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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.0414 | Sandro Wimberger | Sandro Wimberger, Donatella Ciampini, Oliver Morsch, Riccardo
Mannella, and Ennio Arimondo | Engineered quantum tunnelling in extended periodic potentials | 6 pp, proceedings DICE 11-15 September 2006, Castello di Piombino,
Tuscany, Italy | 2007 J. Phys.: Conf. Ser. 67 012060 (6pp) | 10.1088/1742-6596/67/1/012060 | null | cond-mat.other | null | Quantum tunnelling from a tilted, but otherwise periodic potential is
studied. Our theoretical and experimental results show that, by controlling the
system's parameters, we can engineer the escape rate of a Bose-Einstein
condensate to an exceptional degree. Possible applications of this atom-optics
realization of the open Wannier-Stark system are discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:33:57 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Wimberger",
"Sandro",
""
],
[
"Ciampini",
"Donatella",
""
],
[
"Morsch",
"Oliver",
""
],
[
"Mannella",
"Riccardo",
""
],
[
"Arimondo",
"Ennio",
""
]
] |
0706.0415 | Andre Martinez | Andre' Martinez, Shu Nakamura, Vania Sordoni | Analytic wave front set for solutions to Schroedinger equation | 32 pages | null | null | null | math.AP math-ph math.MP | null | This paper is a continuation of a previous paper by the same authors, where
an analytic smoothing effect was proved for long-range type perturbations of
the Laplacian $H_0$ on $\re^n$. In this paper, we consider short-range type
perturbations $H$ of the Laplacian on $\re^n$, and we characterize the analytic
wave front set of the solution to the Schr\"odinger equation:
$e^{-itH}f$, in terms of that of the free solution: $e^{-itH_0}f$, for $t<0$
in the forward nontrapping region. The same result holds for $t>0$ in the
backward nontrapping region. This result is an analytic analogue of results by
Hassel and Wunsch and Nakamura.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 11:49:20 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Martinez",
"Andre'",
""
],
[
"Nakamura",
"Shu",
""
],
[
"Sordoni",
"Vania",
""
]
] |
0706.0416 | Betti Hartmann | Marieke Postma (NIKHEF, The Netherlands) and Betti Hartmann (LMPT
Tours, France) | Zero modes on cosmic string loops | 27 pages including 4 eps figures | null | null | null | hep-th hep-ph | null | We study the spectrum of fermionic modes on cosmic string loops. We find no
fermionic zero modes nor massive bound states - this implies that vortons
stabilized by fermionic currents do not exist. We have also studied
kink-(anti)kink and vortex-(anti)vortex systems and find that all systems that
have vanishing net topological charge do not support fermionic bound modes.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 11:58:43 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Postma",
"Marieke",
"",
"NIKHEF, The Netherlands"
],
[
"Hartmann",
"Betti",
"",
"LMPT\n Tours, France"
]
] |
0706.0417 | Perret Marc | Emmanuel Hallouin, Marc Perret | On the kernel of the norm in some unramified number fields extensions | 6 pages | null | null | null | math.NT | null | We determine the -1 Tate cohomology group of the units for principal abelian
extensions of type (p^a, p^b) of a number field.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 11:59:55 GMT"
}
] | 2011-02-19T00:00:00 | [
[
"Hallouin",
"Emmanuel",
""
],
[
"Perret",
"Marc",
""
]
] |
0706.0418 | Oscar Sotolongo | O. Sotolongo-Grau, D. Rodriguez-Perez, J. A. Santos-Miranda, O.
Sotolongo-Costa, J. C. Antoranz | Immune System -- Tumor Efficiency Rate as a new Oncological Index for
Radiotherapy Treatment Optimization | 10 pages, 3 figures | null | null | null | q-bio.PE | null | A dynamical system model for tumor -- immune system interaction together with
a method to mimic radiation therapy are proposed. A large population of virtual
patients is simulated following an ideal radiation treatment. A characteristic
parameter, the Immune System -- Tumor Efficiency Rate (ISTER), is introduced.
ISTER dependence of treatment success and other features is studied.
Statistical results allow us to give a patient classification scheme.
Radiotherapy treatment biological effective dose (BED) is thus optimized based
on the patient physical condition, following the ALARA (As Low As Reasonably
Achievable) criterion.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:11:44 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 10:59:22 GMT"
}
] | 2007-06-28T00:00:00 | [
[
"Sotolongo-Grau",
"O.",
""
],
[
"Rodriguez-Perez",
"D.",
""
],
[
"Santos-Miranda",
"J. A.",
""
],
[
"Sotolongo-Costa",
"O.",
""
],
[
"Antoranz",
"J. C.",
""
]
] |
0706.0419 | Ernesto S. Loscar | Ernesto S. Loscar and Ezequiel V. Albano | Critical Behaviour of Irreversible Reaction Systems | 56 pages, 18 figures | Rep. Prog. Phys. 66 (2003) 1-40 | null | null | cond-mat.stat-mech | null | An introductory review on the critical behaviour of some irreversible
reaction systems is given. The study of these systems has attracted great
attention during the last decades due to, on the one hand, the rich and complex
underlying physics, and on the other hand, their relevance for numerous
technological applications in heterogeneous catalysis, corrosion and coating,
development of microelectronic devices, etc. The review is focuses on recent
advances in the understanding of irreversible phase transitions (IPT's)
providing a survey of the theoretical development of the field during the last
decade, as well as a detailed discussion of relevant numerical simulations. The
Langevin formulation for the treatment of second-order IPT's is discussed.
Different Monte Carlo approaches are also presented in detail and the
finite-size scaling analysis of second-order IPT's is described. Special
attention is devoted to the description of recent progress in the study of
first-order IPT's observed upon catalytic oxidation of carbon monoxide and the
reduction of nitrogen monoxide, using lattice gas reaction models. Only brief
comments are given on other reactions such as the oxidation of hydrogen,
ammonia synthesis, etc. Also, a discussion of relevant experiments is presented
and measurement are compared with the numerical results. Furthermore, promising
areas for further research and open questions are also addressed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:03:32 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Loscar",
"Ernesto S.",
""
],
[
"Albano",
"Ezequiel V.",
""
]
] |
0706.0420 | Toni Schneider | T. Schneider | Magnetic field induced 3D to 1D crossover in Sr0:9La0:1CuO2 | 4 pages, 5 figures | null | 10.1209/0295-5075/79/57005 | null | cond-mat.supr-con | null | The effect of the magnetic field on the critical behavior of Sr0:9La0:1CuO2
is explored in terms of reversible magnetization data. As the correlation
length transverse to the magnetic field Hi,applied along the i-axis, cannot
grow beyond the limiting magnetic length LHi, related to the average distance
between vortex lines, one expects a magnetic field induced finite size effect.
Invoking the scaling theory of critical phenomena we provide clear evidence for
this effect. It implies that in type II superconductors there is a 3D to 1D
crossover line Hpi(T). Consequently, below Tc and above Hpi(T) uperconductivity
is confined to cylinders with diameter LHi(1D). Accordingly, there is no
continuous phase transition in the (H,T)-plane along the Hc2-lines as predicted
by the mean-field treatment.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:16:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schneider",
"T.",
""
]
] |
0706.0421 | Oliver Schn\"urer | Oliver C. Schn\"urer, Felix Schulze, and Miles Simon | Stability of Euclidean space under Ricci flow | 24 pages | null | null | null | math.DG math.AP | null | We study the Ricci flow for initial metrics which are C^0 small perturbations
of the Euclidean metric on R^n. In the case that this metric is asymptotically
Euclidean, we show that a Ricci harmonic map heat flow exists for all times,
and converges uniformly to the Euclidean metric as time approaches infinity. In
proving this stability result, we introduce a monotone integral quantity which
measures the deviation of the evolving metric from the Euclidean metric. We
also investigate the convergence of the diffeomorphisms relating Ricci harmonic
map heat flow to Ricci flow.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:10:43 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Schnürer",
"Oliver C.",
""
],
[
"Schulze",
"Felix",
""
],
[
"Simon",
"Miles",
""
]
] |
0706.0422 | Victor S. L'vov | Victor S. L'vov and Anna Pomyalov (Dept of Chemical Physics, Weizmann
Inst. of Sci., Rehovot, Israel), Antonino Ferrante and Said Elghobashi (Dept.
of Mechanical and Aerospace Engineering, Univ. of California, Irvine, USA) | Analytical Model of the Time Developing Turbulent Boundary Layer | 5pages, 9 figs, JETP Letters, submitted | null | 10.1134/S002136400714007X | null | nlin.CD | null | We present an analytical model for the time-developing turbulent boundary
layer (TD-TBL) over a flat plate. The model provides explicit formulae for the
temporal behavior of the wall-shear stress and both the temporal and spatial
distributions of the mean streamwise velocity, the turbulence kinetic energy
and Reynolds shear stress. The resulting profiles are in good agreement with
the DNS results of spatially-developing turbulent boundary layers at momentum
thickness Reynolds number equal to 1430 and 2900. Our analytical model is, to
the best of our knowledge, the first of its kind for TD-TBL.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:23:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"L'vov",
"Victor S.",
"",
"Dept of Chemical Physics, Weizmann\n Inst. of Sci., Rehovot, Israel"
],
[
"Pomyalov",
"Anna",
"",
"Dept of Chemical Physics, Weizmann\n Inst. of Sci., Rehovot, Israel"
],
[
"Ferrante",
"Antonino",
"",
"Dept.\n of Mechanical and Aerospace Engineering, Univ. of California, Irvine, USA"
],
[
"Elghobashi",
"Said",
"",
"Dept.\n of Mechanical and Aerospace Engineering, Univ. of California, Irvine, USA"
]
] |
0706.0423 | Simon Anders | Simon Anders, Hans J. Briegel, Wolfgang D\"ur | A variational method based on weighted graph states | 36 pages, 13 figures | New J. Phys. 9 (2007) 361 | 10.1088/1367-2630/9/10/361 | null | quant-ph | null | In a recent article [Phys. Rev. Lett. 97 (2006), 107206], we have presented a
class of states which is suitable as a variational set to find ground states in
spin systems of arbitrary spatial dimension and with long-range entanglement.
Here, we continue the exposition of our technique, extend from spin 1/2 to
higher spins and use the boson Hubbard model as a non-trivial example to
demonstrate our scheme.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:39:33 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 12:39:15 GMT"
}
] | 2007-10-06T00:00:00 | [
[
"Anders",
"Simon",
""
],
[
"Briegel",
"Hans J.",
""
],
[
"Dür",
"Wolfgang",
""
]
] |
0706.0424 | Michael Thies | Felix Karbstein, Michael Thies | Divergence of the axial current and fermion density in Gross-Neveu
models | 7 pages, no figure; v2: minor changes, reference added | Phys.Rev.D76:085009,2007 | 10.1103/PhysRevD.76.085009 | FAU-TP3-07/03 | hep-th hep-lat hep-ph | null | The divergence of the axial current is used to relate the spatial derivative
of the fermion density to the bare fermion mass and scalar/pseudoscalar
condensates in 1+1 dimensional Gross-Neveu models. This serves as a novel test
of known results, to explain simple features of the continuous chiral model and
to resolve a conflict concerning the assignment of baryon number to certain
multi-fermion bound states.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:41:54 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 08:12:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Karbstein",
"Felix",
""
],
[
"Thies",
"Michael",
""
]
] |
0706.0425 | Joerg Evers | M. Kiffner, M. S. Zubairy, J. Evers and C. H. Keitel | Two-mode single-atom laser as a source of entangled light | null | Phys. Rev. A 75, 033816 (2007) | 10.1103/PhysRevA.75.033816 | null | quant-ph | null | A two-mode single-atom laser is considered, with the aim of generating
entanglement in macroscopic light. Two transitions in the four-level gain
medium atom independently interact with the two cavity modes, while two other
transitions are driven by control laser fields. Atomic relaxation as well as
cavity losses are taken into account. We show that this system is a source of
macroscopic entangled light over a wide range of control parameters and initial
states of the cavity field.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 12:47:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kiffner",
"M.",
""
],
[
"Zubairy",
"M. S.",
""
],
[
"Evers",
"J.",
""
],
[
"Keitel",
"C. H.",
""
]
] |
0706.0426 | Antonio Maria Scarfone | A. Lavagno, A.M. Scarfone and P. Narayana Swamy | Basic-deformed thermostatistics | 23 pages, 2 fugures, Accepted on J. Phys. A: Math. Gen | J.Phys.A40:8635-8654,2007 | 10.1088/1751-8113/40/30/003 | null | cond-mat.stat-mech math-ph math.MP math.QA nucl-th | null | Starting from the basic-exponential, a q-deformed version of the exponential
function established in the framework of the basic-hypergeometric series, we
present a possible formulation of a generalized statistical mechanics. In a
q-nonuniform lattice we introduce the basic-entropy related to the
basic-exponential by means of a q-variational principle. Remarkably, this
distribution exhibits a natural cut-off in the energy spectrum. This fact,
already encountered in other formulations of generalized statistical mechanics,
is expected to be relevant to the applications of the theory to those systems
governed by long-range interactions. By employing the q-calculus, it is shown
that the standard thermodynamic functional relationships are preserved,
mimicking, in this way, the mathematical structure of the ordinary
thermostatistics which is recovered in the q=1 limit.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:07:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lavagno",
"A.",
""
],
[
"Scarfone",
"A. M.",
""
],
[
"Swamy",
"P. Narayana",
""
]
] |
0706.0427 | Jidong Zhong | Jidong Zhong | Watermark Embedding and Detection | PhD Dissertation (157 pages), Shanghai Jiaotong Universtiy, 2007 | null | null | null | cs.MM cs.CR | null | The embedder and the detector (or decoder) are the two most important
components of the digital watermarking systems. Thus in this work, we discuss
how to design a better embedder and detector (or decoder). I first give a
summary of the prospective applications of watermarking technology and major
watermarking schemes in the literature. My review on the literature closely
centers upon how the side information is exploited at both embedders and
detectors. In Chapter 3, I explore the optimum detector or decoder according to
a particular probability distribution of the host signals. We found that the
performance of both multiplicative and additive spread spectrum schemes depends
on the shape parameter of the host signals. For spread spectrum schemes, the
performance of the detector or the decoder is reduced by the host interference.
Thus I present a new host-interference rejection technique for the
multiplicative spread spectrum schemes. Its embedding rule is tailored to the
optimum detection or decoding rule. Though the host interference rejection
schemes enjoy a big performance gain over the traditional spread spectrum
schemes, their drawbacks that it is difficult for them to be implemented with
the perceptual analysis to achieve the maximum allowable embedding level
discourage their use in real scenarios. Thus, in the last chapters of this
work, I introduce a double-sided technique to tackle this drawback. It differs
from the host interference rejection schemes in that it utilizes but does not
reject the host interference at its embedder. The perceptual analysis can be
easily implemented in our scheme to achieve the maximum allowable level of
embedding strength.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 05:37:34 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Zhong",
"Jidong",
""
]
] |
0706.0428 | Vincent Leon | Felix Fernandez-Alonso (ISIS), F. Javier Bermejo, Carlos Cabrillo,
Raouf O. Loutfy, Vincent Leon (CRMD), Marie-Louise Saboungi (CRMD) | Nature of the bound states of molecular hydrogen in carbon nanohorns | 4 pages | Physical Review Letters 98, 21 (25/05/2007) 215503 | 10.1103/PhysRevLett.98.215503 | null | cond-mat.mtrl-sci | null | The effects of confining molecular hydrogen within carbon nanohorns are
studied via high-resolution quasielastic and inelastic neutron spectroscopies.
Both sets of data are remarkably different from those obtained in bulk samples
in the liquid and crystalline states. At temperatures where bulk hydrogen is
liquid, the spectra of the confined sample show an elastic component indicating
a significant proportion of immobile molecules as well as distinctly narrower
quasielastic line widths and a strong distortion of the line shape of the para
- ortho rotational transition. The results show that hydrogen interacts far
more strongly with such carbonous structures than it does to carbon nanotubes,
suggesting that nanohorns and related nanostructures may offer significantly
better prospects as lightweight media for hydrogen storage applications.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:05:20 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Fernandez-Alonso",
"Felix",
"",
"ISIS"
],
[
"Bermejo",
"F. Javier",
"",
"CRMD"
],
[
"Cabrillo",
"Carlos",
"",
"CRMD"
],
[
"Loutfy",
"Raouf O.",
"",
"CRMD"
],
[
"Leon",
"Vincent",
"",
"CRMD"
],
[
"Saboungi",
"Marie-Louise",
"",
"CRMD"
]
] |
0706.0429 | Alexey Shutov | A.V. Shutov, R. Kreissig | Finite strain viscoplasticity with nonlinear kinematic hardening:
phenomenological modeling and time integration | 29 pages, 7 figures | Computer Methods in Applied Mechanics and Engineering, 197 (2008)
2015-2029 | 10.1016/j.cma.2007.12.017 | null | math.NA | null | This article deals with a viscoplastic material model of overstress type. The
model is based on a multiplicative decomposition of the deformation gradient
into elastic and inelastic part. An additional multiplicative decomposition of
inelastic part is used to describe a nonlinear kinematic hardening of
Armstrong-Frederick type.
Two implicit time-stepping methods are adopted for numerical integration of
evolution equations, such that the plastic incompressibility constraint is
exactly satisfied. The first method is based on the tensor exponential. The
second method is a modified Euler-Backward method. Special numerical tests show
that both approaches yield similar results even for finite inelastic
increments.
The basic features of the material response, predicted by the material model,
are illustrated with a series of numerical simulations.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:08:58 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Shutov",
"A. V.",
""
],
[
"Kreissig",
"R.",
""
]
] |
0706.0430 | Shishir Nagaraja | Shishir Nagaraja | Anonymity in the Wild: Mixes on unstructured networks | published in Privacy Enhancing Technologies 2007, Ottawa | null | null | null | cs.CR cs.NI | null | As decentralized computing scenarios get ever more popular, unstructured
topologies are natural candidates to consider running mix networks upon. We
consider mix network topologies where mixes are placed on the nodes of an
unstructured network, such as social networks and scale-free random networks.
We explore the efficiency and traffic analysis resistance properties of mix
networks based on unstructured topologies as opposed to theoretically optimal
structured topologies, under high latency conditions. We consider a mix of
directed and undirected network models, as well as one real world case study --
the LiveJournal friendship network topology. Our analysis indicates that
mix-networks based on scale-free and small-world topologies have, firstly,
mix-route lengths that are roughly comparable to those in expander graphs;
second, that compromise of the most central nodes has little effect on
anonymization properties, and third, batch sizes required for warding off
intersection attacks need to be an order of magnitude higher in unstructured
networks in comparison with expander graph topologies.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:11:07 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Nagaraja",
"Shishir",
""
]
] |
0706.0431 | Wolfgang Steiner | Emilie Charlier, Michel Rigo, Wolfgang Steiner (LIAFA) | Abstract numeration systems on bounded languages and multiplication by a
constant | null | Integers: Electronic Journal of Combinatorial Number Theory 8, 1
(2008) #35 | null | null | cs.DM math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A set of integers is $S$-recognizable in an abstract numeration system $S$ if
the language made up of the representations of its elements is accepted by a
finite automaton. For abstract numeration systems built over bounded languages
with at least three letters, we show that multiplication by an integer
$\lambda\ge2$ does not preserve $S$-recognizability, meaning that there always
exists a $S$-recognizable set $X$ such that $\lambda X$ is not
$S$-recognizable. The main tool is a bijection between the representation of an
integer over a bounded language and its decomposition as a sum of binomial
coefficients with certain properties, the so-called combinatorial numeration
system.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:12:37 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Sep 2008 10:13:27 GMT"
}
] | 2008-09-16T00:00:00 | [
[
"Charlier",
"Emilie",
"",
"LIAFA"
],
[
"Rigo",
"Michel",
"",
"LIAFA"
],
[
"Steiner",
"Wolfgang",
"",
"LIAFA"
]
] |
0706.0432 | Vyacheslav Rychkov | Riccardo Barbieri, Brando Bellazzini, Vyacheslav S. Rychkov, Alvise
Varagnolo | The Higgs boson from an extended symmetry | 22 pp; v3: Small corrections, version to be published in Phys. Rev. D | Phys.Rev.D76:115008,2007 | 10.1103/PhysRevD.76.115008 | null | hep-ph | null | The variety of ideas put forward in the context of a "composite" picture for
the Higgs boson calls for a simple and effective description of the related
phenomenology. Such a description is given here by means of a "minimal" model
and is explicitly applied to the example of a Higgs-top sector from an SO(5)
symmetry. We discuss the spectrum, the ElectroWeak Precision Tests, B-physics
and naturalness. We show the difficulty to comply with the different
constraints. The extended gauge sector relative to the standard SU(2)xU(1), if
there is any, has little or no impact on these considerations. We also discuss
the relation of the "minimal" model with its "little Higgs" or "holographic"
extensions based on the same symmetry.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:56:42 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 15:13:46 GMT"
},
{
"version": "v3",
"created": "Sun, 7 Oct 2007 16:47:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Bellazzini",
"Brando",
""
],
[
"Rychkov",
"Vyacheslav S.",
""
],
[
"Varagnolo",
"Alvise",
""
]
] |
0706.0433 | Nelson Vieira | P. Cerejeiras, N. Faustino and N. Vieira | Numerical Clifford Analysis for Nonlinear Schrodinger Problem | This article has 6 figures. This article has benn accepted for
publication in the Journal of Numerical Methods for Partial Differential
Equations | Numerical Methods for Partial Differential Equations, Vol. 24,
no.4, 2008, 1181 - 1202 | 10.1002/num.20312 | null | math.NA math.CV | null | The aim of this work is to study the numerical solution of the nonlinear
Schrodinger problem using a combination between Witt basis and finite
difference approximations. We construct a discrete fundamental solution for the
non-stationary Schrodinger operator and we show the convergence of the
numerical scheme. Numerical examples are given at the end of the paper.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:23:18 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Dec 2007 01:10:59 GMT"
}
] | 2011-02-17T00:00:00 | [
[
"Cerejeiras",
"P.",
""
],
[
"Faustino",
"N.",
""
],
[
"Vieira",
"N.",
""
]
] |
0706.0434 | Sven Van Loo | S. Van Loo, S.A.E.G. Falle, T.W. Hartquist and T.J.T. Moore | Shock-triggered formation of magnetically-dominated clouds | 7 pages, 6 figures, accepted by Astronomy and Astrophysics | null | 10.1051/0004-6361:20077430 | null | astro-ph | null | To understand the formation of a magnetically dominated molecular cloud out
of an atomic cloud, we follow the dynamical evolution of the cloud with a
time-dependent axisymmetric magnetohydrodynamic code. A thermally stable warm
atomic cloud is initially in static equilibrium with the surrounding hot
ionised gas. A shock propagating through the hot medium interacts with the
cloud. As a fast-mode shock propagates through the cloud, the gas behind it
becomes thermally unstable. The $\beta$ value of the gas also becomes much
smaller than the initial value of order unity. These conditions are ideal for
magnetohydrodynamic waves to produce high-density clumps embedded in a rarefied
warm medium. A slow-mode shock follows the fast-mode shock. Behind this shock a
dense shell forms, which subsequently fragments. This is a primary region for
the formation of massive stars. Our simulations show that only weak and
moderate-strength shocks can form cold clouds which have properties typical of
giant molecular clouds.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:23:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Van Loo",
"S.",
""
],
[
"Falle",
"S. A. E. G.",
""
],
[
"Hartquist",
"T. W.",
""
],
[
"Moore",
"T. J. T.",
""
]
] |
0706.0435 | Nicola Arcozzi | N. Arcozzi, R. Rochberg, E. Sawyer | Carleson Measures for the Drury-Arveson Hardy space and other
Besov-Sobolev spaces on Complex Balls | null | null | null | null | math.CV math.OA | null | We characterize the Carleson measures for the Drury-Arveson Hardy space and
other Hilbert spaces of analytic functions of several complex variables. This
provides sharp estimates for Drury's generalization of Von Neumann's
inequality. The characterization is in terms of a geometric condition, the
"split tree condition", which reflects the nonisotropic geometry underlying the
Drury-Arveson Hardy space.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:27:38 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Arcozzi",
"N.",
""
],
[
"Rochberg",
"R.",
""
],
[
"Sawyer",
"E.",
""
]
] |
0706.0436 | Ivan Santamaria-Holek | R. F. Rodriguez, I. Santamaria-Holek | Superstatistics of Brownian motion: A comparative study | 14 pages,5 figures | null | 10.1016/j.physa.2007.06.040 | null | cond-mat.stat-mech | null | The dynamics of temperature fluctuations of a gas of Brownian particles in
local equilibrium with a nonequilibrium heat bath, are described using an
approach consistent with Boltzmann-Gibbs statistics (BG). We use mesoscopic
nonequilibrium thermodynamics (MNET) to derive a Fokker-Planck equation for the
probability distribution in phase space including the local intensive variables
fluctuations. We contract the description to obtain an effective probability
distribution (EPD) from which the mass density, van Hove's function and the
dynamic structure factor of the system are obtained. The main result is to show
that in the long time limit the EPD exhibits a similar behavior as the
superstatistics distribution of nonextensive statistical mechanics (NESM),
therfore implying that the coarse-graining procedure is responsible for the so
called nonextensive effects.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:27:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rodriguez",
"R. F.",
""
],
[
"Santamaria-Holek",
"I.",
""
]
] |
0706.0437 | Nathaniel Tagg | MINOS Collaboration: P. Adamson, et al | Measurement of neutrino velocity with the MINOS detectors and NuMI
neutrino beam | 6 pages, 3 figures, to be submitted to PRD. Added discussion and
expanded text | Phys.Rev.D76:072005,2007 | 10.1103/PhysRevD.76.072005 | MINOS DocDB 2582, FNAL PUB-07-153-E | hep-ex | null | The velocity of a ~3 GeV neutrino beam is measured by comparing detection
times at the Near and Far detectors of the MINOS experiment, separated by 734
km. A total of 473 Far Detector neutrino events was used to measure (v-c)/c =
5.1 +/- 2.9 x 10^-5 (at 68% C.L.). By correlating the measured energies of 258
charged-current neutrino events to their arrival times at the Far Detector, a
limit is imposed on the neutrino mass of m_nu < 50 MeV/c^2 (99% C.L.).
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:47:30 GMT"
},
{
"version": "v2",
"created": "Tue, 3 Jul 2007 16:08:04 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Aug 2007 16:47:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"MINOS Collaboration",
"",
""
],
[
"Adamson",
"P.",
""
]
] |
0706.0438 | Igor Rychkov | Igor Rychkov and Debra J. Searles | Isoconfigurational thermostat | 3 pages, submitting to the PRL | null | null | null | cond-mat.stat-mech | null | A holonomic constraint is used to enforce a constant instantaneous
configurational temperature on an equilibrium system. Three sets of equations
of motion are obtained, differing according to the way in which the holonomic
constraint is introduced and the phase space distribution function that is
preserved by the dynamics. Firstly, Gauss' principle of least constraint is
used, and it is shown that it does not preserve the canonical distribution.
Secondly, a modified Hamiltonian is used to find a dynamics that provides a
restricted microcanonical distribution. Lastly, we provide equations that are
specifically designed to both satisfy the temperature constraint and produce a
restricted canonical ensemble.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:55:09 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 12:02:07 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Rychkov",
"Igor",
""
],
[
"Searles",
"Debra J.",
""
]
] |
0706.0439 | Douglas E. MacLaughlin | D. E. MacLaughlin, Lei Shu, R. H. Heffner, J.E. Sonier, F. D.
Callaghan, G. D. Morris, O. O. Bernal, W. M. Yuhasz, N. A. Frederick, M. B.
Maple | Multiband superconductivity and penetration depth in PrOs4Sb12 | 2 pages, 2 figures, submitted for publication in Proc. Int. Conf. on
Strongly Correlated Electron Systems, Houston, May 2007 | null | 10.1016/j.physb.2007.10.329 | null | cond-mat.supr-con cond-mat.str-el | null | The effective superconducting penetration depth measured in the vortex state
of PrOs4Sb12 using transverse-field muon spin rotation (TF-muSR) exhibits an
activated temperature dependence at low temperatures, consistent with a nonzero
gap for quasiparticle excitations. In contrast, Meissner-state radiofrequency
(rf) inductive measurements of the penetration depth yield a T^2 temperature
dependence, suggestive of point nodes in the gap. A scenario based on the
recent discovery of extreme two-band superconductivity in PrOs4Sb12 is proposed
to resolve this difference. In this picture a large difference between large-
and small-gap coherence lengths renders the field distribution in the vortex
state controlled mainly by supercurrents from a fully-gapped large-gap band. In
zero field all bands contribute, yielding a stronger temperature dependence to
the rf inductive measurements.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:11:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"MacLaughlin",
"D. E.",
""
],
[
"Shu",
"Lei",
""
],
[
"Heffner",
"R. H.",
""
],
[
"Sonier",
"J. E.",
""
],
[
"Callaghan",
"F. D.",
""
],
[
"Morris",
"G. D.",
""
],
[
"Bernal",
"O. O.",
""
],
[
"Yuhasz",
"W. M.",
""
],
[
"Frederick",
"N. A.",
""
],
[
"Maple",
"M. B.",
""
]
] |
0706.0440 | Michel Cotsaftis | Michel Cotsaftis (LTME/ECE, Paris, France) | What Makes a System Complex? an Approach to Self-Organization and
Emergence | 25 pages, 8 figures, to appear in Springer Series "Understanding
Complex Systems". Version 2 with corrected eqn(1) | null | null | null | nlin.AO | null | The fast changing reality in technical and natural domains perceived by
always more accurate observations has drawn attention on new and very broad
class of systems with specific behaviour represented under the common wording
complexity. From elementary system graph representation with components as
nodes and interactions as vertices, systems are shown to belong to only three
states : simple, complicated, and complex, the main properties of which are
discussed. The first two states have been studied at length over past
centuries, and last one finds its origin in the elementary fact that when
system performance is pushed up, there exists a threshold above which
interaction between components overtake outside interaction. Then system
self-organizes and filters corresponding outer action, making it more robust to
outer effect, with emergence of new behaviour not predictable from only
components study. Examples in Physics and Biology are given. Three main classes
of complexity behaviour are distinguished corresponding to different grades of
difficulty to handle their dynamics. The interest of using complex state
properties in man-made systems is stressed. Important issues concentrating on
the difficult balance between relative system isolation when becoming complex
and required delegation of corresponding new capability from (outside) operator
are discussed. This implies giving the system some intelligence in an adequate
frame between new augmented system state and supervising operator, with
consequences on canonical system triplet {effector-sensor-controller} to be
reorganized in this new setting. Moreover, entering complexity state opens the
possibility for function to feedback onto structure, ie to mimic at technical
level the invention of Nature over Her very long history.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:06:08 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 11:40:01 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Cotsaftis",
"Michel",
"",
"LTME/ECE, Paris, France"
]
] |
0706.0441 | Kai Wang | Tao Han, Biswarup Mukhopadhyaya, Zongguo Si and Kai Wang | Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and
Signals at the LHC | revtex4, 23 pages, 14 figures, version published in Physical Review D | Phys.Rev.D76:075013,2007 | 10.1103/PhysRevD.76.075013 | MADPH-07-1488,HRI-P-07-05-001 | hep-ph | null | We study the pair production of doubly charged Higgs bosons at the Large
Hadron Collider (LHC), assuming the doubly charged Higgs to be part of an
SU(2)_L triplet which generates Majorana masses for left-handed neutrinos. Such
pair-production has the advantage that it is not constrained by the triplet
vacuum expectation value, which tends to make the single production rate rather
small. We point out that, in addition to the Drell-Yan (DY) production
mechanism, two-photon processes also contribute to H++H++ production at a level
comparable to the QCD corrections to the DY channel. Decays of the doubly
charged Higgs into both the l+l+ and W+W+ modes are studied in detail to
optimize the signal observation over the backgrounds. Doubly charged scalars
should be observable at the LHC with 300 fb^-1 integrated luminosity in the ll
channel upto the mass range of 1 TeV even with a branching fraction of about 60
%, and in the WW channel upto a mass of 700 GeV. Such a doubly charged Higgs,
if it is a member of a triplet generating neutrino masses,cannot be long-lived
on the scale of collider detectors although it might lead to a displaced
secondary vertex during its decay if it is lighter than about 250 GeV.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:10:01 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 00:12:50 GMT"
},
{
"version": "v3",
"created": "Wed, 15 Aug 2007 16:54:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Han",
"Tao",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Si",
"Zongguo",
""
],
[
"Wang",
"Kai",
""
]
] |
0706.0442 | Nikolay Bobev | N.P. Bobev and R.C. Rashkov | Spiky Strings, Giant Magnons and beta-deformations | 20 pages, 2 figures; v2: typos corrected, references added | Phys.Rev.D76:046008,2007 | 10.1103/PhysRevD.76.046008 | null | hep-th | null | We study rigid string solutions rotating on the S^3 subspace of the
beta-deformed AdS_5xS^5 background found by Lunin and Maldacena. For particular
values of the parameters of the solutions we find the known giant magnon and
single spike strings. We present a single spike string solution on the deformed
S^3 and find how the deformation affects the dispersion relation. The possible
relation of this string solution to spin chains and the connection of the
solutions on the undeformed S^3 to the sine-Gordon model are briefly discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:10:44 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jun 2007 00:11:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bobev",
"N. P.",
""
],
[
"Rashkov",
"R. C.",
""
]
] |
0706.0443 | Nataliya Ivanova | Roman O. Popovych, Michael Kunzinger and Nataliya M. Ivanova | Conservation Laws and Potential Symmetries of Linear Parabolic Equations | 67 pages, minor corrections | Acta Appl. Math., 2008, V.100, 113-185 | 10.1007/s10440-007-9178-y | null | math-ph math.MP | null | We carry out an extensive investigation of conservation laws and potential
symmetries for the class of linear (1+1)-dimensional second-order parabolic
equations. The group classification of this class is revised by employing
admissible transformations, the notion of normalized classes of differential
equations and the adjoint variational principle. All possible potential
conservation laws are described completely. They are in fact exhausted by local
conservation laws. For any equation from the above class the characteristic
space of local conservation laws is isomorphic to the solution set of the
adjoint equation. Effective criteria for the existence of potential symmetries
are proposed. Their proofs involve a rather intricate interplay between
different representations of potential systems, the notion of a potential
equation associated with a tuple of characteristics, prolongation of the
equivalence group to the whole potential frame and application of multiple dual
Darboux transformations. Based on the tools developed, a preliminary analysis
of generalized potential symmetries is carried out and then applied to
substantiate our construction of potential systems. The simplest potential
symmetries of the linear heat equation, which are associated with single
conservation laws, are classified with respect to its point symmetry group.
Equations possessing infinite series of potential symmetry algebras are studied
in detail.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:39:36 GMT"
},
{
"version": "v2",
"created": "Fri, 9 Nov 2007 15:39:24 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Mar 2008 21:03:05 GMT"
}
] | 2008-03-07T00:00:00 | [
[
"Popovych",
"Roman O.",
""
],
[
"Kunzinger",
"Michael",
""
],
[
"Ivanova",
"Nataliya M.",
""
]
] |
0706.0444 | Yuzhong Zhang Dr. | Y. Z. Zhang and Masatoshi Imada | Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field
Theory | 5 pages, 4 figures | Phys. Rev. B 76, 045108 (2007) | 10.1103/PhysRevB.76.045108 | null | cond-mat.str-el | null | We study metal-insulator transitions between Mott insulators and metals. The
transition mechanism completely different from the original dynamical mean
field theory (DMFT) emerges from a cluster extension of it. A consistent
picture suggests that the quasiparticle weight $Z$ remains nonzero through
metals and suddenly jumps to zero at the transition, while the gap opens
continuously in the insulators. This is in contrast with the original DMFT,
where $Z$ continuously vanishes but the gap opens discontinuously. The present
results arising from electron differentiation in momentum space agree with
recent puzzling bulk-sensitive experiments on CaVO$_3$ and SrVO$_3$.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:31:03 GMT"
}
] | 2007-07-18T00:00:00 | [
[
"Zhang",
"Y. Z.",
""
],
[
"Imada",
"Masatoshi",
""
]
] |
0706.0445 | Burhan Bakar | Burhan Bakar and Ugur Tirnakli | Damage spreading in 2-dimensional isotropic and anisotropic Bak-Sneppen
models | revised version, 9 pages, 5 eps figures, use of svjour.sty | Eur. Phys. J. B 62, 95 (2008) | 10.1140/epjb/e2008-00124-y | null | cond-mat.stat-mech | null | We implement the damage spreading technique on 2-dimensional isotropic and
anisotropic Bak-Sneppen models. Our extensive numerical simulations show that
there exists a power-law sensitivity to the initial conditions at the
statistically stationary state (self-organized critical state). Corresponding
growth exponent $\alpha$ for the Hamming distance and the dynamical exponent
$z$ are calculated. These values allow us to observe a clear data collapse of
the finite size scaling for both versions of the Bak-Sneppen model. Moreover,
it is shown that the growth exponent of the distance in the isotropic and
anisotropic Bak-Sneppen models is strongly affected by the choice of the
transient time.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:33:57 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 14:46:22 GMT"
}
] | 2008-03-29T00:00:00 | [
[
"Bakar",
"Burhan",
""
],
[
"Tirnakli",
"Ugur",
""
]
] |
0706.0446 | Leon Aldrovandi | L. G. Aldrovandi | Strings in Yang-Mills-Higgs theory coupled to gravity | 20 pages, no figure, modified version with new title, abstract and an
additional section completing the study of effective theories. Physical
Review D in press | Phys.Rev.D76:085015,2007 | 10.1103/PhysRevD.76.085015 | null | hep-th | null | Non-Abelian strings for an Einstein-Yang-Mills-Higgs theory are explicitly
constructed. We consider N_f Higgs fields in the fundamental representation of
the U(1)xSU(N_c) gauge group in order to have a color-flavor SU(N_c) group
remaining unbroken. Choosing a suitable ansatz for the metric, Bogomol'nyi-like
first order equations are found and rotationally symmetric solutions are
proposed. In the N_f = N_c case, solutions are local strings and are shown to
be truly non-Abelian by parameterizing them in terms of orientational
collective coordinates. When N_f > N_c, the solutions correspond to semilocal
strings which, beside the orientational degrees of freedom, acquire additional
collective coordinates parameterizing their transverse size. The low-energy
effective theories for the correspondent moduli are found, showing that all
zero modes are normalizable in presence of gravity, even in the semilocal case.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:01:14 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 17:25:54 GMT"
}
] | 2010-05-27T00:00:00 | [
[
"Aldrovandi",
"L. G.",
""
]
] |
0706.0447 | Francois Rodier | Fran\c{c}ois Rodier (IML), Eric F\'erard (GAATI) | Non lin\'earit\'e des fonctions bool\'eennes donn\'ees par des traces de
polyn\^omes de degr\'e binaire 3 | null | null | null | null | math.NT cs.CR cs.DM math.AG | null | Nous \'etudions la non lin\'earit\'e des fonctions d\'efinies sur F_{2^m}
o\`u $m$ est un entier impair, associ\'ees aux polyn\^omes de degr\'e 7 ou \`a
des polyn\^omes plus g\'en\'eraux.
-----
We study the nonlinearity of the functions defined on F_{2^m} where $m$ is an
odd integer, associated to the polynomials of degree 7 or more general
polynomials.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:37:29 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Rodier",
"François",
"",
"IML"
],
[
"Férard",
"Eric",
"",
"GAATI"
]
] |
0706.0448 | Tanusree Pal | Tanusree Pal, Punita Batra | Representations of Graded Multi-Loop Lie Algebras | Contents Changed | null | null | null | math.RT math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let g_A (respectively, g_A(\mu)) be the graded multi-loop Lie algebra
(respectively graded twisted multi-loop Lie algebra)" associated with the
simple finite dimensional Lie algebra g over the complex field C. In this
paper, we prove that irreducible integrable g_A(\mu)-modules with finite
dimensional weight spaces are either highest weight modules or their duals and
classify the isomorphism classes of irreducible integrable g_A-modules and
g_A(\mu)-modules with finite dimensional weight spaces.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:02:46 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 18:06:13 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Sep 2008 07:21:33 GMT"
}
] | 2008-09-09T00:00:00 | [
[
"Pal",
"Tanusree",
""
],
[
"Batra",
"Punita",
""
]
] |
0706.0449 | Fidel Schaposnik | L. Cieri and F.A. Schaposnik | The dyon charge in noncommutative gauge theories | 17 pages | Res.Lett.Phys.2008:890916,2008 | 10.1155/2008/890916 | null | hep-th | null | We present an explicit classical dyon solution for the noncommutative version
of the Yang-Mills-Higgs model (in the Prasad-Sommerfield limit) with a tehta
term. We show that the relation between classical electric and magnetic charges
also holds in noncommutative space. Extending the Noether approach to the case
of a noncommutative gauge theory, we analyze the effect of CP violation at the
quantum level, induced both by the theta term and by noncommutativity and we
prove that the Witten effect formula for the dyon charge remains the same as in
ordinary space.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:52:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Cieri",
"L.",
""
],
[
"Schaposnik",
"F. A.",
""
]
] |
0706.0450 | Sayak Mukherjee | Sayak Mukherjee, H.K. Janssen, and B. Schmittmann | Universal properties of population dynamics with fluctuating resources | 4 Pages | null | 10.1016/j.physa.2007.04.071 | null | cond-mat.stat-mech | null | Starting from the well-known field theory for directed percolation, we
describe an evolving population, near extinction, in an environment with its
own nontrivial spatio-temporal dynamics. Here, we consider the special case
where the environment follows a simple relaxational (Model A) dynamics. Two new
operators emerge, with upper critical dimension of four, which couple the two
theories in a nontrivial way. While the Wilson-Fisher fixed point remains
completely unaffected, a mismatch of time scales destabilizes the usual DP
fixed point, suggesting a crossover to a first order transition from the active
(surviving) to the inactive (extinct) state.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:05:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mukherjee",
"Sayak",
""
],
[
"Janssen",
"H. K.",
""
],
[
"Schmittmann",
"B.",
""
]
] |
0706.0451 | Amir H. Abbassi | Amir H. Abbassi and Amir M. Abbassi | Density-metric unimodular gravity:vacuum spherical symmetry | 15 pages,no,figures,typos corrected,new section added,published
version | Class.Quant.Grav.25:175018,2008 | 10.1088/0264-9381/25/17/175018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze an alternative theory of gravity characterized by metrics that are
tensor density of rank(0,2)and weight-1/2.The metric compatibility condition is
supposed to hold. The simplest expression for the action of gravitational field
is used.Taking the metric and trace of connections as dynamical variables,the
field equations in the absence of matter and other kinds of sources are
derived.The solutions of these equations are obtained for the case of vacuum
static spherical symmetric spacetime.The null geodesics and advance of
perihelion of ellipes are discussed.We confirm a subclass of solutions is
regular for r>0 and there is no event horizon while it is singular at r=0.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:14:21 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Jan 2008 07:11:25 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Aug 2008 05:28:54 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Abbassi",
"Amir H.",
""
],
[
"Abbassi",
"Amir M.",
""
]
] |
0706.0452 | Peter Dunsby | S. Carloni, A. Troisi and P. K. S. Dunsby | Some remarks on the dynamical systems approach to fourth order gravity | 19 pages, LaTeX | Gen.Rel.Grav.41:1757-1776,2009 | 10.1007/s10714-008-0747-9 | null | gr-qc astro-ph hep-th | null | Building on earlier work, we discuss a general framework for exploring the
cosmological dynamics of Higher Order Theories of Gravity. We show that once
the theory of gravity has been specified, the cosmological equations can be
written as a first-order autonomous system and we give several examples which
illustrate the utility of our method. We also discuss a number of results which
have appeared recently in the literature.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:06:54 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 21:31:14 GMT"
}
] | 2009-08-05T00:00:00 | [
[
"Carloni",
"S.",
""
],
[
"Troisi",
"A.",
""
],
[
"Dunsby",
"P. K. S.",
""
]
] |
0706.0453 | Marc Kesseb\"ohmer | Marc Kesseb\"ohmer, Bernd O. Stratmann | Fractal analysis for sets of non-differentiability of Minkowski's
question mark function | 22 pages, 2 figures | Journal of Number Theory 128 (2008), 2663-2686 | 10.1016/j.jnt.2007.12.010 | null | math.DS math.NT | null | In this paper we study various fractal geometric aspects of the Minkowski
question mark function $Q.$ We show that the unit interval can be written as
the union of the three sets $\Lambda_{0}:=\{x:Q'(x)=0\}$,
$\Lambda_{\infty}:=\{x:Q'(x)=\infty\}$, and $\Lambda_{\sim}:=\{x:Q'(x)$ does
not exist and $Q'(x)\not=\infty\}.$ The main result is that the Hausdorff
dimensions of these sets are related in the following way.
$\dim_{H}(\nu_{F})<\dim_{H}(\Lambda_{\sim})= \dim_{H} (\Lambda_{\infty}) =
\dim_{H} (\mathcal{L}(h_{\mathrm{top}}))<\dim_{H}(\Lambda_{0})=1.$
Here, $\mathcal{L}(h_{\mathrm{top}})$ refers to the level set of the
Stern-Brocot multifractal decomposition at the topological entropy
$h_{\mathrm{top}}=\log2$ of the Farey map $F,$ and $\dim_{H}(\nu_{F})$
denotes the Hausdorff dimension of the measure of maximal entropy of the
dynamical system associated with $F.$ The proofs rely partially on the
multifractal formalism for Stern-Brocot intervals and give non-trivial
applications of this formalism.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:37:08 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Jun 2007 13:50:10 GMT"
}
] | 2008-10-06T00:00:00 | [
[
"Kesseböhmer",
"Marc",
""
],
[
"Stratmann",
"Bernd O.",
""
]
] |
0706.0454 | Alexei Smirnov Yu | S. P. Mikheev and A. Yu. Smirnov | Neutrino oscillations in a variable-density medium and $\nu-$ bursts due
to the gravitational collapse of stars | latex, 5 pages, 2 figures, comments (June 2007) added | Sov.Phys.JETP64:4-7,1986; Zh.Eksp.Teor.Fiz.91:7-13,1986 | null | null | hep-ph | null | Under certain conditions, the propagation of a beam of oscillating neutrinos
in a variable-density medium takes the form of an almost complete
transformation of the initial type of neutrino into another type. The depth of
oscillations is then negligible. The transformation can occur in the cores and
envelopes of collapsing stars.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:32:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mikheev",
"S. P.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] |
0706.0455 | Jan Grabowski | Jan E. Grabowski | Braided enveloping algebras associated to quantum parabolic subalgebras | 21 pages. Corrected statement and proof of Proposition 3.3 with
subsequent minor changes to the remainder section 3. Revised presentation in
introduction and added concluding remarks | Communications in Algebra, 39 (2011), no. 10, 3491-3514 | 10.1080/00927872.2010.498394 | null | math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Associated to each subset $J$ of the nodes $I$ of a Dynkin diagram is a
triangular decomposition of the corresponding Lie algebra $\mathfrak{g}$ into
three subalgebras $\widetilde{\mathfrak{g}_{J}}$ (generated by $e_{j}$, $f_{j}$
for $j\in J$ and $h_{i}$ for $i\in I$), $\mathfrak{n}^{-}_{D}$ (generated by
$f_{d}$, $d\in D=I\setminus J$) and its dual $\mathfrak{n}_{D}^{+}$.
We demonstrate a quantum counterpart, generalising work of Majid and Rosso,
by exhibiting analogous triangular decompositions of $U_{q}(\mathfrak{g})$ and
identifying a graded braided Hopf algebra that quantizes
$\mathfrak{n}_{D}^{-}$. This algebra has many similar properties to
$U_{q}^{-}(\mathfrak{g})$, in many cases being a Nichols algebra and therefore
completely determined by its associated braiding.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:20:54 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Dec 2008 17:17:54 GMT"
},
{
"version": "v3",
"created": "Tue, 27 Jul 2010 14:52:28 GMT"
}
] | 2011-11-14T00:00:00 | [
[
"Grabowski",
"Jan E.",
""
]
] |
0706.0456 | Robert Thorne S | R.S. Thorne, A.D. Martin, W.J. Stirling and G. Watt | Parton Distributions for the LHC | 4 pages, 5 figures, Presented at 15th International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2007), Munich, Germany,
16-20 Apr 2007 | null | null | null | hep-ph | null | We present a preliminary set of updated NLO parton distributions. For the
first time we have a quantitative extraction of the strange quark and antiquark
distributions and their uncertainties determined from CCFR and NuTeV dimuon
cross sections. Additional jet data from HERA and the Tevatron improve our
gluon extraction. Lepton asymmetry data and neutrino structure functions
improve the flavour separation, particularly constraining the down quark
valence distribution.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:38:10 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Thorne",
"R. S.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Watt",
"G.",
""
]
] |
0706.0457 | Donald Sofge | D. A. Sofge, M. A. Potter, M. D. Bugajska, A. C. Schultz | Challenges and Opportunities of Evolutionary Robotics | 6 pages | D.A. Sofge, M.A. Potter, M.D. Bugajska, and A.C. Schultz,
"Challenges and Opportunities of Evolutionary Robotics." In Proc. 2nd Int'l
Conf. on Computational Intelligence, Robotics, and Autonomous Systems, 2003 | null | null | cs.NE cs.RO | null | Robotic hardware designs are becoming more complex as the variety and number
of on-board sensors increase and as greater computational power is provided in
ever-smaller packages on-board robots. These advances in hardware, however, do
not automatically translate into better software for controlling complex
robots. Evolutionary techniques hold the potential to solve many difficult
problems in robotics which defy simple conventional approaches, but present
many challenges as well. Numerous disciplines including artificial life,
cognitive science and neural networks, rule-based systems, behavior-based
control, genetic algorithms and other forms of evolutionary computation have
contributed to shaping the current state of evolutionary robotics. This paper
provides an overview of developments in the emerging field of evolutionary
robotics, and discusses some of the opportunities and challenges which
currently face practitioners in the field.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:08:22 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Sofge",
"D. A.",
""
],
[
"Potter",
"M. A.",
""
],
[
"Bugajska",
"M. D.",
""
],
[
"Schultz",
"A. C.",
""
]
] |
0706.0458 | Ashish Kumar | D0 Collaboration: V. Abazov, et al | Measurement of the ttbar production cross section in ppbar collisions
using dilepton events | 26 pages, 9 figures, submitted to Phys. Rev. D | Phys.Rev.D76:052006,2007 | 10.1103/PhysRevD.76.052006 | FERMILAB-PUB-07/143-E | hep-ex | null | We present a measurement of the ttbar pair production cross section in ppbar
collisions at sqrt(s) = 1.96 TeV utilizing approximately 425 pb-1 of data
collected with the D0 detector. We consider decay channels containing two high
pT charged leptons (either e or \mu) from leptonic decays of both top-daughter
W bosons. These were gathered using four sets of selection criteria, three of
which required that a pair of fully identified leptons (i.e., e\mu, ee, or
\mu\mu) be found. The fourth approach imposed less restrictive criteria on one
of the lepton candidates and required that at least one hadronic jet in each
event be tagged as containing a b quark. For a top quark mass of 175 GeV, the
measured cross section is 7.4 +/-1.4(stat} +/- 1.0(syst) pb.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:28:40 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 16:57:46 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"D0 Collaboration",
"",
""
],
[
"Abazov",
"V.",
""
]
] |
0706.0459 | Robert Thorne S | A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt | Update of Parton Distributions at NNLO | 13 pages, 11 figures. Version published. Slight extension and some
modification of references | Phys.Lett.B652:292-299,2007 | 10.1016/j.physletb.2007.07.040 | IPPP/07/23, DCPT/07/46 | hep-ph | null | We present a new set of parton distributions obtained at NNLO. These differ
from the previous sets available at NNLO due to improvements in the theoretical
treatment. In particular we include a full treatment of heavy flavours in the
region near the quark mass. In this way, an essentially complete set of NNLO
partons is presented for the first time. The improved treatment leads to a
significant change in the gluon and heavy quark distributions, and a larger
value of the QCD coupling at NNLO, alpha_S(M_Z^2) = 0.1191 +/- 0.002(expt.) +/-
0.003(theory). Indirectly this also leads to a change in the light partons at
small x and modifications of our predictions for W and Z production at the LHC.
As well as the best-fit set of partons, we also provide 30 additional sets
representing the uncertainties of the partons obtained using the Hessian
approach.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:50:40 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 10:30:09 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 16:17:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Martin",
"A. D.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Thorne",
"R. S.",
""
],
[
"Watt",
"G.",
""
]
] |
0706.0460 | Julianna S. Tymoczko | Julianna S. Tymoczko | Permutation actions on equivariant cohomology | 24 pages | null | null | null | math.AT math.CO | null | This survey paper describes two geometric representations of the permutation
group using the tools of toric topology. These actions are extremely useful for
computational problems in Schubert calculus. The (torus) equivariant cohomology
of the flag variety is constructed using the combinatorial description of
Goresky-Kottwitz-MacPherson, discussed in detail. Two permutation
representations on equivariant and ordinary cohomology are identified in terms
of irreducible representations of the permutation group. We show how to use the
permutation actions to construct divided difference operators and to give
formulas for some localizations of certain equivariant classes.
This paper includes several new results, in particular a new proof of the
Chevalley-Monk formula and a proof that one of the natural permutation
representations on the equivariant cohomology of the flag variety is the
regular representation. Many examples, exercises, and open questions are
provided.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:42:37 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Tymoczko",
"Julianna S.",
""
]
] |
0706.0461 | Roger A. Chevalier | Roger A. Chevalier | What Gamma-Ray Bursts Explode Into | 15 pages, for "070228: The Next Decade of Gamma-Ray Burst Afterglows"
eds. Wijers, R.A.M.J., Kaper, L, and van Eerten, H.J. (Elsevier: Amsterdam) | null | null | null | astro-ph | null | The association of long gamma-ray bursts (GRBs) with Type Ib/c supernovae
implies that they explode into the winds of their Wolf-Rayet progenitor stars.
Although the evolution of some GRB afterglows is consistent with expansion into
a free wind, there is also good evidence for expansion into a constant density
medium. The evidence includes the evolution of X-ray afterglows (when X-rays
are below the cooling frequency), the evolution of the pre-jet break optical
and X-ray afterglow, and the sharp turn-on observed for some afterglows. Recent
observations of short bursts, which are expected to be interacting with a
constant density medium, provide a check on the standard afterglow model.
Although radio observations do not support the constant density model for long
bursts in some cases, the evidence for constant density interaction is strong.
The most plausible way to produce such a medium around a massive star is to
shock the progenitor wind. This requires a smaller termination shock than would
be expected, possibly due to a high pressure surroundings, a high progenitor
velocity, or the particular evolution leading to a GRB. However, the need for
the termination shock near the deceleration radius cannot be plausibly
accomodated and may indicate that some long bursts have compact binary
progenitors and explode directly into the interstellar medium.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:41:56 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Chevalier",
"Roger A.",
""
]
] |
0706.0462 | Gordan Zitkovic | Gordan Zitkovic | Financial equilibria in the semimartingale setting: complete markets and
markets with withdrawal constraints | null | Gordan Zitkovic, "Financial equilibria in the semimartingale
setting: complete markets and markets with withdrawal constraints" (2006)
Finance and Stochastics vol.10 pp. 99-119 | null | null | q-fin.PR math.OC math.PR | null | Existence of stochastic financial equilibria giving rise to semimartingale
asset prices is established under a general class of assumptions. These
equilibria are expressed in real terms and span complete markets or markets
with withdrawal constraints.We deal with random endowment density streams which
admit jumps and general time-dependent utility functions on which only
regularity conditions are imposed. As an integral part of the proof of the main
result, we establish a novel characterization of semimartingale functions.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:42:04 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0463 | Claes Uggla | Claes Uggla | The Nature of Generic Cosmological Singularities | 14 pages, six figures; invited talk at the 11th Marcel Grossmann
Meeting on Recent Developments in General Relativity, Berlin, Germany, 23-29
July 2006 | null | 10.1142/9789812834300_0005 | null | gr-qc | null | The existence of a singularity by definition implies a preferred scale--the
affine parameter distance from/to the singularity of a causal geodesic that is
used to define it. However, this variable scale is also captured by the
expansion along the geodesic, and this can be used to obtain a regularized
state space picture by means of a conformal transformation that factors out the
expansion. This leads to the conformal `Hubble-normalized' orthonormal frame
approach which allows one to translate methods and results concerning spatially
homogeneous models into the generic inhomogeneous context, which in turn
enables one to derive the dynamical nature of generic cosmological
singularities. Here we describe this approach and outline the derivation of the
`cosmological billiard attractor,' which describes the generic dynamical
asymptotic behavior towards a generic spacelike singularity. We also compare
the `dynamical systems picture' resulting from this approach with other work on
generic spacelike singularities: the metric approach of Belinskii, Lifschitz,
and Khalatnikov, and the recent Iwasawa based Hamiltonian method used by
Damour, Henneaux, and Nicolai; in particular we show that the cosmological
billiards obtained by the latter and the cosmological billiard attractor form
complementary `dual' descriptions of the generic asymptotic dynamics of generic
spacelike singularities.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:51:30 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Uggla",
"Claes",
""
]
] |
0706.0464 | Wu Jing | Wu Jing | Jordan Triple Elementary Maps on Rings | 12 pages | null | null | null | math.RA math.OA | null | We prove that Jordan triple elementary surjective maps on unital rings
containing a nontrivial idempotent are automatically additive.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:52:00 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 14:55:19 GMT"
},
{
"version": "v3",
"created": "Thu, 7 Jun 2007 14:41:19 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"Jing",
"Wu",
""
]
] |
0706.0465 | Donald Sofge | D. A. Sofge | Virtual Sensor Based Fault Detection and Classification on a Plasma Etch
Reactor | 7 pages | D. Sofge, "Virtual Sensor Based Fault Detection and Classification
on a Plasma Etch Reactor," The 2nd Joint Mexico-US Int'l. Workshop on Neural
Networks and Neurocontrol (poster), 1997 | null | null | cs.AI cs.CV | null | The SEMATECH sponsored J-88-E project teaming Texas Instruments with
NeuroDyne (et al.) focused on Fault Detection and Classification (FDC) on a Lam
9600 aluminum plasma etch reactor, used in the process of semiconductor
fabrication. Fault classification was accomplished by implementing a series of
virtual sensor models which used data from real sensors (Lam Station sensors,
Optical Emission Spectroscopy, and RF Monitoring) to predict recipe setpoints
and wafer state characteristics. Fault detection and classification were
performed by comparing predicted recipe and wafer state values with expected
values. Models utilized include linear PLS, Polynomial PLS, and Neural Network
PLS. Prediction of recipe setpoints based upon sensor data provides a
capability for cross-checking that the machine is maintaining the desired
setpoints. Wafer state characteristics such as Line Width Reduction and
Remaining Oxide were estimated on-line using these same process sensors (Lam,
OES, RFM). Wafer-to-wafer measurement of these characteristics in a production
setting (where typically this information may be only sparsely available, if at
all, after batch processing runs with numerous wafers have been completed)
would provide important information to the operator that the process is or is
not producing wafers within acceptable bounds of product quality. Production
yield is increased, and correspondingly per unit cost is reduced, by providing
the operator with the opportunity to adjust the process or machine before
etching more wafers.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 15:55:27 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Sofge",
"D. A.",
""
]
] |
0706.0466 | Aleksandar Mikovic | A. Mikovic | Spin Network Wavefunction and the Graviton Propagator | 8 pages | null | 10.1002/prop.200710522 | null | gr-qc | null | We show that if the flat-spacetime wavefunction in the spin network basis of
Loop Quantum Gravity has a large-spin asymptotics given by Rovelli's ansatz
then the corresponding graviton propagator has the correct large-distance
asymptotics nonperturbatively and independently of the spin foam model used to
describe the evolution operator. We also argue that even in the Rovelli
approach the wavefunction should satisfy the Hamiltonian constraint and we give
an explanation for the spin parameter appearing in Rovelli's ansatz.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:05:06 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Mikovic",
"A.",
""
]
] |
0706.0467 | Sergio Souza | S.R. Souza, R. Donangelo, W.G. Lynch, and M.B. Tsang | Effects of geometric constraints on the nuclear multifragmentation
process | 16 pages, 5 figures | Phys.Rev.C76:024614,2007 | 10.1103/PhysRevC.76.024614 | null | nucl-th | null | We include in statistical model calculations the facts that in the nuclear
multifragmentation process the fragments are produced within a given volume and
have a finite size. The corrections associated with these constraints affect
the partition modes and, as a consequence, other observables in the process. In
particular, we find that the favored fragmenting modes strongly suppress the
collective flow energy, leading to much lower values compared to what is
obtained from unconstrained calculations. This leads, for a given total
excitation energy, to a nontrivial correlation between the breakup temperature
and the collective expansion velocity. In particular we find that, under some
conditions, the temperature of the fragmenting system may increase as a
function of this expansion velocity, contrary to what it might be expected.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:07:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Souza",
"S. R.",
""
],
[
"Donangelo",
"R.",
""
],
[
"Lynch",
"W. G.",
""
],
[
"Tsang",
"M. B.",
""
]
] |
0706.0468 | Gordan Zitkovic | Kasper Larsen, Gordan Zitkovic | On the semimartingale property via bounded logarithmic utility | K. Larsen, G. Zitkovic, "On the semimartingale property via bounded
logarithmic utility" (2006) to appear in Annals of Finance | null | null | null | q-fin.PM math.PR q-fin.PR | null | This paper provides a new version of the condition of Di Nunno et al. (2003),
Ankirchner and Imkeller (2005) and Biagini and \{O}ksendal (2005) ensuring the
semimartingale property for a large class of continuous stochastic processes.
Unlike our predecessors, we base our modeling framework on the concept of
portfolio proportions which yields a short self-contained proof of the main
theorem, as well as a counterexample, showing that analogues of our results do
not hold in the discontinuous setting.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:16:02 GMT"
}
] | 2008-12-10T00:00:00 | [
[
"Larsen",
"Kasper",
""
],
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0469 | David P. Rideout | Johannes Brunnemann and David Rideout | Properties of the Volume Operator in Loop Quantum Gravity I: Results | 36 pages, 7 figures, LaTeX. See also companion paper
arXiv:0706.0382v1. Version as published in CQG in 2008. See arXiv:1003.2348
for important remarks regarding the sigma configurations. Subsequent
computations have revealed some minor errors, which do not change the
qualitative results but modify some of the numbers presented here | Class.Quant.Grav.25:065001,2008 | 10.1088/0264-9381/25/6/065001 | Imperial/TP/2007/DR/01 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the spectral properties of the volume operator of Ashtekar and
Lewandowski in Loop Quantum Gravity, which is the quantum analogue of the
classical volume expression for regions in three dimensional Riemannian space.
Our analysis considers for the first time generic graph vertices of valence
greater than four. Here we find that the geometry of the underlying vertex
characterizes the spectral properties of the volume operator, in particular the
presence of a `volume gap' (a smallest non-zero eigenvalue in the spectrum) is
found to depend on the vertex embedding. We compute the set of all
non-spatially diffeomorphic non-coplanar vertex embeddings for vertices of
valence 5--7, and argue that these sets can be used to label spatial
diffeomorphism invariant states. We observe how gauge invariance connects
vertex geometry and representation properties of the underlying gauge group in
a natural way. Analytical results on the spectrum on 4-valent vertices are
included, for which the presence of a volume gap is proved. This paper presents
our main results; details are provided by a companion paper arXiv:0706.0382v1.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:32:12 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Nov 2010 16:56:05 GMT"
}
] | 2010-11-22T00:00:00 | [
[
"Brunnemann",
"Johannes",
""
],
[
"Rideout",
"David",
""
]
] |
0706.0470 | Adrian Diaconu | Adrian Diaconu and Ye Tian | Twisted Fermat curves over totally real fields | 24 pages, published | Ann. of Math. (2) 162 (2005), no. 3, 1353--1376 | null | null | math.NT | null | Let p be a prime number, F a totally real field such that [F(mu_p): F]=2 and
[F:Q] is odd. For delta \in F^times, let [delta] denote its class in
F^times/F^{times p}. In this paper, we show
Main Theorem. There are infinitely many classes [delta]\in F^times/F^{times
p} such that the twisted affine Fermat curves W_delta: X^p+Y^p=delta have no
F-rational points.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:19:33 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Diaconu",
"Adrian",
""
],
[
"Tian",
"Ye",
""
]
] |
0706.0471 | Franz Hinterleitner | F. Hinterleitner | Remarks on DSR and Gravity | 13 pages, 1 figure | Class.Quant.Grav.25:075018,2008 | 10.1088/0264-9381/25/7/075018 | null | gr-qc | null | Modifications of Special Relativity by the introduction of an invariant
energy and/or momentum level (so-called Doubly Special Relativity theories,
DSR) or by an energy-momentum dependence of the Planck constant (Generalized
Uncertainty Principle, GUP) are compared with classical gravitational effects
in an interaction processes. For the low energy limit of the usual formulations
of DSR to be equivalent with Newtonian gravity, a restrictive condition is
found. GUP yields an effective repulsion, in analogy to the gravitational
repulsion in loop quantum cosmology.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:27:24 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Jan 2008 14:39:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hinterleitner",
"F.",
""
]
] |
0706.0472 | Frank Simon | STAR Collaboration, B.I. Abelev, et al | Forward Lambda Production and Nuclear Stopping Power in d + Au
Collisions at sqrt(s_NN) = 200 GeV | 11 pages, 7 figures, 3 tables, published in Physical Review C, v2:
updated text and figures | Phys.Rev.C76:064904,2007 | 10.1103/PhysRevC.76.064904 | null | nucl-ex | null | We report the measurement of Lamda and Anti-Lamda yields and inverse slope
parameters in d + Au collisions at sqrt(s_NN) = 200 GeV at forward and backward
rapidities (y = +- 2.75), using data from the STAR forward time projection
chambers. The contributions of different processes to baryon transport and
particle production are probed exploiting the inherent asymmetry of the d + Au
system. Comparisons to model calculations show that the baryon transport on the
deuteron side is consistent with multiple collisions of the deuteron nucleons
with gold participants. On the gold side HIJING based models do not describe
the measured particle yields while models with initial state nuclear effects
and/or hadronic rescattering do. The multichain model can provide a good
description of the net baryon density in d + Au collisions at energies
available at the BNL Relativistic Heavy Ion Collider, and the derived
parameters of the model agree with those from nuclear collisions at lower
energies.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:28:32 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 16:25:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"STAR Collaboration",
"",
""
],
[
"Abelev",
"B. I.",
""
]
] |
0706.0473 | Vicente Pleitez | J. C. Montero and V. Pleitez | Gauging U(1) symmetries and the number of right-handed neutrinos | Published version in PLB format | Phys.Lett.B675:64-68,2009 | 10.1016/j.physletb.2009.03.065 | IFT-P.09/2007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we consider that assuming: a) that the only left-handed
neutral fermions are the active neutrinos, b) that $B-L$ is a gauge symmetry,
and c) that the $L$ assignment is restricted to the integer numbers, the
anomaly cancellation imply that at least three right-handed neutrinos must be
added to the minimal representation content of the electroweak standard model.
However, two types of models arise: i) the usual one where each of the three
identical right-handed neutrinos has total lepton number L=1; ii) and the other
one in which two of them carry L=4 while the third one carries $L=-5$.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:29:11 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jul 2007 19:26:51 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Dec 2008 19:01:51 GMT"
},
{
"version": "v4",
"created": "Thu, 7 May 2009 17:51:37 GMT"
}
] | 2009-05-29T00:00:00 | [
[
"Montero",
"J. C.",
""
],
[
"Pleitez",
"V.",
""
]
] |
0706.0474 | Gordan Zitkovic | Kasper Larsen, Gordan Zitkovic | Stability of utility-maximization in incomplete markets | to appear in Stochastic Processes and Applications | null | null | null | q-fin.PM math.OC math.PR | null | The effectiveness of utility-maximization techniques for portfolio management
relies on our ability to estimate correctly the parameters of the dynamics of
the underlying financial assets. In the setting of complete or incomplete
financial markets, we investigate whether small perturbations of the market
coefficient processes lead to small changes in the agent's optimal behavior
derived from the solution of the related utility-maximization problems.
Specifically, we identify the topologies on the parameter process space and the
solution space under which utility-maximization is a continuous operation, and
we provide a counterexample showing that our results are best possible, in a
certain sense. A novel result about the structure of the solution of the
utility-maximization problem where prices are modeled by continuous
semimartingales is established as an offshoot of the proof of our central
theorem.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:29:38 GMT"
}
] | 2008-12-10T00:00:00 | [
[
"Larsen",
"Kasper",
""
],
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0475 | Andres Santos | Andres Santos, Vicente Garzo | Simple shear flow in inelastic Maxwell models | 18 pages, 7 figures; v2: minor changes | J. Stat. Mech., P08021 (2007) | 10.1088/1742-5468/2007/08/P08021 | null | cond-mat.soft cond-mat.stat-mech | null | The Boltzmann equation for inelastic Maxwell models is considered to
determine the velocity moments through fourth degree in the simple shear flow
state. First, the rheological properties (which are related to the
second-degree velocity moments) are {\em exactly} evaluated in terms of the
coefficient of restitution $\alpha$ and the (reduced) shear rate $a^*$. For a
given value of $\alpha$, the above transport properties decrease with
increasing shear rate. Moreover, as expected, the third-degree and the
asymmetric fourth-degree moments vanish in the long time limit when they are
scaled with the thermal speed. On the other hand, as in the case of elastic
collisions, our results show that, for a given value of $\alpha$, the scaled
symmetric fourth-degree moments diverge in time for shear rates larger than a
certain critical value $a_c^*(\alpha)$ which decreases with increasing
dissipation. The explicit shear-rate dependence of the fourth-degree moments
below this critical value is also obtained.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:30:24 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 17:08:33 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Santos",
"Andres",
""
],
[
"Garzo",
"Vicente",
""
]
] |
0706.0476 | Roby Cherian | Roby Cherian, Priya Mahadevan and Clas Persson | Role of semi core levels in determining the band-gaps of semiconductors:
First-principles calculations with model Hamiltonians | 25 pages, 10 figures | null | null | null | cond-mat.mtrl-sci | null | First principle calculations based on LDA/GGA approximation for the exchange
functional underestimate the position of the semi core 3d levels in GaX (X = N,
P and As) semiconductors. A self-interaction correction scheme within the
LDA+U/GGA+U approximation is found to be sufficient to correct this
discrepancy. A consequence of thiscorrection is that the bandgap (E_g) of the
semiconductors also improves. The belief has been that the bandgap correction
comes from modified semi core-valence interaction. We examine this often used
approximation in great detail and find that although bandgap changes as large
as 0.63 eV for GaAs, 0.42 eV for GaP and 0.46 eV for GaN are obtained within
this approach for U= 20 eV on the Ga d states, only 0.1 eV, 0.1 eV and 0.15 eV
for GaAs, GaP and GaN arise from semi core-valence interaction. As U is
increased, the bandgap keeps improving. We trace this effect primarily to the
interaction of the Ga 4d states in the conduction band with the anion p states.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:31:11 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Cherian",
"Roby",
""
],
[
"Mahadevan",
"Priya",
""
],
[
"Persson",
"Clas",
""
]
] |
0706.0477 | Patrik \"Ohberg | J. Ruseckas, G. Juzeliunas, P. Ohberg and S.M. Barnett | Polarisation rotation of slow light with orbital angular momentum in
ultracold atomic gases | 5 pages, 1 figure | null | 10.1103/PhysRevA.76.053822 | null | cond-mat.other | null | We consider the propagation of slow light with an orbital angular momentum
(OAM) in a moving atomic medium. We have derived a general equation of motion
and applied it in analysing propagation of slow light with an OAM in a rotating
medium, such as a vortex lattice. We have shown that the OAM of slow light
manifests itself in a rotation of the polarisation plane of linearly polarised
light. To extract a pure rotational phase shift, we suggest to measure a
difference in the angle of the polarisation plane rotation by two consecutive
light beams with opposite OAM. The differential angle $\Delta\alpha_{\ell}$ is
proportional to the rotation frequency of the medium $\omega_{\mathrm{rot}}$
and the winding number $\ell$ of light, and is inversely proportional to the
group velocity of light. For slow light the angle $\Delta\alpha_{\ell}$ should
be large enough to be detectable. The effect can be used as a tool for
measuring the rotation frequency $\omega_{\mathrm{rot}}$ of the medium.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:35:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ruseckas",
"J.",
""
],
[
"Juzeliunas",
"G.",
""
],
[
"Ohberg",
"P.",
""
],
[
"Barnett",
"S. M.",
""
]
] |
0706.0478 | Gordan Zitkovic | Mark Owen, Gordan Zitkovic | Optimal Investment with an Unbounded Random Endowment and Utility-Based
Pricing | major revision (mostly, but not entirely, cosmetic) | null | null | null | q-fin.PM math.OC math.PR | null | This paper studies the problem of maximizing the expected utility of terminal
wealth for a financial agent with an unbounded random endowment, and with a
utility function which supports both positive and negative wealth. We prove the
existence of an optimal trading strategy within a class of permissible
strategies -- those strategies whose wealth process is a supermartingale under
all pricing measures with finite relative entropy. We give necessary and
sufficient conditions for the absence of utility-based arbitrage, and for the
existence of a solution to the primal problem.
We consider two utility-based methods which can be used to price contingent
claims. Firstly we investigate marginal utility-based price processes
(MUBPP's). We show that such processes can be characterized as local
martingales under the normalized optimal dual measure for the utility
maximizing investor. Finally, we present some new results on utility
indifference prices, including continuity properties and volume asymptotics for
the case of a general utility function, unbounded endowment and unbounded
contingent claims.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:39:11 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 15:07:30 GMT"
}
] | 2008-12-10T00:00:00 | [
[
"Owen",
"Mark",
""
],
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0479 | Robert R. Tucci | Robert R. Tucci | How to Compile Some NAND Formula Evaluators | Ver.1- 58 pages (files: 1 .tex, 2 .sty, 14 .eps); Ver.2- 64 pages
(files: 1 .tex, 2 .sty, 15 .eps, 2 .m, 1 .xxx) Corrected serious error that
arose from neglecting time-ordering of exponential. Tree graph compilation is
now claimed approximate rather than exact | null | null | null | quant-ph | null | We say a unitary operator acting on a set of qubits has been compiled if it
has been expressed as a SEO (sequence of elementary operations, like CNOTs and
single-qubit operations). SEO's are often represented as quantum circuits.
arXiv:quant-ph/0702144 by Farhi-Goldstone-Gutmann has inspired a recent flurry
of papers, that propose quantum algorithms for evaluating NAND formulas via
quantum walks over tree graphs. These algorithms use two types of unitary
evolution: oracle and non-oracle. Non-oracle evolutions are independent of the
NAND formula input, whereas oracle evolutions depend on this input. In this
paper we compile (i.e., give explicit SEOs and their associated quantum
circuits for) the oracle and non-oracle evolution operators used in some of
these NAND formula evaluators. We consider here only the case of balanced
binary NAND trees. Our compilation methods are based on the CSD (Cosine Sine
Decomposition), a matrix decomposition from Linear Algebra. The CS
decomposition has been used very successfully in the past to compile
unstructured unitary matrices exactly.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:46:56 GMT"
},
{
"version": "v2",
"created": "Sun, 23 Dec 2007 17:51:34 GMT"
}
] | 2007-12-23T00:00:00 | [
[
"Tucci",
"Robert R.",
""
]
] |
0706.0480 | Gordan Zitkovic | Traian A. Pirvu, Gordan Zitkovic | Maximizing the Growth Rate under Risk Constraints | null | null | null | null | q-fin.PM math.OC math.PR | null | We investigate the ergodic problem of growth-rate maximization under a class
of risk constraints in the context of incomplete, It\^{o}-process models of
financial markets with random ergodic coefficients. Including {\em
value-at-risk} (VaR), {\em tail-value-at-risk} (TVaR), and {\em limited
expected loss} (LEL), these constraints can be both wealth-dependent(relative)
and wealth-independent (absolute). The optimal policy is shown to exist in an
appropriate admissibility class, and can be obtained explicitly by uniform,
state-dependent scaling down of the unconstrained (Merton) optimal portfolio.
This implies that the risk-constrained wealth-growth optimizer locally behaves
like a CRRA-investor, with the relative risk-aversion coefficient depending on
the current values of the market coefficients.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:47:04 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Pirvu",
"Traian A.",
""
],
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0481 | Olaf Post | Pavel Exner and Olaf Post | Quantum networks modelled by graphs | 13 pages, 1 figure | null | 10.1063/1.2915634 | null | math-ph math.MP math.SP | null | Quantum networks are often modelled using Schroedinger operators on metric
graphs. To give meaning to such models one has to know how to interpret the
boundary conditions which match the wave functions at the graph vertices. In
this article we give a survey, technically not too heavy, of several recent
results which serve this purpose. Specifically, we consider approximations by
means of ``fat graphs'' -- in other words, suitable families of shrinking
manifolds -- and discuss convergence of the spectra and resonances in such a
setting.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:51:43 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Dec 2007 14:56:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Exner",
"Pavel",
""
],
[
"Post",
"Olaf",
""
]
] |
0706.0482 | Constantinos Kardaras | Constantinos Kardaras and Gordan Zitkovic | Stability of the utility maximization problem with random endowment in
incomplete markets | 21 pages, revised version. To appear in "Mathematical Finance". | null | null | null | q-fin.PM math.OC math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a stability analysis for the utility maximization problem in a
general semimartingale model where both liquid and illiquid assets (random
endowments) are present. Small misspecifications of preferences (as modeled via
expected utility), as well as views of the world or the market model (as
modeled via subjective probabilities) are considered. Simple sufficient
conditions are given for the problem to be well-posed, in the sense the optimal
wealth and the marginal utility-based prices are continuous functionals of
preferences and probabilistic views.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 16:54:26 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 16:42:38 GMT"
},
{
"version": "v3",
"created": "Tue, 16 Mar 2010 00:26:28 GMT"
}
] | 2010-03-17T00:00:00 | [
[
"Kardaras",
"Constantinos",
""
],
[
"Zitkovic",
"Gordan",
""
]
] |
0706.0483 | Paola Cappellaro | Paola Cappellaro, Chandrasekhar Ramanathan, David G. Cory | Dynamics and Control of a Quasi-1D Spin System | null | Phys. Rev. Lett. 99, 250506 (2007) | 10.1103/PhysRevA.76.032317 | null | quant-ph | null | We study experimentally a system comprised of linear chains of spin-1/2
nuclei that provides a test-bed for multi-body dynamics and quantum information
processing. This system is a paradigm for a new class of quantum information
devices that can perform particular tasks even without universal control of the
whole quantum system. We investigate the extent of control achievable on the
system with current experimental apparatus and methods to gain information on
the system state, when full tomography is not possible and in any case highly
inefficient.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:18:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cappellaro",
"Paola",
""
],
[
"Ramanathan",
"Chandrasekhar",
""
],
[
"Cory",
"David G.",
""
]
] |
0706.0484 | David Wright | David R. Wright | Motivation, Design, and Ubiquity: A Discussion of Research Ethics and
Computer Science | Written as central essay for the Computer Science module of the
LANGURE model curriculum in Research Ethics | null | null | null | cs.GL | null | Modern society is permeated with computers, and the software that controls
them can have latent, long-term, and immediate effects that reach far beyond
the actual users of these systems. This places researchers in Computer Science
and Software Engineering in a critical position of influence and
responsibility, more than any other field because computer systems are vital
research tools for other disciplines. This essay presents several key ethical
concerns and responsibilities relating to research in computing. The goal is to
promote awareness and discussion of ethical issues among computer science
researchers. A hypothetical case study is provided, along with questions for
reflection and discussion.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:17:44 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Wright",
"David R.",
""
]
] |
0706.0485 | Benjamin Shlaer | Adam R. Brown, Saswat Sarangi, Benjamin Shlaer, Amanda Weltman | A Wrinkle in Coleman - De Luccia | 4 pages, 2 figures, changes made to 'including gravity' section | Phys.Rev.Lett.99:161601,2007 | 10.1103/PhysRevLett.99.161601 | null | hep-th astro-ph gr-qc | null | Stringy effects on vacuum transitions are shown to include surprisingly large
decay rates through very high potential barriers. This simple, yet
counter-intuitive result will drastically modify the measure on the landscape
of string vacua.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:18:07 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Jun 2007 22:06:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brown",
"Adam R.",
""
],
[
"Sarangi",
"Saswat",
""
],
[
"Shlaer",
"Benjamin",
""
],
[
"Weltman",
"Amanda",
""
]
] |
0706.0486 | Anand Pillay | Clifton Ealy, Krzysztof Krupinski, Anand Pillay | Superrosy dependent groups having finitely satisfiable generics | null | null | null | null | math.LO math.GR | null | We study a model theoretic context (finite thorn rank, NIP, with finitely
satisfiable generics) which is a common generalization of groups of finite
Morley rank and definably compact groups in o-minimal structures. We show that
assuming thorn rank 1, the group is abelian-by-finite, and assuming thorn rank
2 the group is solvable by finite. Also a field is algebraically closed.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:29:14 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Ealy",
"Clifton",
""
],
[
"Krupinski",
"Krzysztof",
""
],
[
"Pillay",
"Anand",
""
]
] |
0706.0487 | Enrico Nardi | Enrico Nardi | Recent Issues in Leptogenesis | Talk given at the XLII Rencontres de Moriond, La Thuile, Aosta
Valley, Italy, March 10 - 17, 2007. One paragraph corrected, one reference
added. 8 pages, 2 figures | null | null | null | hep-ph | null | Baryogenesis via leptogenesis provides an appealing mechanism to explain the
observed baryon asymmetry of the Universe. Recent refinements in the
understanding of the dynamics of leptogenesis include detailed studies of the
effects of lepton flavors and of the role possibly played by the lepton
asymmetries generated in the decays of the heavier singlet neutrinos $N_{2,3}$.
A review of these recent developments in the theory of leptogenesis is
presented.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:39:30 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jun 2007 13:10:14 GMT"
}
] | 2007-06-11T00:00:00 | [
[
"Nardi",
"Enrico",
""
]
] |
0706.0488 | Wu Jing | Wu Jing | Additivity of Jordan Elementary Maps on Rings | 12 pages | null | null | null | math.RA math.OA | null | We prove that Jordan elementary surjective maps on rings are automatically
additive.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:43:42 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Jun 2007 14:39:54 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"Jing",
"Wu",
""
]
] |
0706.0489 | Markus Jalsenius | Markus Jalsenius | Sampling Colourings of the Triangular Lattice | 42 pages. Added appendix that describes implementation. Added
ancillary files | null | null | null | math-ph cs.DM cs.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Glauber dynamics on proper 9-colourings of the triangular
lattice is rapidly mixing, which allows for efficient sampling. Consequently,
there is a fully polynomial randomised approximation scheme (FPRAS) for
counting proper 9-colourings of the triangular lattice. Proper colourings
correspond to configurations in the zero-temperature anti-ferromagnetic Potts
model. We show that the spin system consisting of proper 9-colourings of the
triangular lattice has strong spatial mixing. This implies that there is a
unique infinite-volume Gibbs distribution, which is an important property
studied in statistical physics. Our results build on previous work by Goldberg,
Martin and Paterson, who showed similar results for 10 colours on the
triangular lattice. Their work was preceded by Salas and Sokal's 11-colour
result. Both proofs rely on computational assistance, and so does our 9-colour
proof. We have used a randomised heuristic to guide us towards rigourous
results.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 17:49:25 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Mar 2010 17:49:43 GMT"
},
{
"version": "v3",
"created": "Tue, 26 Oct 2010 02:09:02 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Jalsenius",
"Markus",
""
]
] |
0706.0490 | Peter Arnold | Peter Arnold and Guy D. Moore | Non-Abelian Plasma Instabilities for Extreme Anisotropy | 29 pages, 17 figures | Phys.Rev.D76:045009,2007 | 10.1103/PhysRevD.76.045009 | null | hep-ph nucl-th | null | Thermalization of quark-gluon plasmas in heavy-ion collisions is a difficult
theoretical problem. One theoretical goal has been to understand the physics of
thermalization in the relatively simplifying limit of arbitrarily high energy
collisions, where the running coupling alpha_s is weak. One of the current
roadblocks to achieving this goal is lack of knowledge about the behavior of
plasma instabilities when particle distributions are highly anisotropic. In
particular, it has not been known how the magnetic fields generated by plasma
instabilities scale with anisotropy. In this paper, we use numerical
simulations in a first attempt to determine this scaling.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:15:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arnold",
"Peter",
""
],
[
"Moore",
"Guy D.",
""
]
] |
0706.0491 | Lisheng Geng | L. S. Geng, J. Meng, and H. Toki | Reflection asymmetric relativistic mean field approach and its
application to the octupole deformed nucleus $^{226}$Ra | 4 pages, 2 figures, and 2 tables, to appear in Chinese Physics
Letters | Chin.Phys.Lett.24:1865-1868,2007 | 10.1088/0256-307X/24/7/021 | null | nucl-th | null | A Reflection ASymmetric Relativistic Mean Field (RAS-RMF) approach is
developed by expanding the equations of motion for both the nucleons and the
mesons on the eigenfunctions of the two-center harmonic-oscillator potential.
The efficiency and reliability of the RAS-RMF approach are demonstrated in its
application to the well-known octupole deformed nucleus $^{226}$Ra and the
available data, including the binding energy and the deformation parameters,
are well reproduced.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:17:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Geng",
"L. S.",
""
],
[
"Meng",
"J.",
""
],
[
"Toki",
"H.",
""
]
] |
0706.0492 | Mauro Paternostro | M. Paternostro, S. Bose, M. S. Kim | Interaction engineering for environmental probing | 4 pages, 4 figures, RevTeX4 | null | null | null | quant-ph cond-mat.other | null | We study the conditions for the probing of an environment affecting one party
of a bipartite system of interacting objects by measurements operated only on
the other element. We show that entanglement plays no crucial role in such an
environment-characterization. On the other hand, if an interaction is
established between the two parties, information can be reliably gathered. This
result holds for both discrete and continuous variables and helps in the
interpretation of recent experiments addressing the properties of mesoscopic
objects.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:27:29 GMT"
}
] | 2007-06-19T00:00:00 | [
[
"Paternostro",
"M.",
""
],
[
"Bose",
"S.",
""
],
[
"Kim",
"M. S.",
""
]
] |
0706.0493 | Leo Alonso | Leovigildo Alonso, Ana Jeremias, Marta Perez, Maria J. Vale | The derived category of quasi-coherent sheaves and axiomatic stable
homotopy | v2: 31 pages, some improvements in exposition; v3 updated
bibliography, to appear Adv. Math | Adv. Math. 218 (2008), no. 4, pp.1224-1252 | 10.1016/j.aim.2008.03.011 | null | math.AG math.AT | null | We prove in this paper that for a quasi-compact and semi-separated (non
necessarily noetherian) scheme X, the derived category of quasi-coherent
sheaves over X, D(A_qc(X)), is a stable homotopy category in the sense of
Hovey, Palmieri and Strickland, answering a question posed by Strickland.
Moreover we show that it is unital and algebraic. We also prove that for a
noetherian semi-separated formal scheme X, its derived category of sheaves of
modules with quasi-coherent torsion homologies D_qct(X) is a stable homotopy
category. It is algebraic but if the formal scheme is not a usual scheme, it is
not unital, therefore its abstract nature differs essentially from that of the
derived category of a usual scheme.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:32:28 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 12:11:58 GMT"
},
{
"version": "v3",
"created": "Tue, 22 Apr 2008 15:04:10 GMT"
}
] | 2017-04-27T00:00:00 | [
[
"Alonso",
"Leovigildo",
""
],
[
"Jeremias",
"Ana",
""
],
[
"Perez",
"Marta",
""
],
[
"Vale",
"Maria J.",
""
]
] |
0706.0494 | Paul Hacking | Alessio Corti, Paul Hacking, J\'anos Koll\'ar, Robert Lazarsfeld,
Mircea Musta\c{t}\u{a} | Lectures on flips and minimal models | 29 pages. Lecture notes from MSRI workshop | null | null | null | math.AG | null | This document contains notes from the lectures of Corti, Koll\'ar,
Lazarsfeld, and Musta\c{t}\u{a} at the workshop ``Minimal and canonical models
in algebraic geometry" at MSRI, Berkeley, April 2007. The lectures give an
overview of the recent advances on canonical and minimal models of algebraic
varieties obtained by Hacon--McKernan and Birkar--Cascini--Hacon--McKernan.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:33:57 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Corti",
"Alessio",
""
],
[
"Hacking",
"Paul",
""
],
[
"Kollár",
"János",
""
],
[
"Lazarsfeld",
"Robert",
""
],
[
"Mustaţă",
"Mircea",
""
]
] |
0706.0495 | Nate Bastian | N. Bastian (1), B. Ercolano (2), M. Gieles (3), E. Rosolowsky (2), R.
A. Scheepmaker (4), R. Gutermuth (2), Yu. Efremov (5) ((1) University College
London, (2) Harvard-Smithsonian CfA, (3) ESO-Santiago, (4) Utrecht
University, (5) Sternberg Astronomical Institute, Moscow) | Hierarchical Star-Formation in M33: Fundamental properties of the
star-forming regions | 12 pages, 16 figures, accepted MNRAS | Mon.Not.Roy.Astron.Soc.379:1302-1312,2007 | 10.1111/j.1365-2966.2007.12064.x | null | astro-ph | null | Star-formation within galaxies appears on multiple scales, from spiral
structure, to OB associations, to individual star clusters, and often
sub-structure within these clusters. This multitude of scales calls for
objective methods to find and classify star-forming regions, regardless of
spatial size. To this end, we present an analysis of star-forming groups in the
local group spiral galaxy M33, based on a new implementation of the Minimum
Spanning Tree (MST) method. Unlike previous studies which limited themselves to
a single spatial scale, we study star-forming structures from the effective
resolution limit (~20pc) to kpc scales. We find evidence for a continuum of
star-forming group sizes, from pc to kpc scales. We do not find a
characteristic scale for OB associations, unlike that found in previous
studies, and we suggest that the appearance of such a scale was caused by
spatial resolution and selection effects. The luminosity function of the groups
is found to be well represented by a power-law with an index, -2, similar to
that found for clusters and GMCs. Additionally, the groups follow a similar
mass-radius relation as GMCs. The size distribution of the groups is best
described by a log-normal distribution and we show that within a hierarchical
distribution, if a scale is selected to find structure, the resulting size
distribution will have a log-normal distribution. We find an abrupt drop of the
number of groups outside a galactic radius of ~4kpc, suggesting a change in the
structure of the star-forming ISM, possibly reflected in the lack of GMCs
beyond this radius. (abridged)
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:38:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bastian",
"N.",
""
],
[
"Ercolano",
"B.",
""
],
[
"Gieles",
"M.",
""
],
[
"Rosolowsky",
"E.",
""
],
[
"Scheepmaker",
"R. A.",
""
],
[
"Gutermuth",
"R.",
""
],
[
"Efremov",
"Yu.",
""
]
] |
0706.0496 | Mihyun Kang | Michael Behrisch, Amin Coja-Oghlan, Mihyun Kang | The Order of the Giant Component of Random Hypergraphs | 28 pages, 1 figure | Random Structures and algorithms 36 (2010) 149 - 184 | 10.1002/rsa.20282 | null | math.CO math.PR | null | We establish central and local limit theorems for the number of vertices in
the largest component of a random $d$-uniform hypergraph $\hnp$ with edge
probability $p=c/\binnd$, where $(d-1)^{-1}+\eps<c<\infty$. The proof relies on
a new, purely probabilistic approach, and is based on Stein's method as well as
exposing the edges of $H_d(n,p)$ in several rounds.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:40:46 GMT"
}
] | 2017-11-17T00:00:00 | [
[
"Behrisch",
"Michael",
""
],
[
"Coja-Oghlan",
"Amin",
""
],
[
"Kang",
"Mihyun",
""
]
] |
0706.0497 | Mihyun Kang | Michael Behrisch, Amin Coja-Oghlan, Mihyun Kang | Local Limit Theorems and Number of Connected Hypergraphs | 24 pages | Combinatorics, Probability and Computing 23 (2014), 331-366 and
367-385 | null | null | math.CO math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $H_d(n,p)$ signify a random $d$-uniform hypergraph with $n$ vertices in
which each of the ${n}\choose{d}$ possible edges is present with probability
$p=p(n)$ independently, and let $H_d(n,m)$ denote a uniformly distributed with
$n$ vertices and $m$ edges. We derive local limit theorems for the joint
distribution of the number of vertices and the number of edges in the largest
component of $H_d(n,p)$ and $H_d(n,m)$ for the regime ${{n-1}\choose{d-1}}
p,dm/n >(d-1)^{-1}+\epsilon$. As an application, we obtain an asymptotic
formula for the probability that $H_d(n,p)$ or $H_d(n,m)$ is connected. In
addition, we infer a local limit theorem for the conditional distribution of
the number of edges in $H_d(n,p)$ given connectivity. While most prior work on
this subject relies on techniques from enumerative combinatorics, we present a
new, purely probabilistic approach.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:49:03 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2014 09:26:09 GMT"
},
{
"version": "v3",
"created": "Thu, 26 Jun 2014 18:10:14 GMT"
}
] | 2014-06-27T00:00:00 | [
[
"Behrisch",
"Michael",
""
],
[
"Coja-Oghlan",
"Amin",
""
],
[
"Kang",
"Mihyun",
""
]
] |
0706.0498 | Zhiyi Chi | Zhiyi Chi | False discovery rate control with multivariate $p$-values | Published in at http://dx.doi.org/10.1214/07-EJS147 the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2008, Vol. 2, 368-411 | 10.1214/07-EJS147 | IMS-EJS-EJS_2007_147 | math.ST stat.TH | null | Multivariate statistics are often available as well as necessary in
hypothesis tests. We study how to use such statistics to control not only false
discovery rate (FDR) but also positive FDR (pFDR) with good power. We show that
FDR can be controlled through nested regions of multivariate $p$-values of test
statistics. If the distributions of the test statistics are known, then the
regions can be constructed explicitly to achieve FDR control with maximum power
among procedures satisfying certain conditions. On the other hand, our focus is
where the distributions are only partially known. Under certain conditions, a
type of nested regions are proposed and shown to attain (p)FDR control with
asymptotically maximum power as the pFDR control level approaches its
attainable limit. The procedure based on the nested regions is compared with
those based on other nested regions that are easier to construct as well as
those based on more straightforward combinations of the test statistics.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:00:17 GMT"
},
{
"version": "v2",
"created": "Wed, 21 May 2008 06:17:30 GMT"
}
] | 2008-05-21T00:00:00 | [
[
"Chi",
"Zhiyi",
""
]
] |
0706.0499 | Leo Alonso | Leovigildo Alonso, Ana Jeremias, Manuel Saorin | Classifying Compactly generated t-structures on the derived category of
a Noetherian ring | v2 41 pages, improved exposition. | J. Algebra 324 (2010), no. 3, pp. 313-346 | 10.1016/j.jalgebra.2010.04.023 | null | math.AG math.AT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We classify complactly generated t-structures on the derived category of
modules over a commutative Noetherian ring R in terms of decreasing filtrations
by supports on Spec(R). A decreasing filtration by supports \phi : Z -> Spec(R)
satisfies the weak Cousin condition if for any integer i \in Z, the set \phi(i)
contains all the inmediate generalizations of each point in \phi(i+1). Every
t-structure on D^b_fg(R) (equivalently, on D^-_fg(R)) is induced by complactly
generated t-structures on D(R) whose associated filtrations by supports satisfy
the weak Cousin condition. If the ring R has dualizing complex we prove that
these are exactly the t-structures on D^b_fg(R). More generally, if R has a
pointwise dualizing complex we classify all compactly generated t-structures on
D_fg(R).
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 18:54:52 GMT"
},
{
"version": "v2",
"created": "Tue, 16 Mar 2010 10:58:13 GMT"
}
] | 2017-04-27T00:00:00 | [
[
"Alonso",
"Leovigildo",
""
],
[
"Jeremias",
"Ana",
""
],
[
"Saorin",
"Manuel",
""
]
] |
0706.0500 | Mark Crockett Mr | R. M. Crockett, S. J. Smartt, J. J. Eldridge, S. Mattila, D. R. Young,
A. Pastorello, J. R. Maund, C. R. Benn, I. Skillen | A deeper search for the progenitor of the Type Ic Supernova 2002ap | 20 pages, 11 figures (resolution of images reduced), 6 tables.
Accepted for publication in MNRAS 2007 July 27 (received 2007 July 23; in
original form 2007 June 04) | null | 10.1111/j.1365-2966.2007.12283.x | null | astro-ph | null | (Abridged) We present a search for the progenitor star of the Type Ic
Supernova 2002ap in deep, high quality pre-explosion observations taken with
the Canada-France-Hawaii Telescope (CFHT). Aligning high-resolution Hubble
Space Telescope (HST) observations of the supernova itself with the archival
CFHT images allowed us to pinpoint the location of the progenitor site on the
ground based observations. We find that a source visible in the B and R band
pre-explosion images close to the position of the SN is (1) not coincident with
the SN position within the uncertainties of our relative astrometry, and (2) is
still visible ~ 4.7 yrs post-explosion in late-time observations taken with the
William Herschel Telescope. We therefore conclude that it is not the progenitor
of SN 2002ap. Comparing our luminosity limits with stellar models of single
stars at appropriate metallicity (Z=0.008) we conclude that any single star
progenitor must have experienced at least twice the standard mass loss rates
during pre-Wolf-Rayet evolution, been initially > 30-40M(Sun) and exploded as a
Wolf-Rayet star of final mass 10-12M(Sun). Alternatively an initially less
massive progenitor may have evolved in an interacting binary system. We
constrain any possible binary companion to a main sequence star of < 20M(Sun),
a neutron star or a black hole. By combining the pre-explosion limits with the
ejecta mass estimates and constraints from X-ray and radio observations we
conclude that any binary interaction most likely occurred as Case B mass
transfer, either with or without a subsequent common envelope evolution phase.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:23:09 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 18:11:54 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Jul 2007 16:29:01 GMT"
}
] | 2007-10-03T00:00:00 | [
[
"Crockett",
"R. M.",
""
],
[
"Smartt",
"S. J.",
""
],
[
"Eldridge",
"J. J.",
""
],
[
"Mattila",
"S.",
""
],
[
"Young",
"D. R.",
""
],
[
"Pastorello",
"A.",
""
],
[
"Maund",
"J. R.",
""
],
[
"Benn",
"C. R.",
""
],
[
"Skillen",
"I.",
""
]
] |
0706.0501 | Leonid P. Pryadko | Leonid P. Pryadko, Gregory Quiroz | Refocusing of a qubit system coupled to an oscillator | 2.5pages Conference proceedings for Nanostructures: Physics and
Technology, Novosibirsk (2007). Macros file nano2cmr.sty included | null | null | null | quant-ph | null | Refocusing, or dynamical decoupling, is a coherent control technique where
the internal dynamics of a quantum system is effectively averaged out by an
application of specially designed driving fields. The method has originated in
nuclear magnetic resonance, but it was independently discovered in atomic
physics as a ``coherent destruction of tunneling''. Present work deals with the
analysis of the performance of ``soft'' refocusing pulses and pulse sequences
in protecting the coherence of a qubit system coupled to a quantum oscillator.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:33:56 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Pryadko",
"Leonid P.",
""
],
[
"Quiroz",
"Gregory",
""
]
] |
0706.0502 | Eugen Zalinescu | Veronique Cortier, Michael Rusinovitch, Eugen Zalinescu | Relating two standard notions of secrecy | 29 pages, published in LMCS | Logical Methods in Computer Science, Volume 3, Issue 3 (July 6,
2007) lmcs:1093 | 10.2168/LMCS-3(3:2)2007 | null | cs.CR cs.LO | null | Two styles of definitions are usually considered to express that a security
protocol preserves the confidentiality of a data s. Reachability-based secrecy
means that s should never be disclosed while equivalence-based secrecy states
that two executions of a protocol with distinct instances for s should be
indistinguishable to an attacker. Although the second formulation ensures a
higher level of security and is closer to cryptographic notions of secrecy,
decidability results and automatic tools have mainly focused on the first
definition so far.
This paper initiates a systematic investigation of the situations where
syntactic secrecy entails strong secrecy. We show that in the passive case,
reachability-based secrecy actually implies equivalence-based secrecy for
digital signatures, symmetric and asymmetric encryption provided that the
primitives are probabilistic. For active adversaries, we provide sufficient
(and rather tight) conditions on the protocol for this implication to hold.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:30:33 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 09:06:10 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Cortier",
"Veronique",
""
],
[
"Rusinovitch",
"Michael",
""
],
[
"Zalinescu",
"Eugen",
""
]
] |
0706.0503 | Brian Baughman | B. M. Baughman, W. B. Atwood, R. P. Johnson, T. A. Porter, and M.
Ziegler | A Fresh Look at Diffuse Gamma-ray Emission from the Inner Galaxy | To appear in the Proceedings of the 30th ICRC, Merida, Mexico | null | null | null | astro-ph | null | The Energetic Gamma-Ray Experiment Telescope (EGRET) experiment onboard the
Compton Gamma-Ray Observatory (CGRO) has provided the most precise measurements
of the gamma-ray sky to date. The EGRET measurements of the diffuse emission
across the sky show an excess above 1 GeV. This ``GeV excess'' has been a topic
of great debate and interest since its original discovery by Hunter et al. in
1997. We have modified the GLAST simulation and reconstruction software to
model the EGRET instrument. This detailed modeling has allowed us to explore
the parameters of the EGRET instrument, in both its beam-test configuration and
in-orbit on CGRO, in greater detail than has previously been published. We have
found that the GeV excess is significantly increased when previously
unaccounted for instrumental effects are considered. We will present a new
measurement of diffuse gamma-ray emission in the inner Galaxy.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:38:26 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Baughman",
"B. M.",
""
],
[
"Atwood",
"W. B.",
""
],
[
"Johnson",
"R. P.",
""
],
[
"Porter",
"T. A.",
""
],
[
"Ziegler",
"M.",
""
]
] |
0706.0504 | Ching-Yuan Huang | C.-Y. Huang and M. Pohl | Monte Carlo Study of Cosmic-Ray Propagation in the Galaxy and Diffuse
Gamma-Ray Production | 4 pages; 6 figures; Contribution to the 30th ICRC, Merida, Mexico,
2007 | null | null | null | astro-ph | null | This work presents preliminary results for the time-dependent cosmic-ray
propagation in the Galaxy by a fully 3-dimensional Monte Carlo simulation. The
distribution of cosmic-rays (both protons and helium nuclei) in the Galaxy is
studied on various spatial scales for both constant and variable cosmic-ray
sources. The continuous diffuse gamma-ray emission produced by cosmic-rays
during the propagation is evaluated.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:38:41 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Huang",
"C. -Y.",
""
],
[
"Pohl",
"M.",
""
]
] |
0706.0505 | Xiaohua Zhu | Bin Zhou and Xiaohua Zhu | A note on the $K$-stability on toric manifolds | 8 pages | null | null | null | math.DG math.AG | null | In this note, we prove that on polarized toric manifolds the relative
$K$-stability with respect to Donaldson's toric degenerations is a necessary
condition for the existence of Calabi's extremal metrics, and also we show that
the modified $K$-energy is proper in the space of $G_0$-invariant K\"ahler
metrics for the case of toric surfaces which admit the extremal metrics.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:41:24 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Zhou",
"Bin",
""
],
[
"Zhu",
"Xiaohua",
""
]
] |
0706.0506 | Ching-Yuan Huang | C.-Y. Huang, M. Pohl, S.-E. Park and C. D. Daniels | Diffuse Gamma-Rays Produced in Cosmic-Ray Interactions and the TeV-band
Spectrum of RX J1713.7-3946 | 4 pages; 5 figures; Contribution to the 30th ICRC, Merida, Mexico,
2007; References included | null | null | null | astro-ph | null | We employ the Monte Carlo particle collision code DPMJET3.04 to determine the
multiplicity spectra of various secondary particles (in addition to $\pi^0$'s)
with $\gamma$'s as the final decay state, that are produced in cosmic-ray
($p$'s and $\alpha$'s) interactions with the interstellar medium. We derive an
easy-to-use $\gamma$-ray production matrix for cosmic rays with energies up to
about 10 PeV. This $\gamma$-ray production matrix is applied to the GeV excess
in diffuse Galactic $\gamma$-rays observed by EGRET, and we conclude the
non-$\pi^0$ decay components are insufficient to explain the GeV excess,
although they have contributed a different spectrum from the $\pi^0$-decay
component. We also test the hypothesis that the TeV-band $\gamma$-ray emission
of the shell-type SNR RX J1713.7-3946 observed with HESS is caused by hadronic
cosmic rays which are accelerated by a cosmic-ray modified shock. By the
$\chi^2$ statistics, we find a continuously softening spectrum is strongly
preferred, in contrast to expectations. A hardening spectrum has about 1%
probability to explain the HESS data, but then only if a hard cutoff at 50-100
TeV is imposed on the particle spectrum.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:47:49 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 22:01:44 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Huang",
"C. -Y.",
""
],
[
"Pohl",
"M.",
""
],
[
"Park",
"S. -E.",
""
],
[
"Daniels",
"C. D.",
""
]
] |
0706.0507 | Hichem Geryville | Hichem Geryville (LIESP), Yacine Ouzrout (LIESP), Abdelaziz Bouras
(LIESP), Nikolaos Sapidis | A collaborative framework to exchange and share product information
within a supply chain context | null | null | null | null | cs.HC | null | The new requirement for "collaboration" between multidisciplinary
collaborators induces to exchange and share adequate information on the
product, processes throughout the products' lifecycle. Thus, effective capture
of information, and also its extraction, recording, exchange, sharing, and
reuse become increasingly critical. These lead companies to adopt new improved
methodologies in managing the exchange and sharing of information. The aim of
this paper is to describe a collaborative framework system to exchange and
share information, which is based on: (i) The Product Process Collaboration
Organization model (PPCO) which defines product and process information, and
the various collaboration methods for the organizations involved in the supply
chain. (ii) Viewpoint model describes relationships between each actor and the
comprehensive Product/Process model, defining each actor's "domain of interest"
within the evolving product definition. (iii) A layer which defines the
comprehensive organization and collaboration relationships between the actors
within the supply chain. (iv) Based on the above relationships, the last layer
proposes a typology of exchanged messages. A communication method, based on
XML, is developed that supports optimal exchange/sharing of information. To
illustrate the proposed framework system, an example is presented related to
collaborative design of a new piston for an automotive engine. The focus is on
user-viewpoint integration to ensure that the adequate information is retrieved
from the PPCO.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:48:07 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Geryville",
"Hichem",
"",
"LIESP"
],
[
"Ouzrout",
"Yacine",
"",
"LIESP"
],
[
"Bouras",
"Abdelaziz",
"",
"LIESP"
],
[
"Sapidis",
"Nikolaos",
""
]
] |
0706.0508 | Panayotis Benetatos | Panayotis Benetatos and Annette Zippelius (University of Goettingen,
Germany) | Anisotropic Random Networks of Semiflexible Polymers | 5 pages, 2 figures; final version with expanded discussion to appear
in PRL | PRL 99, 198301 (2007) | 10.1103/PhysRevLett.99.198301 | null | cond-mat.soft cond-mat.dis-nn | null | Motivated by the organization of crosslinked cytoskeletal biopolymers, we
present a semimicroscopic replica field theory for the formation of anisotropic
random networks of semiflexible polymers. The networks are formed by
introducing random permanent crosslinks which fix the orientations of the
corresponding polymer segments to align with one another. Upon increasing the
crosslink density, we obtain a continuous gelation transition from a fluid
phase to a gel where a finite fraction of the system gets localized at random
positions. For sufficiently stiff polymers, this positional localization is
accompanied by a {\em continuous} isotropic-to-nematic (IN) transition occuring
at the same crosslink density. As the polymer stiffness decreases, the IN
transition becomes first order, shifts to a higher crosslink density, and is
preceeded by an orientational glass (statistically isotropic amorphous solid)
where the average polymer orientations freeze in random directions.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:59:31 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Oct 2007 20:22:25 GMT"
}
] | 2007-11-10T00:00:00 | [
[
"Benetatos",
"Panayotis",
"",
"University of Goettingen,\n Germany"
],
[
"Zippelius",
"Annette",
"",
"University of Goettingen,\n Germany"
]
] |
0706.0509 | Ching-Yuan Huang | C.-Y. Huang, S.-E. Park, M. Pohl and C. D. Daniels | Gamma-Rays Produced in Cosmic-Ray Interactions and the TeV-band Spectrum
of RX J1713.7-3946 | 3 pages; 4 figures; Contribution to the First GLAST Symposium,
Standord, 2007 | AIPConf.Proc.921:169-171,2007 | 10.1063/1.2757294 | null | astro-ph | null | We employ the Monte Carlo particle collision code DPMJET3.04 to determine the
multiplicity spectra of various secondary particles (in addition to $\pi^0$'s)
with $\gamma$'s as the final decay state, that are produced in cosmic-ray
($p$'s and $\alpha$'s) interactions with the interstellar medium. We derive an
easy-to-use $\gamma$-ray production matrix for cosmic rays with energies up to
about 10 PeV. This $\gamma$-ray production matrix is applied to the GeV excess
in diffuse Galactic $\gamma$-rays observed by EGRET, and we conclude the
non-$\pi^0$ decay components are insufficient to explain the GeV excess,
although they have contributed a different spectrum from the $\pi^0$-decay
component. We also test the hypothesis that the TeV-band $\gamma$-ray emission
of the shell-type SNR RX J1713.7-3946 observed with HESS is caused by hadronic
cosmic rays which are accelerated by a cosmic-ray modified shock. By the
$\chi^2$ statistics, we find a continuously softening spectrum is strongly
preferred, in contrast to expectations. A hardening spectrum has about 1%
probability to explain the HESS data, but then only if a hard cutoff at 50-100
TeV is imposed on the particle spectrum.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:54:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Huang",
"C. -Y.",
""
],
[
"Park",
"S. -E.",
""
],
[
"Pohl",
"M.",
""
],
[
"Daniels",
"C. D.",
""
]
] |
0706.0510 | Francesco Ginelli | F. Ginelli, P. Poggi, A. Turchi, H. Chat\'e, R. Livi and A. Politi | Characterizing dynamics with covariant Lyapunov vectors | 4 pages, 3 figures, submitted to Physical Review letters | Phys Rev Lett 99, 130601 (2007). | 10.1103/PhysRevLett.99.130601 | null | nlin.CD cond-mat.stat-mech | null | A general method to determine covariant Lyapunov vectors in both discrete-
and continuous-time dynamical systems is introduced. This allows to address
fundamental questions such as the degree of hyperbolicity, which can be
quantified in terms of the transversality of these intrinsic vectors. For
spatially extended systems, the covariant Lyapunov vectors have localization
properties and spatial Fourier spectra qualitatively different from those
composing the orthonormalized basis obtained in the standard procedure used to
calculate the Lyapunov exponents.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:55:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ginelli",
"F.",
""
],
[
"Poggi",
"P.",
""
],
[
"Turchi",
"A.",
""
],
[
"Chaté",
"H.",
""
],
[
"Livi",
"R.",
""
],
[
"Politi",
"A.",
""
]
] |
0706.0511 | Jie Yang | Paul L. H. Cook, Hirosi Ooguri and Jie Yang | Comments on the Holomorphic Anomaly in Open Topological String Theory | 3 pages | Phys.Lett.B653:335-337,2007 | 10.1016/j.physletb.2007.08.006 | CALT-68-2651 | hep-th | null | We show that a general solution to the extended holomorphic anomaly equations
for the open topological string on D-branes in a Calabi-Yau manifold, recently
written down by Walcher in arXiv:0705.4098, is obtained from the general
solution to the holomorphic anomaly equations for the closed topological string
on the same manifold, by shifting the closed string moduli by amounts
proportional to the 't Hooft coupling.
| [
{
"version": "v1",
"created": "Tue, 5 Jun 2007 19:26:16 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Cook",
"Paul L. H.",
""
],
[
"Ooguri",
"Hirosi",
""
],
[
"Yang",
"Jie",
""
]
] |
0706.0512 | Maury Goodman | Maury Goodman | Searching for the Neutrino Mixing Angle Theta-13 at Reactors | submitted to the proceedings of the XIIth International Workshop on
Neutrino Telescopes, Venice 2007 | null | null | null | hep-ex | null | Two neutrino mixing angles have been measured, and much of the neutrino
community is turning its attention to the unmeasured mixing angle, $\quq$,
whose best limit comes from the reactor neutrino experiment
CHOOZ.\cite{bib:chooz} New two detector reactor neutrino experiments are being
planned, along with more ambitious accelerator experiments, to measure or
further limit $\quq$. Here I will overview how to measure $\quq$ using reactor
neutrinos, mention some experiments that were considered and are not going
forward, and review the current status of four projects: Double Chooz in
France, Daya Bay in China, RENO in South Korea and Angra in Brazil. Finally I
will mention how the neutrino observer can gauge progress in these projects two
years from now as we approach the times corresponding to early estimates for
new results.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:01:36 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Goodman",
"Maury",
""
]
] |
0706.0513 | Duncan Farrah | D. Farrah (Cornell), J. Bernard-Salas (Cornell), H. W. W. Spoon
(Cornell), B. T. Soifer (Caltech), L. Armus (Caltech), B. Brandl (Leiden
University), V. Charmandaris (University of Crete and Observatoire de Paris),
V. Desai (Caltech), S. Higdon (Georgia Southern), D. Devost (Cornell), J.
Houck (Cornell) | High resolution mid-infrared spectroscopy of ultraluminous infrared
galaxies | 62 pages in preprint format, 4 tables, 23 figures. ApJ accepted | Astrophys.J.667:149-169,2007 | 10.1086/520834 | null | astro-ph | null | (Abridged) We present R~600, 10-37um spectra of 53 ULIRGs at z<0.32, taken
using the IRS on board Spitzer. All of the spectra show fine structure emission
lines of Ne, O, S, Si and Ar, as well as molecular Hydrogen lines. Some ULIRGs
also show emission lines of Cl, Fe, P, and atomic Hydrogen, and/or absorption
features from C_2H_2, HCN, and OH. We employ diagnostics based on the
fine-structure lines, as well as the EWs and luminosities of PAH features and
the strength of the 9.7um silicate absorption feature (S_sil), to explore the
power source behind the infrared emission in ULIRGs. We show that the IR
emission from the majority of ULIRGs is powered mostly by star formation, with
only ~20% of ULIRGs hosting an AGN with a comparable or greater IR luminosity
than the starburst. The detection of the 14.32um [NeV] line in just under half
the sample however implies that an AGN contributes significantly to the mid-IR
flux in ~42% of ULIRGs. The emission line ratios, luminosities and PAH EWs are
consistent with the starbursts and AGN in ULIRGs being more extincted, and for
the starbursts more compact, versions of those in lower luminosity systems. The
excitations and electron densities in the NLRs of ULIRGs appear comparable to
those of lower luminosity starbursts, though there is evidence that the NLR gas
in ULIRGs is more dense. We show that the combined luminosity of the 12.81um
[NeII] and 15.56um [NeIII] lines correlates with both IR luminosity and the
luminosity of the 6.2 micron and 11.2 micron PAH features in ULIRGs, and use
this to derive a calibration between PAH luminosity and star formation rate.
Finally, we show that ULIRGs with 0.8 < S_sil < 2.4 are likely to be powered
mainly by star formation, but that ULIRGs with S_sil < 0.8, and possibly those
with S_sil > 2.4, contain an IR-luminous AGN.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 20:00:03 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Farrah",
"D.",
"",
"Cornell"
],
[
"Bernard-Salas",
"J.",
"",
"Cornell"
],
[
"Spoon",
"H. W. W.",
"",
"Cornell"
],
[
"Soifer",
"B. T.",
"",
"Caltech"
],
[
"Armus",
"L.",
"",
"Caltech"
],
[
"Brandl",
"B.",
"",
"Leiden\n University"
],
[
"Charmandaris",
"V.",
"",
"University of Crete and Observatoire de Paris"
],
[
"Desai",
"V.",
"",
"Caltech"
],
[
"Higdon",
"S.",
"",
"Georgia Southern"
],
[
"Devost",
"D.",
"",
"Cornell"
],
[
"Houck",
"J.",
"",
"Cornell"
]
] |
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