Results 11  20
of
121
Exact black string solutions in three dimensions, Nucl. Phys. B368
, 1992
"... ABSTRACT: A family of exact conformal field theories is constructed which describe charged black strings in three dimensions. Unlike previous charged black hole or extended black hole solutions in string theory, the low energy spacetime metric has a regular inner horizon (in addition to the event ho ..."
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ABSTRACT: A family of exact conformal field theories is constructed which describe charged black strings in three dimensions. Unlike previous charged black hole or extended black hole solutions in string theory, the low energy spacetime metric has a regular inner horizon (in addition to the event horizon) and a timelike singularity. As the charge to mass ratio approaches unity, the event horizon remains but the singularity disappears
Thermodynamics of twodimensional black holes,” Mod
 Phys. Lett. A
, 1992
"... We explore the thermodynamics of a general class of two dimensional dilatonic blackholes. A simple prescription is given that allows us to compute the mass, entropy and thermodynamic potentials, with results in agreement with those obtained by other methods, when The original paper [1] on two dimen ..."
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Cited by 16 (0 self)
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We explore the thermodynamics of a general class of two dimensional dilatonic blackholes. A simple prescription is given that allows us to compute the mass, entropy and thermodynamic potentials, with results in agreement with those obtained by other methods, when The original paper [1] on two dimensional blackholes in string theory started a renewed interest in the longstanding problem of formulating a non trivial theory of two dimensional gravity. Progress has been made in finding solutions of WZW models, which are exactly conformal field theories, as well as in finding solutions of the low energy string
On Algebraic Singularities, Finite Graphs and DBrane Gauge Theories: A String Theoretic Perspective
, 2002
"... In this writing we shall address certain beautiful interrelations between the construction of 4dimensional supersymmetric gauge theories and resolution of algebraic singularities, from the perspective of String Theory. We review in some detail the requisite background in both the mathematics, such ..."
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Cited by 11 (8 self)
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In this writing we shall address certain beautiful interrelations between the construction of 4dimensional supersymmetric gauge theories and resolution of algebraic singularities, from the perspective of String Theory. We review in some detail the requisite background in both the mathematics, such as orbifolds, symplectic quotients and quiver representations, as well as the physics, such as gauged linear sigma models, geometrical engineering, HananyWitten setups and Dbrane probes. We investigate aspects of worldvolume gauge dynamics using Dbrane resolutions of various CalabiYau singularities, notably Gorenstein quotients and toric singularities. Attention will be paid to the general methodology of constructing gauge theories for these singular backgrounds, with and without the presence of the NSNS Bfield, as well as the Tduals to brane setups and branes wrapping cycles in the mirror geometry. Applications of such diverse and elegant mathematics as crepant resolution of algebraic singularities, representation of finite groups and finite graphs, modular invariants of affine Lie algebras, etc. will naturally arise. Various viewpoints and generalisations of McKay’s Correspondence will also be considered. The present work is a transcription of excerpts from the first three volumes of the author’s PhD thesis which was written under the direction of Prof. A. Hanany to whom he is much indebted at the Centre for Theoretical Physics of MIT, and which, at the suggestion of friends, he posts to the ArXiv pro hac vice; it is his sincerest wish that the ensuing pages might be of some small use to the beginning student.
Duality in gauged WZW models
 Mod. Phys. Lett
, 1991
"... All anomaly free subgroups of the internal symmetries of a WZW model are classified. It is shown that the gauging of an axial or vector U(1) subgroup provides Conformal Field Theories with target manifolds that are dual. Some implications are discussed ..."
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All anomaly free subgroups of the internal symmetries of a WZW model are classified. It is shown that the gauging of an axial or vector U(1) subgroup provides Conformal Field Theories with target manifolds that are dual. Some implications are discussed
M(atrix) theory in various dimensions
"... We demonstrate the precise numerical correspondence between long range scattering of supergravitons and membranes in supergravity in the infinite momentum frame and in M(atrix)Theory, both in 11 dimensions and for toroidal compactifications. We also identify wrapped membranes in terms of topologica ..."
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We demonstrate the precise numerical correspondence between long range scattering of supergravitons and membranes in supergravity in the infinite momentum frame and in M(atrix)Theory, both in 11 dimensions and for toroidal compactifications. We also identify wrapped membranes in terms of topological invariants of the vector bundles associated to the field theory description of compactified M(atrix)Theory. We use these results to check the realization of Tduality in M(atrix)Theory. In the past few months, a great deal of evidence has been accumulated in favor of the matrix model description of MTheory proposed by Banks, Fischler, Shenker, and Susskind [1]. This M(atrix)Theory, as it has come to be known, is the large N limit of the maximally supersymmetric quantum mechanics of U(N) matrices. According to this picture, D0branes
A Study of Brane Solutions in Ddimensional Coupled Gravity System
, 2008
"... In this paper, we use only the equation of motion for an interacting system of gravity, dilaton and antisymmetric tensor to study the soliton solutions by making use of a Poincaré invariant ansatz. We show that the system of equations are completly integrable and the solution is unique with appropri ..."
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In this paper, we use only the equation of motion for an interacting system of gravity, dilaton and antisymmetric tensor to study the soliton solutions by making use of a Poincaré invariant ansatz. We show that the system of equations are completly integrable and the solution is unique with appropriate boundary conditions. Some new class of solutions are also given explicitly. 1
Unification of M and FTheory CalabiYau FourFold Vacua
, 1996
"... We consider splitting type phase transitions between CalabiYau fourfolds. These transitions generalize previously known types of conifold transitions between threefolds. Similar to conifold configurations the singular varieties mediating the transitions between fourfolds connect moduli spaces of di ..."
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We consider splitting type phase transitions between CalabiYau fourfolds. These transitions generalize previously known types of conifold transitions between threefolds. Similar to conifold configurations the singular varieties mediating the transitions between fourfolds connect moduli spaces of different dimensions, describing ground states in M and Ftheory with different numbers of massless modes as well as different numbers of cycles to wrap various pbranes around. The web of CalabiYau fourfolds obtained in this way contains the class of all complete intersection manifolds embedded in products of ordinary projective spaces, but extends also to weighted configurations. It follows from this that for some of the fourfold transitions vacua with vanishing superpotential are connected to ground states with nonzero superpotential.
Duality in matrix theory and threedimensional mirror symmetry,” hepth/9707019
"... Certain limits of the duality between Mtheory on T 5 /Z2 and IIB on K3 are analyzed in Matrix theory. The correspondence between Mtheory fivebranes and ALE backgrounds is realized as three dimensional mirror symmetry. Noncritical strings dual to open membranes are explicitly described as gauge t ..."
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Certain limits of the duality between Mtheory on T 5 /Z2 and IIB on K3 are analyzed in Matrix theory. The correspondence between Mtheory fivebranes and ALE backgrounds is realized as three dimensional mirror symmetry. Noncritical strings dual to open membranes are explicitly described as gauge theory excitations. We also comment on Type IIA on K3 and the appearance of gauge symmetry enhancement at special points in the moduli space. July
Axions as Dark Matter Particles
, 904
"... Abstract. We review the current status of axions as dark matter. Motivation, models, constraints and experimental searches are outlined. The axion remains an excellent candidate for the dark matter and future experiments, particularly the Axion Dark Matter eXperiment (ADMX), will cover a large fract ..."
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Abstract. We review the current status of axions as dark matter. Motivation, models, constraints and experimental searches are outlined. The axion remains an excellent candidate for the dark matter and future experiments, particularly the Axion Dark Matter eXperiment (ADMX), will cover a large fraction of the axion parameter space. Axions as Dark Matter Particles 2 1.
Unstable NonBPS DBranes of TypeII String Theories in LightCone GreenSchwarz Formalism
, 2000
"... The problem of describing the boundary states of unstable nonBPS Dbranes of typeII string theories in lightcone GreenSchwarz (GS) formalism is addressed. Regarding the type II theories in lightcone gauge as different realizations of the ˆ SO(8)k=1 KacMoody algebra, the nonBPS Dbrane boundar ..."
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Cited by 4 (4 self)
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The problem of describing the boundary states of unstable nonBPS Dbranes of typeII string theories in lightcone GreenSchwarz (GS) formalism is addressed. Regarding the type II theories in lightcone gauge as different realizations of the ˆ SO(8)k=1 KacMoody algebra, the nonBPS Dbrane boundary states of these theories are given in terms of the relevant Ishibashi states constructed in this current algebra. Using the expressions for the current modes in terms of the GS variables it is straightforward to reexress the boundary states in the GS formalism. The problem that remains is the lack of manifest SO(8) covariance in these expressions. We also derive the various known expressions for the BPS and nonBPS Dbrane boundary states by starting with the current algebra Ishibashi states.