on connections with the model of directed
polymers in random environment, and we use techniques and results developed in
this context.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:50:06 GMT"
}
] | 2012-01-31T00:00:00 | [
[
"Comets",
"Francis",
""
],
[
"Popov",
"Serguei",
""
],
[
"Vachkovskaia",
"Marina",
""
]
] |
0707.0819 | Juan Carlos Su\'arez | J.C. Su\'arez (1,2), E. Michel (2), G. Houdek (3), F. P\'erez
Hern\'andez (4,5), Y. Lebreton (6) ((1) Instituto de Astrof\'isica de
Andaluc\'ia (CSIC) (2) LESIA, Observatoire de Paris-Meudon (3) Institute of
Astronomy, University of Cambridge (4) Instituto de Astrof\'isica de Canarias
(IAC) (5) Departamento de Astrof\'isica, Universidad de La Laguna (6) GEPI,
Observatoire de Paris-Meudon) | Asteroseismology of delta Scuti stars in open clusters: Praesepe | 6 pages, 1 figure. Accepted for publication in Communications in
Asteroseismology | null | 10.1553/cia151s39 | null | astro-ph | null | The present paper provides a general overview of the asteroseismic potential
of delta Scuti stars in clusters, in particular focusing on convection
diagnostics. We give a summarise of the last results obtained by the authors
for the Praesepe cluster of which five delta Scuti stars are analysed. In that
work, linear analysis is confronted with observations, using refined
descriptions for the effects of rotation on the determination of the global
stellar parameters and on the adiabatic oscillation frequency computations. A
single, complete, and coherent solution for all the selected stars is found,
which lead the authors to find important restrictions to the convection
description for a certain range of effective temperatures. Furthermore, the
method used allowed to give an estimate of the global parameters of the
selected stars and constrain the cluster.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 15:54:58 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Suárez",
"J. C.",
""
],
[
"Michel",
"E.",
""
],
[
"Houdek",
"G.",
""
],
[
"Hernández",
"F. Pérez",
""
],
[
"Lebreton",
"Y.",
""
]
] |
0707.0820 | Torsten Rudolf | T. Rudolf, Ch. Kant, F. Mayr, and A. Loidl | Magnetic-order induced phonon splitting in MnO from far-infrared
spectroscopy | 5 pages, 4 figures | Phys. Rev. B 77, 024421 (2008) | 10.1103/PhysRevB.77.024421 | null | cond-mat.str-el | null | Detailed far-infrared spectra of the optical phonons are reported for
antiferromagnetic MnO. Eigenfrequencies, phonon damping and effective plasma
frequencies are studied as a function of temperature. Special attention is paid
to the phonon splitting at the antiferromagnetic phase transition. The results
are compared to recent experimental and theoretical studies of the spin-phonon
coupling in frustrated magnets, which are explained in terms of a spin-driven
Jahn-Teller effect, and to ab initio and model calculations, which predict
phonon splitting induced by magnetic order.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:02:48 GMT"
},
{
"version": "v2",
"created": "Mon, 15 Oct 2007 13:51:27 GMT"
}
] | 2008-06-26T00:00:00 | [
[
"Rudolf",
"T.",
""
],
[
"Kant",
"Ch.",
""
],
[
"Mayr",
"F.",
""
],
[
"Loidl",
"A.",
""
]
] |
0707.0821 | Juan Carlos Su\'arez | J. C. Su\'arez (1,2), R. Garridol (1), A. Moya (1) ((1)Instituto de
Astrof\'isica de Andaluc\'ia (CSIC), (2) LESIA, Observatoire de Paris-Meudon) | Analysis of radial fundamental-to-first overtone period ratios in the
presence of near degeneracy | 5 pages,1 figure. Accepted for publication in Communications in
Asteroseismology | null | null | null | astro-ph | null | In the present work we provide the preliminary results obtained when
analysing the rotational Petersen diagrams when including the effects of near
degeneracy. We found that near degeneracy affects significantly the
fundamental-to-first overtone period ratios, showing wriggles in the Petersen
diagrams. Analysis of such wriggles reveals that they are mainly caused by the
avoided-crossing phenomenon. The size of wriggles seems to increase with the
rotational velocity and could, in certain cases, invalidate any accurate mass
and/or metallicity determinations. Nevertheless, deep analysis of near
degeneracy effects may allow us to obtain additional information on the mode
identification of the radial modes and their corresponding coupled pairs, which
would allow us to constrain the modelling.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:07:45 GMT"
}
] | 2016-08-14T00:00:00 | [
[
"Suárez",
"J. C.",
""
],
[
"Garridol",
"R.",
""
],
[
"Moya",
"A.",
""
]
] |
0707.0822 | Fran\c{c}ois Gautero | Francois Gautero and Martin Lustig | The mapping-torus of a free group automorphism is hyperbolic relative to
the canonical subgroups of polynomial growth | 40 pages, no figure. Differences with respect to the first version:
there is now an Appendix about $\beta$-train tracks, written by the second
author. A Corollary about Rapid Decay for free-by-cyclic groups has been
added | null | null | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the mapping torus group $\FN \rtimes_{\alpha} \Z$ of any
automorphism $\alpha$ of a free group $\FN$ of finite rank $n \geq 2$ is weakly
hyperbolic relative to the canonical (up to conjugation) family $\mathcal
H(\alpha)$ of subgroups of $\FN$ which consists of (and contains
representatives of all) conjugacy classes that grow polynomially under
iteration of $\alpha$. Furthermore, we show that $\FN \rtimes_{\alpha} \Z$ is
strongly hyperbolic relative to the mapping torus of the family $\mathcal
H(\alpha)$. As an application, we use a result of Drutu-Sapir to deduce that
$\FN \rtimes_{\alpha} \Z$ has Rapic Decay.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:11:00 GMT"
},
{
"version": "v2",
"created": "Sun, 26 Oct 2008 18:06:20 GMT"
}
] | 2008-10-26T00:00:00 | [
[
"Gautero",
"Francois",
""
],
[
"Lustig",
"Martin",
""
]
] |
0707.0823 | Xinjia Chen | Xinjia Chen, Kemin Zhou and Jorge L. Aravena | A Statistical Theory for the Analysis of Uncertain Systems | 32 pages, 15 figures | Proceeding of Joint Meeting of Statistics, pp. 1656--1663, Salt
Lake City, 2007 | null | null | stat.AP math.DS | null | This paper addresses the issues of conservativeness and computational
complexity of probabilistic robustness analysis. We solve both issues by
defining a new sampling strategy and robustness measure. The new measure is
shown to be much less conservative than the existing one. The new sampling
strategy enables the definition of efficient hierarchical sample reuse
algorithms that reduce significantly the computational complexity and make it
independent of the dimension of the uncertainty space. Moreover, we show that
there exists a one to one correspondence between the new and the existing
robustness measures and provide a computationally simple algorithm to derive
one from the other.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:12:32 GMT"
}
] | 2008-05-12T00:00:00 | [
[
"Chen",
"Xinjia",
""
],
[
"Zhou",
"Kemin",
""
],
[
"Aravena",
"Jorge L.",
""
]
] |
0707.0824 | Sergey Afonin | S. S. Afonin | Properties of new unflavored mesons below 2.4 GeV | 5 pages, to appear in Phys. Rev. C XX, 005200 (2007) | Phys.Rev.C76:015202,2007 | 10.1103/PhysRevC.76.015202 | null | hep-ph | null | The global features of spectrum of highly excited light nonstrange mesons can
be well understood within both chiral symmetry restoration scenario combined
with the relation $M^2\sim J+n$ and within nonrelativistic description based on
the relation $M^2\sim L+n$. The predictions of these two alternative
classifications for missing states are different and only future experiments
can distinguish between the two. We elaborate and compare systematically the
predictions of both schemes, which may serve as a suggestion for future
experiments devoted to the search for missing states.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:38:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Afonin",
"S. S.",
""
]
] |
0707.0825 | Alexei Deriglazov A | A. A. Deriglazov | Construction of Lagrangian local symmetries for general quadratic theory | null | Int.J.Mod.Phys.A22:2105-2118,2007 | 10.1142/S0217751X07035185 | null | hep-th math-ph math.MP | null | We propose a procedure which allows one to construct local symmetry
generators of general quadratic Lagrangian theory. Manifest recurrence
relations for generators in terms of so-called structure matrices of the Dirac
formalism are obtained. The procedure fulfilled in terms of initial variables
of the theory, and do not implies either separation of constraints on first and
second class subsets or any other choice of basis for constraints.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 19:20:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Deriglazov",
"A. A.",
""
]
] |
0707.0826 | Victor Malyshev | J. A. Klugkist, V. A. Malyshev, J. Knoester | Selection of dominant multi-exciton transitions in disordered linear
J-aggregates | 8 pages, 2 figures, accepted to Journal of Luminescence | J. Lumin.128, 945 (2008) | 10.1016/j.jlumin.2007.11.052 | null | cond-mat.dis-nn cond-mat.mtrl-sci | null | We show that the third-order optical response of disordered linear
J-aggregates can be calculated by considering only a limited number of
transitions between (multi-) exciton states. We calculate the pump-probe
absorption spectrum resulting from the truncated set of transitions and show
that, apart from the blue wing of the induced absorption peak, it agrees well
with the exact spectrum.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:29:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Klugkist",
"J. A.",
""
],
[
"Malyshev",
"V. A.",
""
],
[
"Knoester",
"J.",
""
]
] |
0707.0827 | Nikulov Alexey | Alexey Nikulov | Fundamental Differences Between Application of Basic Principles of
Quantum Mechanics on Atomic and Higher Levels | 3 pages, 1 figure, the talk was presented at the Eighth International
Symposium Frontiers of Fundamental Physics, Madrid, October 17-19, 2006 | in the AIP Conference Proceedings Vol. 905, p. 117 (2007) | 10.1063/1.2736996 | null | cond-mat.supr-con cond-mat.mes-hall | null | Superconductivity is macroscopic quantum phenomenon. From force of habit most
physicists pay no heed to a paradoxicality of this fact. Niels Bohr considered
quantum mechanics as atomic physics and the paradoxical quantum principles may
be admissible on this level. But they seem quite strange on the macroscopic
level. In the last years some experts, A. J. Leggett and other, attract our
attention to a contradiction between quantum mechanics and macroscopic realism.
In this paper I try to draw reader's attention to some paradoxical consequences
of the Bohr quantization on the macroscopic level.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:39:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nikulov",
"Alexey",
""
]
] |
0707.0828 | Xinjia Chen | Xinjia Chen, Kemin Zhou and Jorge L. Aravena | Probabilistic Robustness Analysis -- Risks, Complexity and Algorithms | 28 pages, 5 figures | Published in SIAM Journal on Control and Optimization, vol. 47,
pp. 2693--2723, 2008 | null | null | stat.AP math.ST stat.TH | null | It is becoming increasingly apparent that probabilistic approaches can
overcome conservatism and computational complexity of the classical worst-case
deterministic framework and may lead to designs that are actually safer. In
this paper we argue that a comprehensive probabilistic robustness analysis
requires a detailed evaluation of the robustness function and we show that such
evaluation can be performed with essentially any desired accuracy and
confidence using algorithms with complexity linear in the dimension of the
uncertainty space. Moreover, we show that the average memory requirements of
such algorithms are absolutely bounded and well within the capabilities of
today's computers.
In addition to efficiency, our approach permits control over statistical
sampling error and the error due to discretization of the uncertainty radius.
For a specific level of tolerance of the discretization error, our techniques
provide an efficiency improvement upon conventional methods which is inversely
proportional to the accuracy level; i.e., our algorithms get better as the
demands for accuracy increase.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:42:21 GMT"
}
] | 2008-11-01T00:00:00 | [
[
"Chen",
"Xinjia",
""
],
[
"Zhou",
"Kemin",
""
],
[
"Aravena",
"Jorge L.",
""
]
] |
0707.0829 | Jean-Francois Bony | Jean-Francois Bony | Mesures limites pour l'equation de Helmholtz dans le cas non captif | 27 pages, 7 figures | null | null | null | math.AP math.FA | null | Cet article est consacre a l'etude des mesures limites associees a la
solution de l'equation de Helmholtz avec un terme source se concentrant en un
point. Le potentiel est suppose regulier et l'operateur non-captif. La solution
de l'equation de Schrodinger semi-classique s'ecrit alors micro-localement
comme somme finie de distributions lagrangiennes.
Sous une hypothese geometrique, qui generalise l'hypothese du viriel, on en
deduit que la mesure limite existe et qu'elle verifie des proprietes standard.
Enfin, on donne un exemple d'operateur qui ne verifie pas l'hypothese
geometrique et pour lequel la mesure limite n'est pas unique. Le cas de deux
termes sources est aussi traite.
| [
{
"version": "v1",
"created": "Thu, 5 Jul 2007 16:45:04 GMT"
}
] | 2007-07-06T00:00:00 | [
[
"Bony",
"Jean-Francois",
""
]
] |
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