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100 |
['eng']
|
['Khoury, J M', 'Ovrut, B A', 'Seiberg, N', 'Steinhardt, Paul Joseph', 'Turok, Neil G']
|
['From Big Crunch to Big Bang']
|
['Particle Physics - Theory']
|
['astrophysics, model', 'M-theory', 'dimension, 11', 'string model, heterotic', 'energy', 'field theory, scalar', 'space-time, Robertson-Walker', 'singularity', 'boundary condition', 'moduli space', 'model, ekpyrotic']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108187']
|
['We consider conditions under which a universe contracting towards a big crunch can make a transition to an expanding big bang universe. A promising example is 11-dimensional M-theory in which the eleventh dimension collapses, bounces, and re-expands. At the bounce, the model can reduce to a weakly coupled heterotic string theory and, we conjecture, it may be possible to follow the transition from contraction to expansion. The possibility opens the door to new classes of cosmological models. For example, we discuss how it suggests a major simplification and modification of the recently proposed ekpyrotic scenario.']
|
['2001-09-14']
|
101 |
['eng']
|
['Ghilencea, D M', 'Nibbelink, S G', 'Nilles, Hans Peter']
|
['Gauge corrections and FI-term in 5D KK theories']
|
['Particle Physics - Theory']
|
['Kaluza-Klein model', 'dimension, 5', 'field theory, scalar', 'correction, gauge', 'supersymmetry', 'spontaneous compactification, orbifold', 'Higgs particle, mass']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108184']
|
["In the context of a five dimensional N=1 Kaluza Klein model compactified on S_1/Z_2 x Z_2' we compute the one-loop gauge corrections to the self energy of the (zero-mode) scalar field. The result is quadratically divergent due to the appearance of a Fayet-Iliopoulos term."]
|
['2001-08-27']
|
102 |
['eng']
|
['Nojiri, S', 'Odintsov, S D', 'Ogushi, S']
|
['Cosmological and black hole brane-world Universes in higher derivative gravity']
|
['Particle Physics - Theory']
|
['gravitation', 'derivative, high', 'dimension, 5', 'boundary condition', 'membrane model, de Sitter', 'dimension, 4', 'black hole, anti-de Sitter', 'thermodynamics', 'entropy', 'energy', 'Friedman model', 'field theory, conformal', 'duality', 'holography', 'space-time, background', 'violation, Lorentz', 'Gauss-Bonnet term', 'anomaly, conformal', 'central charge', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108172']
|
['General model of multidimensional $R^2$-gravity including Riemann tensor square term (non-zero $c$ case) is considered. The number of brane-worlds in such model is constructed (mainly in five dimensions) and their properties are discussed. Thermodynamics of S-AdS BH (with boundary) is presented when perturbation on $c$ is used. The entropy, free energy and energy are calculated. For non-zero $c$ the entropy (energy) is not proportional to the area (mass). The equation of motion of brane in BH background is presented as FRW equation. Using dual CFT description it is shown that dual field theory is not conformal one when $c$ is not zero. In this case the holographic entropy does not coincide with BH entropy (they coincide for Einstein gravity or $c=0$ HD gravity where AdS/CFT description is well applied). Asymmetrically warped background (analog of charged AdS BH) where Lorentz invariance violation occurs is found. The cosmological 4d dS brane connecting two dS bulk spaces is formulated in terms of parameters of $R^2$-gravity. Within proposed dS/CFT correspondence the holographic conformal anomaly from five-dimensional higher derivative gravity in de Sitter background is evaluated.']
|
['2001-08-24']
|
103 |
['eng']
|
['Tighe, J F']
|
['Derivative Expansions of the Exact Renormalisation Group and SU(N|N) Gauge Theory']
|
['Particle Physics - Theory']
|
['Thesis']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108051']
|
['We investigate the convergence of the derivative expansion of the exact renormalisation group, by using it to compute the beta function of scalar theory. We demonstrate that the derivative expansion of the Polchinski flow equation converges at one loop for certain fast falling smooth cutoffs. The derivative expansion of the Legendre flow equation trivially converges at one loop, but also at two loops: slowly with sharp cutoff (as a momentum-scale expansion), and rapidly in the case of a smooth exponential cutoff. We also show that the two loop contributions to certain higher derivative operators (not involved in beta) have divergent momentum-scale expansions for sharp cutoff, but the smooth exponential cutoff gives convergent derivative expansions for all such operators with any number of derivatives. In the latter part of the thesis, we address the problems of applying the exact renormalisation group to gauge theories. A regularisation scheme utilising higher covariant derivatives and the spontaneous symmetry breaking of the gauge supergroup SU(N|N) is introduced and it is demonstrated to be finite to all orders of perturbation theory.']
|
['2001-08-09']
|
104 |
['eng']
|
['Turner, M D']
|
['The derivative expansion of the exact renormalization group']
|
['Particle Physics - Theory']
|
['Thesis']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108031']
|
['We formulate a method of performing non-perturbative calculations in quantum field theory, based upon a derivative expansion of the exact renormalization group. We then proceed to apply this method to the calculation of critical exponents for three dimensional O(N) symmetric theory. Finally we discuss how the approximation scheme manages to reproduce some exactly known solutions in critical phenomena.']
|
['2001-09-14']
|
105 |
['eng']
|
['Harvey-Fros, C']
|
['The local potential approximation of the renormalization group']
|
['Particle Physics - Theory']
|
['Thesis', 'Thesis']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0108018']
|
["We introduce Wilson's, or Polchinski's, exact renormalization group, and review the Local Potential Approximation as applied to scalar field theory. Focusing on the Polchinski flow equation, standard methods are investigated, and by choosing restrictions to some sub-manifold of coupling constant space we arrive at a very promising variational approximation method. Within the Local Potential Approximation, we construct a function, C, of the coupling constants; it has the property that (for unitary theories) it decreases monotonically along flows and is stationary only at fixed points - where it `counts degrees of freedom', i.e. is extensive, counting one for each Gaussian scalar. In the latter part of the thesis, the Local Potential Approximation is used to derive a non-trivial Polchinski flow equation to include Fermi fields. Our flow equation does not support chirally invariant solutions and does not reproduce the features associated with the corresponding invariant theories. We solve both for a finite number of components, N, and within the large N limit. The Legendre flow equation provides a comparison with exact results in the large N limit. In this limit, it is solved to yield both chirally invariant and non-invariant solutions."]
|
['2001-08-06']
|
106 |
['eng']
|
['Akhmedov, E K']
|
['Dynamical localization of gauge fields on a brane']
|
['Particle Physics - Theory']
|
['membrane model', 'gauge field theory', 'field theory, scalar', 'fermion', 'model, composite', 'dimension, 4', 'dimension, 5', 'invariance, gauge', 'charge, universality', 'gauge boson, propagator']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107223']
|
['We propose a dynamical mechanism of localization of gauge fields on a brane in which gauge bosons are excitations of the brane itself or composites made out of matter fields localized on the brane. The mechanism is operative for both Abelian and non-Abelian gauge fields. Several scalar and scalar-fermion composite models of gauge fields are considered. The models exhibit exact gauge invariance and therefore charge universality of gauge interactions is automatically preserved. The mechanism is shown to be equivalent to a modification of the Dvali, Gabadadze and Shifman scenario in which gauge bosons have no bulk kinetic terms and only possess induced kinetic terms on the brane.']
|
['2001-07-26']
|
107 |
['eng']
|
['Kazhdan, D', 'Pioline, B', 'Waldron, A']
|
['Minimal representations, spherical vectors, and exceptional theta series I']
|
['Particle Physics - Theory']
|
['membrane model', 'dimension, 11', 'group theory, SU(2)', 'group theory, representation', 'group theory, symplectic', 'vector, symplectic', 'Born-Infeld model', 'duality', 'group theory, E(6)', 'group theory, E(7)', 'group theory, E(8)', 'group theory, D(N)', 'number theory']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107222']
|
['Theta series for exceptional groups have been suggested as a possible description of the eleven-dimensional quantized BPS membrane. We present explicit formulae for these automorphic forms whenever the underlying Lie group $G$ is simply laced. Specifically, we review and construct explicitly the minimal representation of $G$ which generalizes the Schr\\"odinger representation of symplectic groups. The real spherical vector invariant under the maximal compact subgroup is computed in this representation and yields the action appearing in the summand of the automorphic theta series. The summation measure can be obtained from the p-adic form of the spherical vector and is left to the sequel of this paper. The simplicity of our result is suggestive of a new Born-Infeld-like description of the membrane where U-duality is realized non-linearly. Our results may also be used in constructing quantum mechanical systems with hidden non-compact symmetries.']
|
['2001-07-26']
|
108 |
['eng']
|
['Gies, H', 'Wetterich, C']
|
['Renormalization Flow of Bound States']
|
['Particle Physics - Theory']
|
['bound state, scalar', 'renormalization group, fixed point', 'effective action', 'Jona-Lasinio-Nambu model', 'weak coupling, gauge', 'transformation, nonlinear', 'scaling, dependence', 'bosonization', 'four-fermion interaction', 'quantum electrodynamics, massless', 'symmetry, spontaneously broken', 'symmetry, chiral', 'gauge field theory', 'numerical calculations']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107221']
|
['A renormalization group flow equation with a scale-dependent transformation of field variables gives a unified description of fundamental and composite degrees of freedom. In the context of the effective average action, we study the renormalization flow of scalar bound states which are formed out of fundamental fermions. We use the gauged Nambu--Jona-Lasinio model at weak gauge coupling as an example. Thereby, the notions of bound state or fundamental particle become scale dependent, being classified by the fixed-point structure of the flow of effective couplings.']
|
['2001-07-26']
|
109 |
['eng']
|
['Corrado, R A', 'Pilch, K', 'Warner, N P']
|
['An N = 2 Supersymmetric Membrane Flow']
|
['Particle Physics - Theory']
|
['membrane model', 'supersymmetry', 'gauge field theory, Yang-Mills', 'M-theory', 'field theory, scalar', 'fermion', 'dimension, 3', 'duality', 'infrared problem, fixed point', 'geometry, deformation', 'renormalization group, holography', 'dimension, 4', 'space-time, singularity']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107220']
|
['We find M-theory solutions that are holographic duals of flows of the maximally supersymmetric N=8 scalar-fermion theory in (2+1) dimensions. In particular, we construct the M-theory solution dual to a flow in which a single chiral multiplet is given a mass, and the theory goes to a new infra-red fixed point. We also examine this new solution using M2-brane probes. The (2+1)-dimensional field theory fixed-point is closely related to that of Leigh and Strassler, while the M-theory solution is closely related to the corresponding IIB flow solution. We recast the IIB flow solution in a more geometric manner and use this to obtain an Ansatz for the M-theory flow. We are able to generalize our solution further to obtain flows with del Pezzo sub-manifolds, and we give an explicit solution with a conifold singularity.']
|
['2001-07-26']
|
110 |
['eng']
|
['Hoshino, Y']
|
['The Gauge Technique in QED_{2+1}']
|
['Particle Physics - Theory']
|
['quantum electrodynamics', 'dimension, 3', 'approximation, quenching', 'fermion, propagator', 'threshold', 'spectral representation', 'Landau gauge', 'vertex function', 'Dyson-Schwinger equation', 'mass generation', 'Ward-Takahashi identity']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107219']
|
['The Gauge Technique has been applied to QED$_{2+1}$ in the quenched case with infrared subtraction. The behaviour of the fermion propagator near the threshold is then found to be \\[ S(p)\\to \\frac{(\\gamma \\cdot p+m)}{(p^{2}-m^{2})}(\\frac{p^{2}-m^{2}}{% 2m^{2}})^{\\zeta}\\exp (-\\frac{\\eta \\varsigma}{2}), \\] where $\\varsigma =e^{2}/(4\\pi m)$ and this is gauge invariant except the exponential factor. We also find a spectral function in the Landau and Yennie like gauge. The propagators $S(p)$ are expressed in terms of $\\Phi (z,1,\\varsigma)$ explicitly .The vacuum expectation value $< \\overline{\\psi}\\psi >$ is gauge dependent . Thus dynamical mass generation does not occur.']
|
['2001-07-26']
|
111 |
['eng']
|
['Williams, B']
|
['D-branes and Cosmological Singularities']
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'space-time, singularity', 'field equations, solution']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107218']
|
['The motion of a test Dq-brane in a Dp-brane background is studied. The induced metric on the test brane is then interpreted as the cosmology of the test brane universe. One is then able to resolve the resulting cosmological singularities. In particular, for a D3-brane in a D5-brane background, one finds a 3+1 dimensional FRW universe with equation of state $p = \\ed$. It has been argued that this may have been the dominant form of matter at very early times.']
|
['2001-07-26']
|
112 |
['eng']
|
['Muto, T', 'Tani, T']
|
['Stability of Quiver Representations and Topology Change']
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'moduli space', 'orbifold', 'representation, stability', 'representation, quiver', 'geometry', 'monodromy', 'topology']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107217']
|
['We study phase structure of the moduli space of a D0-brane on the orbifold C^3/Z_2 \\times Z_2 based on stability of quiver representations. It is known from an analysis using toric geometry that this model has multiple phases connected by flop transitions. By comparing the results of the two methods, we obtain a correspondence between quiver representations and geometry of toric resolutions of the orbifold. It is shown that a redundancy of coordinates arising in the toric description of the D-brane moduli space, which is a key ingredient of disappearance of non-geometric phases, is understood from the monodromy around the orbifold point. We also discuss why only geometric phases appear from the viewpoint of stability of D0-branes.']
|
['2001-09-14']
|
113 |
['eng']
|
['Chan, C S', 'Hashimoto, A', 'Verlinde, Herman L']
|
['Duality Cascade and Oblique Phases in Non-Commutative Open String Theory']
|
['Particle Physics - Theory']
|
['string model, noncommutative', 'string, open', 'critical phenomena', 'duality, transformation', 'fractals', 'dimension, 2', 'S-duality, SL(2,Z)']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107215']
|
['We investigate the complete phase diagram of the decoupled world-sheet theory of (P,Q) strings. These theories include 1+1 dimensional super Yang-Mills theory and non-commutative open string theory. We find that the system exhibits a rich fractal phase structure, including a cascade of alternating supergravity, gauge theory, and matrix string theory phases. The cascade proceeds via a series of SL(2,Z) S-duality transformations, and depends sensitively on P and Q. In particular, we find that the system may undergo multiple Hagedorn-type transitions as the temperature is varied.']
|
['2001-07-25']
|
114 |
['eng']
|
['Pando-Zayas, L A']
|
['On a Deformation of 3-Branes']
|
['Particle Physics - Theory']
|
['membrane model, p-brane', 'p-brane, 3', 'membrane, deformation', 'supergravity', 'gauge field theory', 'conifold', 'Wilson loop']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107213']
|
['We construct an explicit class of solutions of type IIB supergravity that is a smooth deformation of the 3-brane class of solutions. The solution is nonsupersymmetric and involves nontrivial dilaton and axion fields as well as the standard 5-form field strength. One of the main features of the solution is that for large values of the radius the deformation is small and it asymptotically approaches the undeformed 3-brane solution, signaling a restoration of conformal invariance in the UV for the dual gauge theory. We suggest that the supergravity deformation corresponds to a massive deformation on the dual gauge theory and consequently the deformed theory has the undeformed one as an ultraviolet fixed point. In cases where the original 3-brane solution preserves some amount of supersymmetry we suggest that the gauge theory interpretation is that of soft supersymmetry breaking. We discuss the deformation for D3-branes on the conifold and the generalized conifold explicitly. We show that the semiclassical behavior of the Wilson loop suggests that the corresponding gauge theory duals are confining.']
|
['2001-07-25']
|
115 |
['eng']
|
['Heslop, P J', 'Howe, Paul S']
|
['OPEs and 3-point correlators of protected operators in N=4 SYM']
|
['Particle Physics - Theory']
|
['gauge field theory, Yang-Mills', 'supersymmetry, superspace', 'correlation function', 'operator product expansion', 'multiplet, chiral', 'two-point function', 'n-point function, 3', 'operator, composite', 'group theory, PSU(2,2|4)', 'group theory, representation', 'analytic properties', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107212']
|
['Two- and three-point correlation functions of arbitrary protected operators are constructed in N=4 SYM using analytic superspace methods. The OPEs of two chiral primary multiplets are given. It is shown that the $n$-point functions of protected operators for $n\\leq4$ are invariant under $U(1)_Y$ and it is argued that this implies that the two- and three-point functions are not renormalised. It is shown explicitly how unprotected operators can be accommodated in the analytic superspace formalism in a way which is fully compatible with analyticity. Some new extremal correlators are exhibited.']
|
['2001-07-25']
|
116 |
['eng']
|
['Przanowski, M', 'Plebanski, J F', 'Formanski, S']
|
['Deformation Quantization of sdiff($\\Sigma_{2}$) SDYM Equation']
|
['Particle Physics - Theory']
|
['gauge field theory, Yang-Mills', 'quantization, deformation', 'diffeomorphism', 'master equation', 'operator, Lax', 'charge, conservation law', 'nonlocal', 'hidden symmetry', 'algebra, Lie', 'twistor']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107211']
|
['Deformation quantization (the Moyal deformation) of SDYM equation for the algebra of the area preserving diffeomorphisms of a 2-surface $\\Sigma_{2}$, sdiff($\\Sigma_{2}$), is studied. Deformed equation we call the master equation (ME) as it can be reduced to many integrable nonlinear equations in mathematical physics. Two sets of concerved charges for ME are found. Then the linear systems for ME (the Lax pairs) associated with the conserved charges are given. We obtain the dressing operators and the infinite algebra of hidden symmetries of ME. Twistor construction is also done.']
|
['2001-07-25']
|
117 |
['eng']
|
['Abreu, E M C', 'Dalmazi, D', 'Silva, E A']
|
['The Jacobi identity for Dirac-like brackets']
|
['Particle Physics - Theory']
|
['constraint', 'Jacobi identity', 'superparticle', 'dimension, 10', 'spin, fractional', 'dimension, 3']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107210']
|
['For redundant second-class constraints the Dirac brackets cannot be defined and new brackets must be introduced. We prove here that the Jacobi identity for the new brackets must hold on the surface of the second-class constraints. In order to illustrate our proof we work out explicitly the cases of a fractional spin particle in 2+1 dimensions and the original Brink-Schwarz massless superparticle in D=10 dimensions in a Lorentz covariant constraints separation.']
|
['2001-07-25']
|
118 |
['eng']
|
['Lambert, N D', 'West, Peter C']
|
['Coset Symmetries in Dimensionally Reduced Bosonic String Theory']
|
['Particle Physics - Theory']
|
['boson, string model', 'dimensional reduction', 'coset space', 'gravitation', 'effective action', 'group theory, Geroch', 'algebra, Kac-Moody', 'M-theory', 'differential forms', 'dilaton']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107209']
|
['We discuss the dimensional reduction of various effective actions, particularly that of the closed Bosonic string and pure gravity, to two and three dimensions. The result for the closed Bosonic string leads to coset symmetries which are in agreement with those recently predicted and argued to be present in a new unreduced formulation of this theory. We also show that part of the Geroch group appears in the unreduced duality symmetric formulation of gravity recently proposed. We conjecture that this formulation can be extended to a non-linear realisation based on a Kac-Moody algebra which we identify. We also briefly discuss the proposed action of Bosonic M-theory.']
|
['2001-07-25']
|
119 |
['eng']
|
['Zerbini, S']
|
['The Multiplicative Anomaly of Regularized Functional Determinants']
|
['Particle Physics - Theory']
|
['talk, Naples 2001/07/02', 'field theory, scalar', 'operator, differential', 'determinant', 'zeta function, regularization', 'anomaly', 'partition function', 'operator, Dirac']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107208']
|
['The multiplicative anomaly related to the functional regularized determinants involving products of elliptic operators is introduced and some of its properties discussed. Its relevance concerning the mathematical consistency is stressed. With regard to its possible physical relevance, some examples are illustrated.']
|
['2001-07-25']
|
120 |
['eng']
|
['Carey, A L', 'Mickelsson, J']
|
['The universal gerbe, Dixmier-Douady class, and gauge theory']
|
['Particle Physics - Theory']
|
['gauge field theory, Yang-Mills', 'fibre bundle', 'algebra, Lie', 'charge, topological', 'mathematical methods']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107207']
|
["We clarify the relation between the Dixmier-Douady class on the space of self adjoint Fredholm operators (`universal B-field') and the curvature of determinant bundles over infinite-dimensional Grassmannians. In particular, in the case of Dirac type operators on a three dimensional compact manifold we obtain a simple and explicit expression for both forms."]
|
['2001-07-25']
|
121 |
['eng']
|
['Ivanov, M G']
|
['Intersecting delocalized p-branes']
|
['Particle Physics - Theory']
|
['membrane model, p-brane', 'supergravity', 'field equations', 'Einstein-Maxwell equation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107206']
|
['A model considered in the paper generalizes supergravity type model to the case of delocalized membrane sources. A generalization of intersecting p-brane solution with delocalized membranes is presented.']
|
['2001-07-25']
|
122 |
['eng']
|
['Cotaescu, I I', 'Visinescu, M']
|
['Hierarchy of Dirac, Pauli and Klein-Gordon conserved operators in Taub-NUT background']
|
['Particle Physics - Theory']
|
['operator, Dirac', 'space-time, Taub-NUT', 'Kaluza-Klein model', 'magnetic monopole', 'dimension, 5', 'Klein-Gordon equation', 'invariance, SO(4,1)', 'operator, algebra', 'conservation law', 'operator, Pauli']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107205']
|
['The algebra of conserved observables of the SO(4,1) gauge-invariant theory of the Dirac fermions in the external field of the Kaluza-Klein monopole is investigated. It is shown that the Dirac conserved operators have physical parts associated with Pauli operators that are also conserved in the sense of the Klein-Gordon theory. In this way one gets simpler methods of analyzing the properties of the conserved Dirac operators and their main algebraic structures including the representations of dynamical algebras governing the Dirac quantum modes.']
|
['2001-07-25']
|
123 |
['eng']
|
['Maru, N', 'Sakai, N', 'Sakamura, Y', 'Sugisaka, R']
|
['Simple SUSY Breaking Mechanism by Coexisting Walls']
|
['Particle Physics - Theory']
|
['supersymmetry, symmetry breaking', 'domain wall', 'effective Lagrangian', 'low-energy theorem', 'Wess-Zumino model', 'dimension, 3', 'dimension, 4']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107204']
|
['A SUSY breaking mechanism with no messenger fields is proposed. We assume that our world is on a domain wall and SUSY is broken only by the coexistence of another wall with some distance from our wall. We find an ${\\cal N}=1$ model in four dimensions which admits an exact solution of a stable non-BPS configuration of two walls and studied its properties explicitly. We work out how various soft SUSY breaking terms can arise in our framework. Phenomenological implications are briefly discussed. We also find that effective SUSY breaking scale becomes exponentially small as the distance between two walls grows.']
|
['2001-07-25']
|
124 |
['eng']
|
['Moriyama, S']
|
['USp(32) String as Spontaneously Supersymmetry Broken Theory']
|
['Particle Physics - Theory']
|
['supersymmetry, symmetry breaking', 'orientifold', 'string model, USp(32)', 'symmetry, spontaneously broken', 'Goldstino']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107203']
|
['It was suggested by Sugimoto that there is a new supersymmetry breaking mechanism by an orientifold plane which is oppositely charged as the usual one. Here we prove the trace formula for this system to show that the supersymmetry is broken not explicitly but spontaneously. We also discuss the possibility of interpreting the orientifold plane as an intrinsic object of the superstring theory.']
|
['2001-07-25']
|
125 |
['eng']
|
['Nayeri, A', 'Reynolds, A']
|
['Gravitomagnetism in Brane-Worlds']
|
['Particle Physics - Theory']
|
['membrane model', 'Randall-Sundrum model', 'gravitation, magnetic', 'relativity theory, general', 'space-time, Kerr', 'space-time, anti-de Sitter', 'dimension, 5']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107201']
|
["In this paper we discuss a physical observable which is drastically different in a brane-world scenario. To date, the Randall-Sundrum model seems to be consistent with all experimental tests of general relativity. Specifically, we examine the so-called gravitomagnetic effect in the context of the Randall-Sundrum (RS) model. This treatment, of course, assumes the recovery of the Kerr metric in brane-worlds which we have found to the first order in the ratio of the brane separation to the radius of the AdS$_5$, $(\\ell/r)$. We first show that the second Randall-Sundrum model of one brane leaves the gravitomagnetic effect unchanged. Then, we consider the two-brane scenario of the original Randall-Sundrum proposal and show that the magnitude of the gravitomagnetic effect depends heavily on the ratio of $(\\ell/r)$. Such dependence is a result of the geometrodynamic spacetime and does not appear in static scenarios. We hope that we will be able to test this proposal experimentally with data from NASA's Gravity Probe B (GP-B)and possibly disprove either the Randall-Sundrum two-brane scenario or standard general relativity."]
|
['2001-07-25']
|
126 |
['eng']
|
['Hellerman, S', 'Susskind, Leonard']
|
['Realizing the Quantum Hall System in String Theory']
|
['Particle Physics - Theory']
|
['Hall effect', 'string model', 'Chern-Simons term', 'matrix model', 'membrane model, open']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107200']
|
["In a recent paper Bernevig, Brodie, Susskind and Toumbas constructed a brane realization of the Quantum Hall fluid. Since then it has been realized that the Quantum Hall system is very closely related to non--commutative Chern Simons theory and this suggests alternative brane constructions which we believe are more reliable and clear. In this paper a brane construction is given for the non--commutative Chern Simons Matrix formulation of the Quantum Hall system as described by in recent papers by Susskind, Polychronakos and by Hellerman and Van Raamsdonk. The system is a generalized version of Berkooz's ``Rigid Light Cone Membrane which occurs as an excition of the DLCQ description of the M5--brane in a background 3--form field. The original construction of Berkooz corresponds to the fully filled $\\nu =1$ state of the QH system. To change the filling fraction to $\\nu = 1/(k+1)$ a system of $k$ background D8-branes is required. Quasi--hole excitations can be generated by passing a D6-brane though the Rigid Membrane."]
|
['2001-09-14']
|
127 |
['eng']
|
['Intriligator, K', 'Kumar, J']
|
['*-Wars Episode I']
|
['Particle Physics - Theory']
|
['string model', 'anomaly, gauge', 'gauge field theory, noncommutative', 'Wess-Zumino term', 'anomaly, U(1)', 'infrared problem', 'renormalization', 'Higgs model, noncommutative', 'fermion, chiral']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107199']
|
["As pointed out, chiral non-commutative theories exist, and examples can be constructed via string theory. Gauge anomalies require the matter content of individual gauge group factors, including U(1) factors, to be non-chiral. All ``bad'' mixed gauge anomalies, and also all ``good'' (e.g. for $\\pi ^0\\to \\gamma \\gamma$) ABJ type flavor anomalies, automatically vanish in non-commutative gauge theories. We interpret this as being analogous to string theory, and an example of UV/IR mixing: non-commutative gauge theories automatically contain ``closed string,'' Green-Schwarz fields, which cancel these anomalies."]
|
['2001-07-24']
|
128 |
['eng']
|
['Cline, J M', 'Firouzjahi, H']
|
['No-Go Theorem for Horizon-Shielded Self-Tuning Singularities']
|
['Particle Physics - Theory']
|
['membrane model', 'astrophysics, fundamental constant', 'space-time, singularity', 'Gauss-Bonnet term', 'dimension, 5', 'symmetry, Z(2)', 'Einstein equation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107198']
|
['We derive a simple no-go theorem relating to self-tuning solutions to the cosmological constant for observers on a brane, which rely on a singularity in an extra dimension. The theorem shows that it is impossible to shield the singularity from the brane by a horizon, unless the positive energy condition (rho+p >= 0) is violated in the bulk or on the brane. The result holds regardless of the kinds of fields which are introduced in the bulk or on the brane, whether Z_2 symmetry is imposed at the brane, or whether higher derivative terms of the Gauss-Bonnet form are added to the gravitational part of the action. However, the no-go theorem can be evaded if the three-brane has spatial curvature. We discuss explicit realizations of such solutions which have both self-tuning and a horizon shielding the singularity.']
|
['2001-07-24']
|
129 |
['eng']
|
['Arefieva, I Y', 'Belov, D M', 'Koshelev, A S', 'Medvedev, P B']
|
['Gauge Invariance and Tachyon Condensation in Cubic Superstring Field Theory']
|
['Particle Physics - Theory']
|
['field theory, string', 'string, open', 'supersymmetry', 'invariance, gauge', 'tachyon, condensation', 'tachyon, potential', 'orbit, gauge', 'gauge fixing', 'boson, string model', 'numerical calculations']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107197']
|
['The gauge invariance of cubic open superstring field theory is considered in a framework of level truncation, and applications to the tachyon condensation problem are discussed. As it is known, in the bosonic case the Feynman-Siegel gauge is not universal within the level truncation method. We explore another gauge that is more suitable for calculation of the tachyon potential for fermionic string at level (2,6). We show that this new gauge has no restrictions on the region of its validity at least at this level.']
|
['2001-07-24']
|
130 |
['eng']
|
['Ellwanger, Ulrich', 'Wschebor, N']
|
['Confinement with Kalb - Ramond Fields']
|
['Particle Physics - Theory']
|
['gauge field theory, U(1)', 'field theory, action', 'renormalization', 'gauge field theory, SU(N)', 'gauge, abelian', 'expansion 1/N, color', 'critical phenomena, confinement', 'symmetry, gauge', 'duality, transformation', 'magnetic monopole', 'Wilson loop', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107196']
|
['We consider models with N U(1) gauge fields A_{\\mu}^n, N Kalb-Ramond fields B_{\\mu \\nu}^n, an arbitrary bare action and a fixed UV cutoff \\Lambda. Under mild assumptions these can be obtained as effective low energy theories of SU(N+1) Yang Mills theories in the maximal abelian gauge. For a large class of bare actions they can be solved in the large N limit and exhibit confinement. The confining phase is characterized by an approximate "low energy" vector gauge symmetry under which the Kalb-Ramond fields B_{\\mu\\nu}^n transform. The same symmetry allows for a duality transformation showing that magnetic monopoles have condensed. The models allow for various mechanisms of confinement, depending on which sources for A_{\\mu}^n or B_{\\mu \\nu}^n are switched on, but the area law for the Wilson loop is obtained in any case.']
|
['2001-07-24']
|
131 |
['eng']
|
['Tomasiello, A']
|
['A-infinity structure and superpotentials']
|
['Particle Physics - Theory']
|
['algebra, A(N)', 'superpotential', 'homology', 'symmetry, mirror', 'field theory, string', 'moduli space']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107195']
|
['A-infinity algebras and categories are known to be the algebraic structures behind open string field theories. In this note we comment on the relevance of the homology construction of A-infinity categories to superpotentials.']
|
['2001-07-24']
|
132 |
['eng']
|
['Derkachov, S E', 'Korchemsky, G P', 'Manashov, A N']
|
['Noncompact Heisenberg spin magnets from high-energy QCD; 1 Baxter Q-operator and Separation of Variables']
|
['Particle Physics - Theory']
|
['quantum chromodynamics', 'Heisenberg model, noncompact', 'integrability', 'dimension, 2', 'Yang-Baxter equation, solution', 'group theory, SL(2,C)', 'R-matrix', 'energy spectrum', 'spectral representation', 'effective Hamiltonian', 'Feynman graph']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107193']
|
["We analyze a completely integrable two-dimensional quantum-mechanical model that emerged in the recent studies of the compound gluonic states in multi-color QCD at high energy. The model represents a generalization of the well-known homogenous Heisenberg spin magnet to infinite-dimensional representations of the SL(2,C) group and can be reformulated within the Quantum Inverse Scattering Method. Solving the Yang-Baxter equation, we obtain the R-matrix for the SL(2,C) representations of the principal series and discuss its properties. We explicitly construct the Baxter Q-operator for this model and show how it can be used to determine the energy spectrum. We apply Sklyanin's method of the Separated Variables to obtain an integral representation for the eigenfunctions of the Hamiltonian. We demonstrate that the language of Feynman diagrams supplemented with the method of uniqueness provide a powerful technique for analyzing the properties of the model."]
|
['2001-07-24']
|
133 |
['eng']
|
['Endo, R', 'Seo, K', 'Sugamoto, A']
|
['Old Fashioned Duality for D-brane and String']
|
['Particle Physics - Theory']
|
['string model, closed', 'vortex, magnetic', 'Higgs model, abelian', 'membrane model, D-brane', 'duality', 'boson, string model', 'supersymmetry', 'invariance, reparametrization', 'bosonization']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107191']
|
['Old fashioned duality used to derive the closed string field theory for magnetic vortex from the gauge theory with Higgs scalar, is applied to the string theories. The bosonic sring theory coupled to the Kalb-Ramond 2-form field is dually transformed to the 6-brane theory coupled to the 7-form field. The old fashioned dual transformation is also examined for the Type IIA and IIB superstrings. For this study, the string field theoretical treatment of the bosonic and fermionic strings is developped based on the reparametrization invariant formulation of strings by Marshall and Ramond. In order for the self-duality of the Type IIB superstring to appear, the following dual correspondence may happen: the dual transformation of the NS-NS field functional is the bosonization of the R-R one.']
|
['2001-07-24']
|
134 |
['eng']
|
['Hikida, Y', 'Sugawara, Y']
|
['Boundary States of D-branes in AdS_3 Based on Discrete Series']
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'space-time, anti-de Sitter', 'dimension, 3', 'string model, open', 'string model, closed', 'duality', 'boundary condition', 'unitarity', 'supersymmetry', 'spectra, BPS']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107189']
|
['We study the D-branes in the Lorentzian AdS_3 background from the viewpoints of boundary states, emphasizing the role of open-closed duality in string theory. Working on the world-sheet with the Lorentzian signature, we construct the Cardy states based on the discrete series. We show that they are compatible with (1) the unitarity and normalizability, and (2) the spectral flow symmetry, in the open string spectrum. We also discuss the brane interpretation of them. We further show that, in the case of superstring on AdS_3 \\times S^3 \\times T^4, our Cardy states yield an infinite number of physical BPS states in the open string channel, on which the spectral flows consistently act.']
|
['2001-07-24']
|
135 |
['eng']
|
['Chakraborty, D', 'Harindranath, A']
|
['Mesons in Light-Front QCD$_{2+1$}']
|
['Particle Physics - Theory']
|
['quantum chromodynamics, light front', 'dimension, 3', 'effective Hamiltonian', 'meson, bound state', 'integral equations, solution', 'dimension, 2', 'infrared problem', 'Fock space', 'renormalization', 'symmetry breaking, rotational', 'coupling, dependence', 'numerical calculations']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107188']
|
['We study the meson sector of 2+1 dimensional light-front QCD using a Bloch effective Hamiltonian in the first non-trivial order. The resulting two dimensional integral equation is converted into a matrix equation and solved numerically. We investigate the efficiency of Gaussian quadrature in achieving the cancellation of linear and logarithmic light-front infrared divergences. The vanishing energy denominator problem which leads to severe infrared divergences in 2+1 dimensions is investigated in detail. Our study indicates that in the context of Fock space based effective Hamiltonian methods to tackle gauge theories in 2+1 dimensions, approaches like similarity renormalization method may be mandatory due to uncanceled infrared divergences caused by the vanishing energy denominator problem. We define and study numerically a reduced model which is relativistic, free from infrared divergences, and exhibits logarithmic confinement. The manifestation and violation of rotational symmetry as a function of the coupling are studied quantitatively.']
|
['2001-07-24']
|
136 |
['eng']
|
['Su, W C']
|
['Faddeev-Skyrme Model and Rational Maps']
|
['Particle Physics - Theory']
|
['sigma model, nonlinear', 'symmetry, O(3)', 'soliton, topological', 'transformation, rational', 'energy, lower limit', 'gauge field theory, SU(2)', 'Skyrme model']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107187']
|
['The Faddeev-Skyrme model, a modified O(3) nonlinear sigma model in three space dimensions, is known to admit topological solitons that are stabilized by the Hopf charge. The Faddeev-Skyrme model is also related to the low-energy limits of SU(2) Yang-Mills theory. Here, the model is reformulated into its gauge-equivalent expression, which turns out to be Skyrme-like. The solitonic solutions of this Skyrme-like model are analyzed by the rational map ansatz. The energy function and the Bogomolny-type lower bound of the energy are established. The generalized Faddeev-Skyrme model that originates from the infrared limits of SU(N) Yang-Mills theory is presented.']
|
['2001-07-24']
|
137 |
['eng']
|
['Moffat, J W']
|
['M-Theory and de Sitter Space']
|
['Particle Physics - Theory']
|
['M-theory', 'space-time, de Sitter', 'dimension, 11', 'field equations', 'astrophysics, model', 'supersymmetry', 'inflationary universe']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107183']
|
['An M-theory constructed in an eleven-dimensional supermanifold with a <>-product of field operators is shown to have a de Sitter space solution. Possible implications of this result for cosmology are mentioned.']
|
['2001-07-24']
|
138 |
['eng']
|
['Lavrov, P M', 'Moshin, P Y']
|
['A Superfield Formalism of osp(1,2) Covariant Quantization']
|
['Particle Physics - Theory']
|
['superfield', 'quantization', 'symmetry, OSp(1,2)', 'invariance, Becchi-Rouet-Stora']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107182']
|
['We propose a superfield description of osp(1,2) covariant quantization by extending the set of admissibility conditions for the quantum action. We realize a superfield form of the generating equations, specify the vacuum functional and obtain the corresponding transformations of extended BRST symmetry.']
|
['2001-07-24']
|
139 |
['eng']
|
['Sahakian, V V']
|
['The large M limit of Non-Commutative Open Strings at strong coupling']
|
['Particle Physics - Theory']
|
['string model, open', 'noncommutative', 'dimension, 2', 'expansion, strong coupling', 'duality, holography', 'string model, closed', 'zero mode', 'Wess-Zumino-Witten model, SL(2,R)', 'propagator', 'energy spectrum', 'field theory, classical', 'quantum mechanics, effect', 'bound state', 'scattering amplitude']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107180']
|
['Two dimensional Non-Commutative Open String (NCOS) theory, well-defined perturbatively, may also be studied at strong coupling and for large D-string charge by making use of the Holographic duality. We analyze the zero mode dynamics of a closed string in the appropriate background geometry and map the results onto a sector of strongly coupled NCOS dynamics. We find an elaborate classical picture that shares qualitative similarities with the SL(2,R) WZW model. In the quantum problem, we compute propagators and part of the energy spectrum of the theory; the latter involves interesting variations in the density of states as a function of the level number, and energies scaling inversely with the coupling. Finally, the geometry exhibits a near horizon throat, associated with NCOS dynamics, yet it is found that the whole space is available for Holography. This provides a setting to extend the Maldacena duality beyond the near horizon limit.']
|
['2001-07-24']
|
140 |
['eng']
|
['Bergman, O', 'Brodie, J', 'Okawa, Y']
|
['The Stringy Quantum Hall Fluid']
|
['Particle Physics - Theory']
|
['string model, massive', 'membrane model, D-brane', 'noncommutative', 'decoupling', 'gauge field theory', 'Chern-Simons term, noncommutative', 'Hall effect, fractional', 'fluid', 'D-particle', 'matrix model', 'quasiparticle', 'statistics, fractional', 'charge, fractional']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107178']
|
['Using branes in massive Type IIA string theory, and a novel decoupling limit, we provide an explicit correspondence between non-commutative Chern-Simons theory and the fractional quantum Hall fluid. The role of the electrons is played by D-particles, the background magnetic field corresponds to a RR 2-form flux, and the two-dimensional fluid is described by non-commutative D2-branes. The filling fraction is given by the ratio of the number of D2-branes and the number of D8-branes, and therefore by the ratio rank/level of the Chern-Simons gauge theory. Quasiparticles and quasiholes are realized as endpoints of fundamental strings on the D2-branes, and are found to possess fractional D-particle charges and fractional statistics.']
|
['2001-07-23']
|
141 |
['eng']
|
['Atiyah, Michael Francis', 'Witten, Edward']
|
['M-Theory Dynamics On A Manifold Of G_2 Holonomy']
|
['Particle Physics - Theory']
|
['M-theory', 'holonomy, G(2)', 'symmetry, SU(3)/U(1) x U(1)', 'critical phenomena', 'space-time, higher-dimensional', 'singularity', 'moduli space', 'membrane model', 'effective action', 'gauge field theory', 'dimension, 4', 'field theoretical model, CP(3)', 'fermion, anomaly', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107177']
|
['We analyze the dynamics of M-theory on a manifold of G_2 holonomy that is developing a conical singularity. The known cases involve a cone on CP^3, where we argue that the dynamics involves restoration of a global symmetry, SU(3)/U(1)^2, where we argue that there are phase transitions among three possible branches corresponding to three classical spacetimes, and S^3 x S^3 and its quotients, where we recover and extend previous results about smooth continuations between different spacetimes and relations to four-dimensional gauge theory.']
|
['2001-07-23']
|
142 |
['eng']
|
['Cordero, R', 'Vilenkin, A']
|
['Stealth Branes']
|
['Particle Physics - Theory']
|
['membrane model', 'Einstein equation', 'quantum cosmology', 'dimension, 4', 'tunneling, boundary condition', 'dimension, 5', 'astrophysics, fundamental constant', 'potential']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107175']
|
['We discuss the brane world model of Dvali, Gabadadze and Porrati in which branes evolve in an infinite bulk and the brane curvature term is added to the action. If Z_2 symmetry between the two sides of the brane is not imposed, we show that the model admits the existence of "stealth branes" which follow the standard 4D internal evolution and have no gravitational effect on the bulk space. Stealth branes can nucleate spontaneosly in a Minkowski bulk. This process is described by the standard 4D quantum cosmology formalism with tunneling boundary conditions for the brane world wave function. The notorious ambiguity in the choice of boundary conditions is fixed in this case due to the presence of the embedding spacetime.']
|
['2001-07-23']
|
143 |
['eng']
|
['Liu, H', 'Michelson, J']
|
['*-Trek III']
|
['Particle Physics - Theory']
|
['string model, closed', 'string model, open', 'correlation function', 'membrane model, D-brane', 'amplitude analysis', 'spinor, boundary condition', 'gauge field theory', 'matrix model', 'Wess-Zumino term', 'operator, vertex', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107172']
|
["We give a detailed discussion of the disk amplitudes with one closed string insertion, which we used to construct the supergravity couplings of noncommutative D-branes to the RR potentials, given in hep-th/0104139. We prove the inclusion of Elliott's formula, the integer-valued modification of the noncommutative Chern character, to all orders in the gauge field. We also give a detailed comparison between the form of the result in which Elliott's formula is manifest, and the form expressed in Matrix model variables."]
|
['2001-07-23']
|
144 |
['eng']
|
['Cvetic, M', 'Shiu, G', 'Uranga, A M']
|
['Chiral Four-Dimensional N=1 Supersymmetric Type IIA Orientifolds from Intersecting D6-Branes']
|
['Particle Physics - Theory']
|
['orientifold', 'supersymmetry, symmetry breaking', 'symmetry, Z(2) x Z(2)', 'membrane model, D-brane', 'fermion, chiral', 'family, 3', 'gauge field theory, SU(3) x SU(2) x U(1)', 'neutrino, right-handed', 'multiplet, exotic', 'M-theory', 'holonomy, G(2)', 'instanton', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107166']
|
['We construct N=1 supersymmetric four-dimensional orientifolds of type IIA on T^6/(Z_2 x Z_2) with D6-branes intersecting at angles. The use of D6-branes not fully aligned with the O6-planes in the model allows for a construction of many supersymmetric models with chiral matter, including those with the Standard Model and grand unified gauge groups. We perform a search for realistic gauge sectors, and construct the first example of a supersymmetric type II orientifold with SU(3)_C x SU(2)_L x U(1)_Y gauge group and three quark-lepton families. In addition to the supersymmetric Standard Model content, the model contains right-handed neutrinos, a (chiral but anomaly-free) set of exotic multiplets, and diverse vector-like multiplets. The general class of these constructions are related to familiar type II orientifolds by small instanton transitions, which in some cases change the number of generations, as discussed in specific models. These constructions are supersymmetric only for special choices of untwisted moduli. We briefly discuss the supersymmetry breaking effects away from that point. The M-theory lift of this general class of supersymmetric orientifold models should correspond to purely geometrical backgrounds admitting a singular G_2 holonomy metric and leading to four-dimensional M-theory vacua with chiral fermions.']
|
['2001-09-14']
|
145 |
['eng']
|
['Peeters, K', 'Zamaklar, M']
|
['Motion on moduli spaces with potentials']
|
['Particle Physics - Theory']
|
['gauge field theory, Yang-Mills', 'Higgs model', 'dimension, 5', 'soliton', 'dyon', 'moduli space', 'space-time', 'potential', 'zero mode', 'numerical calculations']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107164']
|
['In the limit of small velocities, the dynamics of half-BPS Yang-Mills-Higgs solitons can be described by the geodesic approximation. Recently, it has been shown that quarter-BPS states require the addition of a potential term to this approximation. We explain the logic behind this modification for a larger class of models and then analyse in detail the dynamics of two five-dimensional dyonic instantons, using both analytical and numerical techniques. Nonzero-modes are shown to play a crucial role in the analysis of these systems, and we explain how these modes lead to qualitatively new types of dynamics.']
|
['2001-07-20']
|
146 |
['eng']
|
['Kogan, I I', 'Reis, N B B']
|
['H-Branes and Chiral Strings']
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'string model, closed', 'string model, open', 'symmetry, chiral', 'field theory, conformal', 'space-time, signature', 'membrane model, H-brane', 'black hole, horizon', 'phase space', 'quantum mechanics, dissipation', 'boundary condition', 'geometry, noncommutative', 'squeezed state', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107163']
|
['We add a simple boundary term to the Polyakov action and construct a new class of D-branes with a single null direction. On the string world-sheet the system is described by a single quantized left-mode sector of a conformal field theory. By a Wick rotation of spacetime, we map open strings attached to these branes into chiral closed strings. We suggest that these so-called H-branes describe quantum horizons - black hole, cosmological (de-Sitter), etc. We show how one can get a space/phase space transmutation near the horizon and discuss the new features of boundary states which become squeezed states.']
|
['2001-07-20']
|
147 |
['eng']
|
['Lazaroiu, C I']
|
['String field theory and brane superpotentials']
|
['Particle Physics - Theory']
|
['field theory, string', 'field theory, topological', 'tree approximation', 'scattering amplitude', 'moduli space', 'membrane model, D-brane', 'potential', 'supersymmetry', 'Chern-Simons term']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107162']
|
["I discuss tree-level amplitudes in cubic topological string field theory, showing that a certain family of gauge conditions leads to an A-infty algebra of tree-level string products which define a potential describing the dynamics of physical states. Upon using results of modern deformation theory, I show that the string moduli space admits two equivalent descriptions, one given in standard Maurer-Cartan fashion and another given in terms of a `homotopy Maurer-Cartan problem', which describes the critical set of the potential. By applying this construction to the topological A and B models, I obtain an intrinsic formulation of `D-brane superpotentials' in terms of string field theory data. This gives a prescription for computing such quantities to all orders, and proves the equivalence of this formulation with the fundamental description in terms of string field moduli. In particular, it clarifies the relation between the Chern-Simons/holomorphic Chern-Simons actions and the superpotential for A/B-type branes."]
|
['2001-07-20']
|
148 |
['eng']
|
['Kogan, I I', 'Nichols, A']
|
['SU(2)_0 and OSp(2|2)_{-2} WZNW models']
|
['Particle Physics - Theory']
|
['field theory, conformal', 'Wess-Zumino-Witten model', 'symmetry, SU(2)', 'symmetry, OSp(2|2)', 'hidden symmetry', 'correlation function', 'central charge, -2', 'Lagrangian formalism', 'Knizhnik-Zamolodchikov equation, factorization', 'n-point function', 'boundary condition', 'Hamiltonian formalism', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107160']
|
['We show that the SU(2)_0 WZNW model has a hidden OSp(2|2)_{-2} symmetry. Both these theories are known to have logarithms in their correlation functions. We also show that, like OSp(2|2)_{-2}, the logarithmic structure present in the SU(2)_0 model is due to the underlying c=-2 sector. This leads us to conjecture that the continuous representation of SU(2) can be produced by the fusion of several discrete ones. We also discuss some of the novel boundary effects which can take place. We also show that the quantum Hamiltonian reduction of SU(2)_0 leads very directly to the correlation functions of the c=-2 model.']
|
['2001-07-20']
|
149 |
['eng']
|
['Scrucca, Claudio A', 'Serone, M']
|
['A novel class of string models with Scherk-Schwarz supersymmetry breaking']
|
['Particle Physics - Theory']
|
['string model, heterotic', 'supersymmetry, symmetry breaking', 'orbifold', 'symmetry, Z(2) x Z(2)', 'symmetry, Z(3) x Z(3)', 'tachyon', 'moduli space', 'partition function', 'stability', 'invariance, modular']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107159']
|
["A new type of four-dimensional string vacua with Scherk--Schwarz supersymmetry breaking is considered. The construction involves Z_N x Z_M' freely acting orbifolds, defined in terms of rotations and translations in the internal space. Tachyons are either absent or limited to a given region of the tree-level moduli space. Particular attention is devoted to an interesting Z_3 x Z_3' heterotic example."]
|
['2001-07-20']
|
150 |
['eng']
|
['Konechny, A', 'Turgut, O T']
|
['Supergrassmannian and large N limit of quantum field theory with bosons and fermions']
|
['Particle Physics - Theory']
|
['gauge field theory, SU(3)', 'dimension, 2', 'expansion 1/N, color', 'fermion', 'coupling, Yukawa', 'Hamiltonian formalism', 'phase space', 'algebra, Grassmann', 'meson, mass spectrum', 'operator, algebra', 'color, invariance', 'approximation, linear']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107157']
|
['We study a large $N_{c}$ limit of a two-dimensional Yang-Mills theory with bosons and fermions in the fundamental representation. We show following the approach of hep-th/9401115 that the limiting theory can be described as a classical Hamiltonian system whose phase space is an infinite-dimensional supergrassmannian. The approximate equations for mesonic spectrum are obtained. Various approximation schemes to the exact equation are discussed.']
|
['2001-07-20']
|
151 |
['eng']
|
['Park, D K', 'Kim, H', 'Miao, Y G', 'Müller-Kirsten, H J W']
|
['Randall-Sundrum Scenario at Nonzero Temperature']
|
['Particle Physics - Theory']
|
['Randall-Sundrum model', 'finite temperature', 'membrane model', 'space-time, anti-de Sitter', 'field theory, conformal', 'symmetry, Z(2)', 'dimension, 5']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107156']
|
['The effect of temperature is investigated in the Randall--Sundrum brane--world scenario. It is shown that for a spacetime ansatz motivated by similarity with AdS/CFT correspondence several features of the model, such as its $Z_2$ symmetry, are not maintained at nonzero temperatures.']
|
['2001-07-20']
|
152 |
['eng']
|
['Nishino, H', 'Rajpoot, S']
|
['Teleparallel Superspace in Eleven Dimensions Coupled to Supermembranes']
|
['Particle Physics - Theory']
|
['superspace, teleparallel', 'dimension, 11', 'supergravity', 'membrane model', 'invariance, Lorentz', 'Bianchi identity', 'kappa symmetry', 'constraint']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107155']
|
['We present a superspace formulation of N = 1 eleven-dimensional supergravity with no manifest local Lorentz covariance, which we call teleparallel superspace. This formulation will be of great importance, when we deal with other supergravity theories in dimensions higher than eleven dimensions, or a possible formulation of noncommutative supergravity. We also show the advantage of teleparallel superspace as backgrounds for supermembrane action.']
|
['2001-07-20']
|
153 |
['eng']
|
["D'Albuquerque, L C", 'Cavalcanti, R M']
|
["Comment on ``Casimir force in compact non-commutative extra dimensions and radius stabilization''"]
|
['Particle Physics - Theory']
|
['energy, Casimir', 'phi**n model, 3', 'gauge field theory, U(1)', 'Kaluza-Klein model', 'space-time, noncommutative']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107154']
|
['We call attention to a series of mistakes in a paper by S. Nam [JHEP 10 (2000) 044, hep-th/0008083].']
|
['2001-09-14']
|
154 |
['eng']
|
['Hanany, A', 'Troost, J']
|
['Orientifold planes, affine algebras and magnetic monopoles']
|
['Particle Physics - Theory']
|
['string model, background', 'orientifold', 'algebra, Kac-Moody', 'algebra, affine', 'magnetic monopole', 'boundary condition', 'gauge field theory', 'membrane model, D-brane', 'moduli space']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107153']
|
['We analyze string theory backgrounds that include different kinds of orientifold planes and map out a natural correspondence to (twisted) affine Kac-Moody algebras. The low-energy description of specific BPS states in these backgrounds leads to a construction of explicit twisted magnetic monopole solutions on R^3 x S^1. These backgrounds yield new low-energy field theories with twisted boundary conditions and the link with affine algebras yields a natural guess for the superpotentials of the corresponding pure N=1, and N=1* gauge theories.']
|
['2001-07-19']
|
155 |
['eng']
|
['Denef, F']
|
['(Dis)assembling Special Lagrangians']
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'spontaneous compactification, Calabi-Yau', 'string model', 'moduli space', 'attractor', 'field theory, deformation', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107152']
|
['We explain microscopically why split attractor flows, known to underlie certain stationary BPS solutions of four dimensional N=2 supergravity, are the relevant data to describe wrapped D-branes in Calabi-Yau compactifcations of type II string theory. We work entirely in the context of the classical geometry of A-branes, i.e. special Lagrangian submanifolds, avoiding both the use of homological algebra and explicit constructions of special Lagrangians. Our results provide a way to disassemble and assemble arbitrary special Lagrangians to and from more simple building blocks, giving a powerful and direct way to determine for example marginal stability walls and deformation moduli spaces.']
|
['2001-07-19']
|
156 |
['eng']
|
['Pouliot, P']
|
['Spectroscopy of Gauge Theories Based on Exceptional Lie Groups']
|
['Particle Physics - Theory']
|
['gauge field theory', 'group theory, E(6)', 'group theory, E(7)', 'supersymmetry', 'duality', 'group theory, SU(N)', 'group theory, representation', 'group theory, Spin(16)', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107151']
|
['We generate by computer a basis of invariants for the fundamental representations of the exceptional Lie groups E(6) and E(7), up to degree 18. We discuss the relevance of this calculation for the study of supersymmetric gauge theories, and revisit the self-dual exceptional models. We study the chiral ring of G(2) to degree 13, as well as a few classical groups. The homological dimension of a ring is a natural estimator of its complexity and provides a guideline for identifying theories that have a good chance to be amenable to a solution.']
|
['2001-07-19']
|
157 |
['eng']
|
['Mahieu, S', 'Ruelle, P']
|
['Scaling fields in the two-dimensional abelian sandpile model']
|
['Particle Physics - Theory']
|
['lattice field theory', 'model, abelian', 'dimension, 2', 'field theory, conformal', 'correlation function', 'scaling', 'dissipation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107150']
|
['We consider the isotropic two-dimensional abelian sandpile model from a perspective based on two-dimensional (conformal) field theory. We compute lattice correlation functions for various cluster variables (at and off criticality), from which we infer the field-theoretic description in the scaling limit. We find a perfect agreement with the predictions of a c=-2 conformal field theory and its massive perturbation, thereby providing direct evidence for conformal invariance and more generally for a description in terms of a local field theory. The question of the height 2 variable is also addressed, with however no definite conclusion yet.']
|
['2001-07-19']
|
158 |
['eng']
|
['Bassetto, A', 'Nardelli, G', 'Torrielli, A']
|
['Perturbative Wilson loop in two-dimensional non-commutative Yang-Mills theory']
|
['Particle Physics - Theory']
|
['gauge field theory, U(N)', 'dimension, 2', 'Wilson loop', 'light cone gauge', 'space-time, noncommutative', 'propagator, vector', 'field theory, Euclidean', 'analytic properties']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107147']
|
['We perform a perturbative ${\\cal O}(g^4)$ Wilson loop calculation for the U(N) Yang-Mills theory defined on non-commutative one space - one time dimensions. We choose the light-cone gauge and compare the results obtained when using the Wu-Mandelstam-Leibbrandt ($WML$) and the Cauchy principal value ($PV$) prescription for the vector propagator. In the $WML$ case the $\\theta$-dependent term is well-defined and regular in the limit $\\theta \\to 0$, where the commutative theory is recovered; it provides a non-trivial example of a consistent calculation when non-commutativity involves the time variable. In the $PV$ case, unexpectedly, the result differs from the $WML$ one only by the addition of two singular terms with a trivial $\\theta$-dependence. We find this feature intriguing, when remembering that, in ordinary theories on compact manifolds, the difference between the two cases can be traced back to the contribution of topological excitations.']
|
['2001-07-19']
|
159 |
['eng']
|
['Nicolai, Hermann C', 'Olive, David I']
|
['The Principal SO(1,2) Subalgebra of a Hyperbolic Kac Moody Algebra']
|
['Particle Physics - Theory']
|
['algebra, Kac-Moody', 'algebra, SO(1,2)', 'algebra, representation', 'algebra, SO(3)', 'operator, Casimir']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107146']
|
["The analog of the principal SO(3) subalgebra of a finite dimensional simple Lie algebra can be defined for any hyperbolic Kac Moody algebra g(A) associated with a symmetrizable Cartan matrix A, and coincides with the non-compact group SO(1,2). We exhibit the decomposition of g(A) into representations of SO(1,2); with the exception of the adjoint SO(1,2) algebra itself, all of these representations are unitary. We compute the Casimir eigenvalues; the associated ``exponents'' are complex and non-integer."]
|
['2001-07-19']
|
160 |
['eng']
|
['Sugino, F', 'Vanhove, P']
|
['U-duality from Matrix Membrane Partition Function']
|
['Particle Physics - Theory']
|
['membrane model', 'partition function', 'U-duality', 'supersymmetry', 'instanton', 'matrix model', 'symmetry, U(N)', 'dimension, 3', 'cohomology', 'mass, deformation', 'gauge field theory, SU(N)', 'measure']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107145']
|
['We analyse supermembrane instantons (fully wrapped supermembranes) by computing the partition function of the three-dimensional supersymmetrical U(N) matrix model under periodic boundary conditions. By mapping the model to a cohomological field theory and considering a mass-deformation of the model, we show that the partition function exactly leads to the U-duality invariant measure factor entering supermembrane instanton sums. On the other hand, a computation based on the quasi-classical assumption gives the non U-duality invariant result of the zero-mode analysis by Pioline et al. This is suggestive of the importance of supermembrane self-interactions and shows a crucial difference from the matrix string case.']
|
['2001-07-19']
|
161 |
['eng']
|
['Cvetic, M', 'Shiu, G', 'Uranga, A M']
|
['Three-Family Supersymmetric Standard-like Models from Intersecting Brane Worlds']
|
['Particle Physics - Theory']
|
['membrane model', 'string model', 'gauge field theory, SU(3) x SU(2) x U(1)', 'orientifold', 'multiplet']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107143']
|
['We construct the first three family N=1 supersymmetric string model with Standard Model gauge group SU(3)_C x SU(2)_L x U(1)_Y from an orientifold of type IIA theory on T^6/(Z_2 x Z_2) and D6-branes intersecting at angles. In addition to the minimal supersymmetric Standard Model particles, the model contains right-handed neutrinos, a chiral (but anomaly-free) set of exotic multiplets, and extra vector-like multiplets. We discuss some phenomenological features of this model.']
|
['2001-07-18']
|
162 |
['eng']
|
['Gainutdinov, R K']
|
['Ultraviolet divergences, renormalization and nonlocality of interactions in quantum field theory']
|
['Particle Physics - Theory']
|
['renormalization', 'interaction, nonlocal', 'phi**n model, 4', 'dimension, 3', 'S-matrix']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107139']
|
['We discuss the dynamical situation which arises in a local quantum field theory after renormalization. By using the example of the three-dimensional theory of a neutral scalar field interacting through the quartic coupling, we show that after renormalization the dynamics of a theory is governed by a generalized dynamical equation with a nonlocal interaction operator. It is shown that the generalized dynamical equation allows one to formulate this theory in an ultraviolet-finite way.']
|
['2001-07-18']
|
163 |
['eng']
|
['Blumenhagen, R', 'Körs, B', 'Lüst, Dieter', 'Ott, T']
|
['The Standard Model from Stable Intersecting Brane World Orbifolds']
|
['Particle Physics - Theory']
|
['membrane model', 'orbifold', 'stability', 'dilaton, tadpole', 'moduli space', 'grand unified theory, SU(5) x U(1)', 'gauge field theory, SU(3) x SU(2) x U(1) x U(1)', 'coupling, Yukawa', 'p, decay', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107138']
|
['We analyze the perturbative stability of non-supersymmetric intersecting brane world models on tori. Besides the dilaton tadpole, a dynamical instability in the complex structure moduli space occurs at string disc level, which drives the background geometry to a degenerate limit. We show that in certain orbifold models this latter instability is absent as the relevant moduli are frozen. We construct explicit examples of such orbifold intersecting brane world models and discuss the phenomenological implications of a three generation Standard Model which descends naturally from an SU(5) GUT theory. It turns out that various phenomenological issues require the string scale to be at least of the order of the GUT scale. As a major difference compared to the Standard Model, some of the Yukawa couplings are excluded so that the standard electroweak Higgs mechanism with a fundamental Higgs scalar is not realized in this set-up.']
|
['2001-07-18']
|
164 |
['eng']
|
['Li, T']
|
['GUT Breaking on $M^4 \\times T^2/(Z_2 \\times Z_2^{\\prime})$']
|
['Particle Physics - Theory']
|
['grand unified theory, SU(5)', 'dimension, 6', 'symmetry breaking', 'membrane model', 'orbifold', 'hierarchy, gauge', 'p, decay', 'zero mode', 'Kaluza-Klein model']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107136']
|
['We construct two SU(5) models on the space-time $M^4 \\times T^2/(Z_2 \\times Z_2^{\\prime})$ where the gauge and Higgs fields are in the bulk and the Standard Model fermions are on the brane at the fixed point or line. For the zero modes, the SU(5) gauge symmetry is broken down to $SU(3) \\times SU(2) \\times U(1) $ due to non-trivil orbifold projection. In particular, if we put the Standard Model fermions on the 3-brane at the fixed point in Model II, we only have the zero modes and KK modes of the Standard Model gauge fields and two Higgs doublets on the observable 3-brane. So, we can have the low energy unification, and solve the triplet-doublet splitting problem, the gauge hierarchy problem, and the proton decay problem.']
|
['2001-09-14']
|
165 |
['eng']
|
['Jentschura, U D', 'Gies, H', 'Valluri, S R', 'Lamm, D R', 'Weniger, E J']
|
['QED Effective Action Revisited']
|
['Particle Physics - Theory']
|
['quantum electrodynamics', 'effective action', 'duality, electromagnetic', 'analytic properties', 'condensation, transformation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107135']
|
['The derivation of a convergent series representation for the quantum electrodynamic effective action obtained by two of us (S.R.V. and D.R.L.) in [Can. J. Phys. vol. 71, p. 389 (1993)] is reexamined. We present more details of our original derivation. Moreover, we discuss the relation of the electric-magnetic duality to the integral representation for the effective action, and we consider the application of nonlinear convergence acceleration techniques which permit the efficient and reliable numerical evaluation of the quantum correction to the Maxwell Lagrangian.']
|
['2001-07-17']
|
166 |
['eng']
|
['Nojiri, S', 'Odintsov, S D']
|
['Quantum cosmology, inflationary brane-world creation and dS/CFT correspondence']
|
['Particle Physics - Theory']
|
['quantum cosmology', 'inflationary universe', 'membrane model', 'space-time, de Sitter', 'field theory, conformal', 'dimension, 5', 'dimension, 4', 'black hole', 'effective action', 'quantization, effect', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107134']
|
['The creation of 4d de Sitter (inflationary) boundary gluing two d5 de Sitter bulks on the classical as well as on quantum level (with account of brane QFT via corresponding trace anomaly induced effective action) is discussed. Quantum effects decrease the classical de Sitter brane radius or create new de Sitter brane with even smaller radius. It is important that brane CFT may be chosen to be dual to one of 5d de Sitter bulks, making the explicit relation of de Sitter brane-world with dS/CFT correspondence. Moving (time-dependent) de Sitter brane in d5 SdS BH is considered. In the special coordinate system where brane equations look like quantum-corrected FRW equations the comparison with similar brane equations in SAdS BH bulk is done.']
|
['2001-07-17']
|
167 |
['eng']
|
['Salcedo, L L']
|
['Generalized heat kernel coefficients']
|
['Particle Physics - Theory']
|
['heat kernel, expansion', 'effective action', 'gauge field theory', 'field theory, scalar', 'invariance, gauge']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107133']
|
['Following Osipov and Hiller, a generalized heat kernel expansion is considered for the effective action of bosonic operators. In this generalization, the standard heat kernel expansion, which counts inverse powers of a c-number mass parameter, is extended by allowing the mass to be a matrix in flavor space. We show that the generalized heat kernel coefficients can be related to the standard ones in a simple way. This holds with or without trace and integration over spacetime, to all orders and for general flavor spaces. Gauge invariance is manifest.']
|
['2001-07-17']
|
168 |
['eng']
|
['Izquierdo, J M', 'Navarro-Salas, J', 'Navarro, P']
|
['Kaluza-Klein theory, AdS/CFT correspondence and black hole entropy']
|
['Particle Physics - Theory']
|
['Kaluza-Klein model', 'space-time, anti-de Sitter', 'field theory, conformal', 'black hole, entropy', 'algebra, Virasoro']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107132']
|
['The asymptotic symmetries of the near-horizon geometry of a lifted (near-extremal) Reissner-Nordstrom black hole, obtained by inverting the Kaluza-Klein reduction, explain the deviation of the Bekenstein-Hawking entropy from extremality. We point out the fact that the extra dimension allows us to justify the use of a Virasoro mode decomposition along the time-like boundary of the near-horizon geometry, AdS$_2\\times$S$^n$, of the lower-dimensional (Reissner-Nordstrom) spacetime.']
|
['2001-07-17']
|
169 |
['eng']
|
['Son, J']
|
['String Theory on AdS_3/Z_N']
|
['Particle Physics - Theory']
|
['string model', 'space-time, anti-de Sitter', 'dimension, 3', 'orbifold', 'partition function', 'Wess-Zumino-Witten model, SL(2,R)']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107131']
|
['We study string theory on singular Z_N quotients of AdS_3, corresponding to spaces with conical defects. The spectrum is computed using the orbifold procedure. It is shown that spectral flow may be used to generate the twisted sectors. We further compute the thermal partition function and show that it correctly reproduces the spectrum.']
|
['2001-07-17']
|
170 |
['eng']
|
['Bander, M']
|
['Gravity in Dynamically Generated Dimensions']
|
['Particle Physics - Theory']
|
['gravitation, any-dimensional', 'dimension, production', 'gauge field theory, SO(1,N)']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107130']
|
['A theory of gravity in $d+1$ dimensions is dynamically generated from a theory in $d$ dimensions. As an application we show how $N$ dynamically coupled gravity theories can reduce the effective Planck mass.']
|
['2001-07-17']
|
171 |
['eng']
|
['Mitra, I', 'Roy, S']
|
['(NS5, D5, D3) bound state, OD3, OD5 limits and SL(2,Z) duality']
|
['Particle Physics - Theory']
|
['supergravity', 'membrane model', 'bound state', 'duality, SL(2,Z)', 'decoupling', 'gauge field theory, Yang-Mills', 'field theory, noncommutative', 'axion']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107127']
|
['We generalize the non-threshold bound state in type IIB supergravity of the form (NS5, D5, D3) constructed by the present authors (in hep-th/0011236) to non-zero asymptotic value of the axion $(\\chi_0$). We identify the decoupling limits corresponding to both the open D3-brane theory and open D5-brane theory for this supergravity solution as expected. However, we do not find any non-commutative Yang-Mills theory (NCYM) limit for this solution. We then study the $SL(2, Z)$ duality symmetry of type IIB theory for both OD3-limit and OD5-limit. We find that for OD3 theory, a generic $SL(2, Z)$ duality always gives another OD3-theory irrespective of the value of $\\chi_0$ being rational or not. This indicates that OD3-theory is self-dual. But, under a special set of $SL(2, Z)$ transformations OD3-theory goes over to a 5+1 dimensional NCYM theory, where these two theories are not necessarily related by strong-weak duality symmetry. On the other hand, for OD5-theory, a generic $SL(2, Z)$ duality gives another OD5-theory if $\\chi_0$ is irrational, but when $\\chi_0$ is rational it gives the little string theory limit indicating that OD5-theory is S-dual to the type IIB little string theory. However, under a special set of $SL(2, Z)$ transformations for which $\\chi_0$ is irrational OD5-theory reduces to 5+1 dimensional SYM theory.']
|
['2001-07-17']
|
172 |
['eng']
|
['Charmousis, C']
|
['Dilaton spacetimes with a Liouville potential']
|
['Particle Physics - Theory']
|
['Einstein equation, solution', 'field theory, scalar', 'any-dimensional', 'potential, Liouville', 'dilaton', 'symmetry, planar', 'singularity', 'string model', 'space-time', 'black hole', 'supersymmetry', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107126']
|
["We find and study solutions to the Einstein equations in D dimensions coupled to a scalar field source with a Liouville potential under the assumption of D-2 planar symmetry. The general static or time-dependent solutions are found yielding three classes of SO(D-2) symmetric spacetimes. In D=4 homogeneous and isotropic subsets of these solutions yield planar scalar field cosmologies. In D=5 they represent the general static or time-dependent backgrounds for a dilatonic wall-type brane Universe of planar cosmological symmetry. Here we apply these solutions as SO(8) symmetric backgrounds to non-supersymmetric 10 dimensional string theories, the open USp(32) type I string and the heterotic string SO(16)XSO(16). We obtain the general SO(9) solutions as a particular case. All static solutions are found to be singular with the singularity sometimes hidden by a horizon. The solutions are not asymptotically flat or of constant curvature. The singular behavior is no longer true once we permit space and time dependence of the spacetime metric much like thick domain wall or global vortex spacetimes. We analyze the general time and space dependent solutions giving implicitly a class of time and space dependent solutions and describe the breakdown of an extension to Birkhoff's theorem in the presence of scalar matter. We argue that the solutions described constitute the general solution to the field configuration under D-2 planar symmetry."]
|
['2001-09-14']
|
173 |
['eng']
|
['Blasone, M', 'Capolupo, A', 'Vitiello, G']
|
['Understanding flavor mixing in Quantum Field Theory']
|
['Particle Physics - Theory']
|
['talk, Zhang-Jia-Jie City 2001/05/31', 'flavor, interference', 'field theory, Dirac', 'neutrino, oscillation', 'violation, CP', 'time reversal, violation', 'flavor, 3', 'Hilbert space', 'current']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107125']
|
['We report on recent results showing that a rich non-perturbative vacuum structure is associated with flavor mixing in Quantum Field Theory. We treat explicitly the case of mixing among three generations of Dirac fermions. Exact oscillation formulas are presented exhibiting new features with respect to the usual ones. CP and T violation are also discussed.']
|
['2001-07-16']
|
174 |
['eng']
|
['Diamandis, G A', 'Georgalas, B C', 'Mavromatos, Nikolaos E', 'Papantonopoulos, E', 'Pappa, I']
|
['Cosmological Evolution in a Type-0 String Theory']
|
['Particle Physics - Theory']
|
['string model', 'membrane model', 'sigma model', 'dimension, 10', 'dimension, 4', 'inflationary universe', 'field theory, Liouville', 'field equations, solution', 'asymptotic behavior', 'effective action', 'tachyon', 'dilaton', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107124']
|
["We study the cosmological evolution of a type-0 string theory by employing non-criticality, which may be induced by fluctuations of the D3 brane worlds. We check the consistency of the approach to O(alpha ') in the corresponding sigma-model. The ten-dimensional theory is reduced to an effective four-dimensional model, with only time dependent fields. We show that the four-dimensional universe has an inflationary phase and graceful exit from it, while the other extra dimensions are stabilized to a constant value, with the fifth dimension much larger than the others. We pay particular attention to demonstrating the role of tachyonic matter in inducing these features. The Universe asymptotes, for large times, to a non-accelerating linearly-expanding Universe with a time-dependent dilaton and a relaxing to zero vacuum energy a la quintessence."]
|
['2001-07-16']
|
175 |
['eng']
|
['Cantcheff, M B']
|
['Hodge-type self(antiself)-duality for general p-form fields in arbitrary dimensions']
|
['Particle Physics - Theory']
|
['duality', 'any-dimensional', 'differential forms', 'doublet, tensor', 'electromagnetic field']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107123']
|
["It is often claimed \\cite{PST1} that the (Hodge type) duality operation is defined only in even dimensional spacetimes and that self-duality is further restricted to twice-odd dimensional spacetime theories. The purpose of this paper is to extend the notion of both duality symmetry as well as self-duality. By considering tensorial doublets, we can define a consistent notion of self-duality based on a duality Hodge-type operation in arbitrary dimension and for any rank of these tensors. Thus, a generalized Self-Dual Action is defined such that equations of motion are the claimed generalized self-duality relations. Its main relevance is that taking the proper limit on the parameters of this action provides us with a general remarkably simple definition of the so-called parent-action; which leads to duality equivalences between models physically relevant: by considering a particular limit, we find an action which describes an interesting type of relation, referred to as semi-self-duality, which results to be the parent action between Maxwell-type actions. Finally, we apply these ideas to construct manifest Hodge-type self-dual solutions in a (2+1)-dimensional version of the Maxwell's theory."]
|
['2001-07-16']
|
176 |
['eng']
|
['Henkel, M', 'Pleimling, M', 'Godrèche, C', 'Luck, J M']
|
['Aging and conformal invariance']
|
['Particle Physics - Theory']
|
['scaling', 'invariance, conformal', 'Ising model', 'dimension, 2', 'dimension, 3', 'spin, glass', 'ferromagnet']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107122']
|
['In situations such as phase ordering or non-equilibrium critical dynamics, the two-time autoresponse function scales as $R(t,s)\\approx s^{-1-a} F_2(t/s)$, where $a$ is a known exponent. For any value of the dynamical exponent $z$, we argue that this dynamical scaling can be extended towards conformal invariance. Thus the scaling function $F_2$ is determined. This prediction is confirmed by several examples, both for $T<T_c$ and at $T=T_c$: the two- and three-dimensional kinetic Ising model with Glauber dynamics is studied numerically, while exact results are available for the kinetic spherical model with a non-conserved order parameter, both for short-ranged and long-ranged interactions, as well as for the mean-field spherical spin glass.']
|
['2001-07-16']
|
177 |
['eng']
|
['Durhuus, B', 'Jónsson, T', 'Nest, R']
|
['The Existence and Stability of Noncommutative Scalar Solitons']
|
['Particle Physics - Theory']
|
['soliton, scalar', 'field theory, noncommutative', 'soliton, stability', 'functional analysis']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107121']
|
['We establish existence and stabilty results for solitons in noncommutative scalar field theories in even space dimension $2d$. In particular, for any finite rank spectral projection $P$ of the number operator ${\\mathcal N}$ of the $d$-dimensional harmonic oscillator and sufficiently large noncommutativity parameter $\\theta$ we prove the existence of a rotationally invariant soliton which depends smoothly on $\\theta$ and converges to a multiple of $P$ as $\\theta\\to\\infty$. In the two-dimensional case we prove that these solitons are stable at large $\\theta$, if $P=P_N$, where $P_N$ projects onto the space spanned by the $N+1$ lowest eigenstates of ${\\mathcal N}$, and otherwise they are unstable. We also discuss the generalisation of the stability results to higher dimensions. In particular, we prove stability of the soliton corresponding to $P=P_0$ for all $\\theta$ in its domain of existence. Finally, for arbitrary $d$ and small values of $\\theta$, we prove without assuming rotational invariance that there do not exist any solitons depending smoothly on $\\theta$.']
|
['2001-07-16']
|
178 |
['eng']
|
['Brandt, F T', 'Das, A', 'Frenkel, J']
|
['Induced parity violating thermal effective action for (2+1)-dimensional fermions interacting with a non-Abelian background']
|
['Particle Physics - Theory']
|
['fermion, massive', 'dimension, 3', 'background, nonabelian', 'parity, violation', 'effective action', 'finite temperature']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107120']
|
['We study the parity breaking effective action in 2+1 dimensions, generated, at finite temperature, by massive fermions interacting with a non-Abelian gauge background. We explicitly calculate, in the static limit, parity violating amplitudes up to the seven point function, which allows us to determine the corresponding effective actions. We derive the exact parity violating effective action when $\\vec{E}=0$. When $\\vec{E}\\neq 0$, there are families of terms that can be determined order by order in perturbation theory. We attempt to generalize our results to non-static backgrounds through the use of time ordered exponentials and prove gauge invariance, both {\\it small} and {\\it large}, of the resulting effective action. We also point out some open questions that need to be further understood.']
|
['2001-07-16']
|
179 |
['eng']
|
['Balasubramanian, V', 'Berkooz, M', 'Naqvi, A', 'Strassler, M J']
|
['Giant Gravitons in Conformal Field Theory']
|
['Particle Physics - Theory']
|
['graviton', 'field theory, conformal', 'dimension, 10', 'dimension, 11', 'duality', 'operator, chiral', 'sphere, fuzzy', 'gauge field theory, Yang-Mills', 'orbifold', 'matrix model', 'determinant', 'space-time, anti-de Sitter']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107119']
|
['Giant gravitons in AdS_5 x S^5, and its orbifolds, have a dual field theory representation as states created by chiral primary operators. We argue that these operators are not single-trace operators in the conformal field theory, but rather are determinants and subdeterminants of scalar fields; the stringy exclusion principle applies to these operators. Evidence for this identification comes from three sources: (a) topological considerations in orbifolds, (b) computation of protected correlators using free field theory and (c) a Matrix model argument. The last argument applies to AdS_7 x S^4 and the dual (2,0) theory, where we use algebraic aspects of the fuzzy 4-sphere to compute the expectation value of a giant graviton operator along the Coulomb branch of the theory.']
|
['2001-07-16']
|
180 |
['eng']
|
['Runkel, I', 'Watts, G M T']
|
['A non-rational CFT with c=1 as a limit of minimal models']
|
['Particle Physics - Theory']
|
['field theory, conformal', 'central charge, 1', 'model, minimal', 'n-point function', 'operator product expansion', 'symmetry, crossing', 'vacuum state']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107118']
|
['We investigate the limit of minimal model conformal field theories where the central charge approaches one. We conjecture that this limit is described by a non-rational CFT of central charge one. The limiting theory is different from the free boson but bears some resemblance to Liouville theory. Explicit expressions for the three point functions of bulk fields are presented, as well as a set of conformal boundary states. We provide analytic and numerical arguments in support of the claim that this data forms a consistent CFT.']
|
['2001-07-16']
|
181 |
['eng']
|
['Suyama, T']
|
['Melvin Background in Heterotic Theories']
|
['Particle Physics - Theory']
|
['string model, heterotic', 'background, Melvin', 'partition function', 'duality', 'supersymmetry', 'tachyon', 'stability', 'strong coupling']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107116']
|
['We give an interpretation of the non-supersymmetric heterotic theories as the supersymmetric heterotic theories on Melvin background with Wilson lines. The coincidence of the partition functions are shown for most of the non-supersymmetric theories. We also discuss the tachyonic instability in terms of the non-trivial background fields. The behavior in the strong coupling region is investigated by using the duality relations of the supersymmetric theories.']
|
['2001-07-16']
|
182 |
['eng']
|
['Lizzi, F', 'Szabo, R J', 'Zampini, A']
|
['Geometry of the Gauge Algebra in Noncommutative Yang-Mills Theory']
|
['Particle Physics - Theory']
|
['gauge field theory, Yang-Mills', 'field theory, noncommutative', 'algebra, Lie', 'algebra, deformation', 'diffeomorphism, symplectic', 'algebra, C*', 'density matrix', 'soliton, noncommutative']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107115']
|
['A detailed description of the infinite-dimensional Lie algebra of star-gauge transformations in noncommutative Yang-Mills theory is presented. Various descriptions of this algebra are given in terms of inner automorphisms of the underlying deformed algebra of functions on spacetime, of deformed symplectic diffeomorphisms, of the infinite unitary Lie algebra, and of the algebra of compact operators on a quantum mechanical Hilbert space. The spacetime and string interpretations are also elucidated.']
|
['2001-07-16']
|
183 |
['eng']
|
['Mironov, A E', 'Morozov, A']
|
['p,q-Duality and Hamiltonian Flows in the Space of Integrable Systems or Integrable Systems as Canonical Transforms of the Free Ones']
|
['Particle Physics - Theory']
|
['integrability', 'duality', 'transformation, conformal', 'oscillator', 'Calogero model']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107114']
|
['Variation of coupling constants of integrable system can be considered as canonical transformation or, infinitesimally, a Hamiltonian flow in the space of such systems. Any function $T(\\vec p, \\vec q)$ generates a one-parametric family of integrable systems in vicinity of a single system: this gives an idea of how many integrable systems there are in the space of coupling constants. Inverse flow is generated by a dual "Hamiltonian", $\\widetilde T(\\vec p, \\vec q)$ associated with the dual integrable system. In vicinity of a self-dual point the duality transformation just interchanges momenta and coordinates in such a "Hamiltonian": $\\widetilde T(\\vec p, \\vec q) = T(\\vec q, \\vec p)$. For integrable system with several coupling constants the corresponding "Hamiltonians" $T_i(\\vec p, \\vec q)$ satisfy Whitham equations and after quantization (of the original system) become operators satisfying the zero-curvature condition in the space of coupling constants: [ d/dg_a - T_a(p,q), d/dg_b - T_b(p,q) ] = 0. Some explicit formulas are given for harmonic oscillator and for Calogero-Ruijsenaars-Dell system.']
|
['2001-09-14']
|
184 |
['eng']
|
['Lunin, O', 'Mathur, S D']
|
["The slowly rotating near extremal D1-D5 system as a `hot tube'"]
|
['Particle Physics - Theory']
|
['membrane model, D-brane', 'angular momentum', 'field theory, scalar', 'soliton', 'boundary condition', 'field theory, conformal']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107113']
|
["The geometry of the D1-D5 system with a small angular momentum j has a long throat ending in a conical defect. We solve the scalar wave equation for low energy quanta in this geometry. The quantum is found to reflect off the end of the throat, and stay trapped in the throat for a long time. The length of the throat for j=1/2 equals n_1n_5 R, the length of the effective string in the CFT; we also find that at this distance the incident wave becomes nonlinear. Filling the throat with several quanta gives a `hot tube' which has emission properties similar to those of the near extremal black hole."]
|
['2001-07-13']
|
185 |
['eng']
|
['Arcioni, G', 'Carfora, M', 'Marzuoli, A', "O'Loughlin, M H"]
|
['Implementing holographic projections in Ponzano--Regge gravity']
|
['Particle Physics - Theory']
|
['quantum gravity', 'holography', 'lattice field theory', 'partition function', 'approximation, quasiclassical', 'decoupling', 'Clebsch-Gordan coefficients']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107112']
|
['We consider the path-sum of Ponzano-Regge with additional boundary contributions in the context of the holographic principle of Quantum Gravity. We calculate an holographic projection in which the bulk partition function goes to a semi-classical limit while the boundary state functional remains quantum-mechanical. The properties of the resulting boundary theory are discussed.']
|
['2001-07-13']
|
186 |
['eng']
|
['Narayan, K S', 'Rangamani, M']
|
['Hot Little String Correlators']
|
['Particle Physics - Theory']
|
['membrane model', 'supergravity', 'string model', 'scalar particle, massless', 'two-point function', 'dilaton, background', 'holography', 'temperature, Hagedorn']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107111']
|
['We study the propagation of a massless minimally coupled scalar in the near horizon geometry of non-extremal NS5-branes. Using the holographic principle for dilatonic backgrounds we compute the two-point function of an operator in Little String Theory at the Hagedorn temperature. We then comment on relations with correlation functions in two dimensional string theory.']
|
['2001-07-13']
|
187 |
['eng']
|
['Barcelos-Neto, J', 'Marino, E C']
|
['A new sequence for topological terms at any spacetime dimensions']
|
['Particle Physics - Theory']
|
['Chern-Simons term', 'gauge field theory', 'dimensional reduction', 'mass generation, topological', 'transmutation, statistical']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107109']
|
['We investigate a sequence of quadratic topological terms of the Chern-Simons type in different spacetime dimensions, related by dimensional compactification and sharing the properties of topological mass generation and statistical transmutation.']
|
['2001-07-13']
|
188 |
['eng']
|
['Kiem, Y H', 'Rey, S J', 'Sato, H T', 'Yee, J T']
|
['Anatomy of One-Loop Effective Action in Noncommutative Scalar Field Theories']
|
['Particle Physics - Theory']
|
['field theory, noncommutative', 'phi**n model, 3', 'effective action', 'Feynman graph, higher-order', 'Wilson loop', 'propagator']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107106']
|
['One-loop effective action of noncommutative scalar field theory with cubic self-interaction is studied. Utilizing worldline formulation, both planar and nonplanar part of the effective action are computed explicitly. We find complete agreement of the result with Seiberg-Witten limit of string worldsheet computation and standard Feynman diagrammatics. We prove that, at low-energy and large noncommutativity limit, nonplanar part of the effective action is simplified enormously and is resummable into a quadratic action of scalar open Wilson line operators.']
|
['2001-07-13']
|
189 |
['eng']
|
['Chan, C T', 'Lee, J C']
|
['Noncommutative Solitons and the W_{1+\\infty} Algebras in Quantum Hall Theory']
|
['Particle Physics - Theory']
|
['field theory, noncommutative', 'symmetry, U(infinity)', 'algebra, W(infinity)', 'soliton, noncommutative', 'Hall effect', 'space, Moyal']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107105']
|
['We show that U(\\infty) symmetry transformations of the noncommutative field theory in the Moyal space are generated by a combination of two W_{1+\\infty} algebras in the Landau problem. Geometrical meaning of this infinite symmetry is illustrated by examining the transformations of an invariant subgroup on the noncommutative solitons, which generate deformations and boosts of solitons.']
|
['2001-07-13']
|
190 |
['eng']
|
['Lahiri, A']
|
['Gauge transformations of the non-Abelian two-form']
|
['Particle Physics - Theory']
|
['transformation, gauge', 'differential forms', 'gauge field theory, SU(N)']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107104']
|
['A novel inhomogeneous gauge transformation law is proposed for a non-Abelian adjoint two-form in four dimensions. Rules for constructing actions invariant under this are given. The auxiliary vector field which appears in some of these models transforms like a second connection in the theory. Another local symmetry leaves the compensated three-form field strength invariant, but does not seem to be generated by any combination of local constraints. Both types of symmetries change the action by total divergences, suggesting that boundary degrees of freedom have to be taken into account for local quantization.']
|
['2001-07-13']
|
191 |
['eng']
|
['Hayakawa, M', 'Ishibashi, N']
|
['Perturbative world-volume dynamics of the bosonic membrane and string']
|
['Particle Physics - Theory']
|
['boson, membrane model', 'perturbation theory', 'space-time, dimension', 'field theory, action', 'symmetry, Becchi-Rouet-Stora', 'background field', 'string model', 'gauge, conformal', 'dimensional reduction', 'anomaly']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107103']
|
['We study the world-volume theory of a bosonic membrane perturbatively and discuss if one can obtain any conditions on the number of space-time dimensions from the consistency of the theory. We construct an action which is suitable for such a study. In order to study the theory perturbatively we should specify a classical background around which perturbative expansion is defined. We will discuss the conditions which such a background should satisfy to deduce the critical dimension. Unfortunately we do not know any background satisfying such conditions. In order to get indirect evidences for the critical dimension of the membrane, we next consider two string models obtained via double dimensional reduction of the membrane. The first one reduces to the Polyakov string theory in the conformal gauge. The second one is described by the Schild action. We show that the critical dimension is 26 for these string theories, which implies that the critical dimension is 27 for the membrane theory.']
|
['2001-07-13']
|
192 |
['eng']
|
['Buchel, A S']
|
['On the thermodynamic instability of LST']
|
['Particle Physics - Theory']
|
['string model', 'stability, thermodynamical', 'duality', 'holography', 'supergravity', 'membrane model', 'conifold', 'black hole', 'space-time, deformation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107102']
|
['The high energy thermodynamics of Little String Theory (LST) is known to be unstable. An unresolved question is whether the corresponding instability in LST holographic dual is of stringy or supergravity origin. We study UV thermodynamics of a large metric deformation of the LST dual realized (in the extremal case) by type IIB fivebranes wrapping a two-sphere of a resolved conifold, and demonstrate that the resulting black hole has negative specific heat. This explicitly shows that the high energy thermodynamic instability of the LST holographic dual is of the supergravity origin.']
|
['2001-07-13']
|
193 |
['eng']
|
['Furuuchi, K', 'Okuyama, K']
|
['Comma Vertex and String Field Algebra']
|
['Particle Physics - Theory']
|
['field theory, string', 'vertex function', 'algebra', 'oscillator']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107101']
|
["We study the matter part of the algebra of open string fields using the 3-string vertex over the sliver state, which we call ``comma vertex''. By generalizing this comma vertex to the $N$-string overlap, we obtain a closed form of the Neumann coefficients in the $N$-string vertex and discuss its relation to the oscillator representation of wedge states."]
|
['2001-07-13']
|
194 |
['eng']
|
['Higashijima, K', 'Kimura, T', 'Nitta, M']
|
['A Note on Conifolds']
|
['Particle Physics - Theory']
|
['conifold, singularity', 'potential, Kaehler', 'sigma model, nonlinear', 'superfield, chiral', 'symmetry, O(N)']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107100']
|
['We present the Ricci-flat metric and its Kahler potential on the conifold with the O(N) isometry, whose conical singularity is repaired by the complex quadric surface Q^{N-2} = SO(N)/SO(N-2)xU(1).']
|
['2001-07-13']
|
195 |
['eng']
|
['Balachandran, A P', 'Dolan, B P', 'Lee, J', 'Martin, X', "O'Connor, D"]
|
['Fuzzy Complex Projective Spaces and their Star-products']
|
['Particle Physics - Theory']
|
['space, fuzzy', 'algebra, noncommutative', 'space, CP(N-1)', 'group theory, representation', 'mathematical methods']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107099']
|
['We derive an explicit expression for an associative *-product on the fuzzy complex projective space, $CP^{N-1}_F$. This generalises previous results for the fuzzy 2-sphere and gives a discrete non-commutative algebra of functions on $CP^{N-1}_F$, represented by matrix multiplication. The matrices are restricted to ones whose dimension is that of the totally symmetric representations of SU(N). In the limit of infinite dimensional matrices we recover the commutative algebra of functions on $CP^{N-1}$. Derivatives on $CP^{N-1}_F$ are also expressed as matrix commutators.']
|
['2001-07-13']
|
196 |
['eng']
|
['Viswanathan, K S', 'Yang, Y']
|
['Unorientable Boundary Superstring Field theory with Tachyon field']
|
['Particle Physics - Theory']
|
['field theory, string', 'supersymmetry', 'tachyon', 'partition function']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107098']
|
['We use the BSFT method to study the unoriented open string theory. The partition function on the Mobius strip is calculated. We find that, at the one-loop level, the divergence coming from planar graph and unoriented graph cancel each other as expected.']
|
['2001-07-13']
|
197 |
['eng']
|
['Ferrari, F']
|
['Exact amplitudes in four dimensional non-critical string theories']
|
['Particle Physics - Theory']
|
['string model', 'gauge field theory, SU(N)', 'supersymmetry', 'expansion 1/N', 'moduli space, singularity', 'amplitude analysis', 'matrix model', 'central charge, 1', 'scaling', 'critical phenomena', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107096']
|
['The large Nc expansion of N=2 supersymmetric Yang-Mills theory with gauge group SU(Nc) has recently been shown to break down at singularities on the moduli space. We conjecture that by taking Nc to infinity and approaching the singularities in a correlated way, all the observables of the theory have a finite universal limit yielding amplitudes in string theories dual to field theories describing the light degrees of freedom. We explicitly calculate the amplitudes corresponding to the Seiberg-Witten period integrals for an A_{n-1} series of multicritical points as well as for other critical points exhibiting a scaling reminiscent of the c=1 matrix model. Our results extend the matrix model approach to non-critical strings in less than one dimension to non-critical strings in four dimensions.']
|
['2001-07-12']
|
198 |
['eng']
|
['Siegel, Warren']
|
['Introduction to string field theory']
|
['Particle Physics - Theory']
|
['book', 'field theory, string', 'light cone', 'invariance, Becchi-Rouet-Stora', 'gauge field theory', 'mechanics, classical', 'quantum mechanics', 'operator, algebra', 'string model', 'bibliography']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107094']
|
['The 1988 book, now free, with corrections and bookmarks (for pdf).']
|
['2001-07-12']
|
199 |
['eng']
|
['Ellwanger, Ulrich', 'Wschebor, N']
|
['Solvable Confining Gauge Theories at Large N']
|
['Particle Physics - Theory']
|
['gauge field theory, U(1)', 'critical phenomena, confinement', 'expansion 1/N', 'invariance, gauge', 'duality, transformation', 'magnetic monopole, condensation']
|
['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=0107093']
|
['In this letter we consider models with N U(1) gauge fields together with N Kalb-Ramond fields in the large N limit. These models can be solved explicitely and exhibit confinement for a large class of bare actions. The confining phase is characterized by an approximate "low energy" vector gauge symmetry under which the Kalb-Ramond fields transform. A duality transformation shows that confinement is associated with magnetic monopoles condensation.']
|
['2001-07-12']
|
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