Results 1  10
of
33
Micromanaging de Sitter holography
, 2010
"... We develop tools to engineer de Sitter vacua with semiholographic duals, using elliptic fibrations and orientifolds to uplift FreundRubin compactifications with CFT duals. The dual brane construction is compact and constitutes a microscopic realization of the dS/dS correspondence, realizing ddime ..."
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We develop tools to engineer de Sitter vacua with semiholographic duals, using elliptic fibrations and orientifolds to uplift FreundRubin compactifications with CFT duals. The dual brane construction is compact and constitutes a microscopic realization of the dS/dS correspondence, realizing ddimensional de Sitter space as a warped compactification down to (d − 1)dimensional de Sitter gravity coupled to a pair of largeN matter sectors. This provides a parametric microscopic interpretation of the GibbonsHawking entropy. We illustrate these ideas with an explicit class of
Cosmological creation of Dbranes and antiDbranes”, JHEP 03 (2002) 056
 in brane inflation”, Phys. Lett. B 563 (2003) 614, [arXiV:hepth/0303269]. E.J. Copeland, R.C. Myers and J.Polchinski, “Cosmic F and Dstrings”, JHEP 06
, 2004
"... Abstract: We argue that the early universe may be described by an initial state of spacefilling branes and antibranes. At high temperature this system is stable. At low temperature tachyons appear and lead to a phase transition, dynamics, and the creation of Dbranes. These branes are cosmological ..."
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Cited by 19 (1 self)
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Abstract: We argue that the early universe may be described by an initial state of spacefilling branes and antibranes. At high temperature this system is stable. At low temperature tachyons appear and lead to a phase transition, dynamics, and the creation of Dbranes. These branes are cosmologically produced in a generic fashion by the Kibble mechanism. From an entropic point of view, the formation of lower dimensional branes is preferred and D3 braneworlds are exponentially more likely to form than higher dimensional branes. Virtually any brane configuration can be created from such phase transitions by adjusting the tachyon profile. A lower bound on the
Contents
"... II. Theory 30 A. Anisotropic molecular reorientation in an ordering potential 32 B. Restricted rotation in a cone model.. 33 ..."
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Cited by 6 (0 self)
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II. Theory 30 A. Anisotropic molecular reorientation in an ordering potential 32 B. Restricted rotation in a cone model.. 33
Stretched horizons, quasiparticles and quasinormal modes,” Phys
 Rev. D
"... We propose that stretched horizons can be described in terms of a gas of noninteracting quasiparticles. The quasiparticles are unstable, with a lifetime set by the imaginary part of the lowest quasinormal mode frequency. If the horizon arises from an AdS/CFT style duality the quasiparticles are also ..."
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We propose that stretched horizons can be described in terms of a gas of noninteracting quasiparticles. The quasiparticles are unstable, with a lifetime set by the imaginary part of the lowest quasinormal mode frequency. If the horizon arises from an AdS/CFT style duality the quasiparticles are also the effective lowenergy degrees of freedom of the finitetemperature CFT. We analyze a large class of models including Schwarzschild black holes, nonextremal Dpbranes, the rotating BTZ black hole and de Sitter space, and we comment on degenerate horizons. The quasiparticle description makes The physics of black holes has attracted wide attention as an arena for testing theories of quantum gravity. In particular a great deal of effort has gone towards resolving the puzzles of black hole thermodynamics and information loss. In this context the idea of a stretched horizon arose as a useful tool for
Open string tachyon in supergravity solution
"... We study the tachyon condensation of the D ¯ Dbrane system with a constant tachyon vev in the context of classical solutions of the Type II supergravity. We find that the general solution with the symmetry SO(1,p) × SO(9 − p) (the threeparameter solution) includes the extremal black pbrane solu ..."
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We study the tachyon condensation of the D ¯ Dbrane system with a constant tachyon vev in the context of classical solutions of the Type II supergravity. We find that the general solution with the symmetry SO(1,p) × SO(9 − p) (the threeparameter solution) includes the extremal black pbrane solution as an appropriate limit of the solution with fixing one of the three parameters (c1). We investigate the behavior of the solution around the extremal limit and identify the trajectory corresponding to the tachyon condensation of the D ¯ Dbrane system in the parameter space of solution by comparing the behavior of the solution with that predicted by the boundary state. We find that we must fix c1 to zero and the only two parameters are needed to express the decay of the D ¯ Dbrane system. This means that the parameter c1 does not correspond to the tachyon vev of the D ¯ Dbrane system. 1
Transverselyintersecting Dbranes at finite temperature and chiral phase transition
 JHEP 0905
"... We consider SakaiSugimoto like models consisting of DqDpDpbranes where Nf flavor Dp and Dpbranes transversely intersect Nc color Dqbranes along two (r + 1)dimensional subspaces for Nf ≪ Nc. For some values of p and q, the theory of intersections dynamically breaks nonAbelian chiral symmetry ..."
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We consider SakaiSugimoto like models consisting of DqDpDpbranes where Nf flavor Dp and Dpbranes transversely intersect Nc color Dqbranes along two (r + 1)dimensional subspaces for Nf ≪ Nc. For some values of p and q, the theory of intersections dynamically breaks nonAbelian chiral symmetry which is holographically realized as a smooth connection of the flavor branes at some point in the bulk of the geometry created by Nc Dqbranes. We analyze the system at finite temperature and map out different phases of the theory representing chiral symmetry breaking and restoration. We find that, unlike the zerotemperature case, there exist generically two branches of smoothlyconnected solutions for the flavor branes, one getting very close to the horizon of the background and the other staying farther away from it. At low temperatures, the solution which stays farther away from the horizon generically determines the vacuum. Also, we find some surprises in the case of the background D5branes. We conclude with some comments on how chiral phase transition in transverselyintersecting Dbranes can be seen from the dynamics of an open string tachyon in a thermal background. 1 Introduction, summary and conclusions A very interesting holographic model of QCD which realizes dynamical breaking of nonAbelian
Threebrane Absorption and Emission from a BraneAntibrane System
, 2004
"... We show that a previously proposed model based on a D3brane–antiD3brane system at finite temperature can reproduce the lowfrequency absorption and emission probabilities of the black threebrane of Type IIB supergravity arbitrarily far from extremality, for arbitrary partial waves of a minimal sca ..."
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We show that a previously proposed model based on a D3brane–antiD3brane system at finite temperature can reproduce the lowfrequency absorption and emission probabilities of the black threebrane of Type IIB supergravity arbitrarily far from extremality, for arbitrary partial waves of a minimal scalar field. Our calculations cover in particular the case of the neutral threebrane, which corresponds to the Schwarzschild black hole in seven dimensions. Our results provide not only significant evidence in favor of the braneantibrane model, but also a rationale for the condition that the energies of the two component gases agree with one another. In the course of our analysis we correct previous results on the absorption probabilities of the nearextremal threebrane, and extend them to the farfromextremal regime. 1
A tutorial on links between cosmic string theory and superstring theory
"... Cosmic superstrings are introduced to nonexperts. First Dbranes and (p,q) strings are discussed. Then we explain how tachyon condensation in the early universe may have produced F, D and (p,q) strings. Warped geometries which can render horizon sized superstrings relatively light are discussed. Va ..."
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Cosmic superstrings are introduced to nonexperts. First Dbranes and (p,q) strings are discussed. Then we explain how tachyon condensation in the early universe may have produced F, D and (p,q) strings. Warped geometries which can render horizon sized superstrings relatively light are discussed. Various warped geometries including the deformed conifold in the KlebanovStrassler geometry are reviewed and their warp factors are calculated. The decay rates for strings in the KS geometry are calculated and reasons for the necessity of orientifolds are reviewed. We then outline calculations of the intercommuting probability of F, D and (p,q) strings and explain in detail why cosmic superstring intercommuting probabilities can be small. We explore cosmic superstring networks. Their scaling properties are examined using the Velocity One Scale model and its extra dimensional extensions. Two different approaches and two sets of simulations are reviewed. Finally, we review in detail the gravitational wave amplitude calculations for strings with intercommuting probability
Schwarzschild Black Holes from BraneAntibrane Pairs
, 2002
"... We show that D=4 Schwarzschild black holes can arise from a doublet of Euclidean D3D3 pairs embedded in D=10 Lorentzian spacetime. By starting from a D=10 type IIB supergravity description for the D3 − D3 pairs and wrapping one of them over an external 2sphere, we derive all vacuum solutions compa ..."
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We show that D=4 Schwarzschild black holes can arise from a doublet of Euclidean D3D3 pairs embedded in D=10 Lorentzian spacetime. By starting from a D=10 type IIB supergravity description for the D3 − D3 pairs and wrapping one of them over an external 2sphere, we derive all vacuum solutions compatible with the symmetry of the problem. Analysing under what condition a Euclidean brane configuration embedded in a Lorentzian spacetime can lead to a timeindependent spacetime, enables us to single out the embedded D=4 Schwarzschild spacetime as the unique solution generated by the D3D3 pairs. In particular we argue on account of energyconservation that timeindependent solutions arising from isolated Euclidean branes require those branes to sit at event horizons. In combination with previous work this selfdual braneantibrane origin of the black hole allows for a microscopic counting of its BekensteinHawking entropy. Finally we indicate how Hawkingradiation can be understood from the associated tachyon condensation process. 1
hepth/yymmddd Relating Schwarzschild Black Holes to BranesAntibranes
, 2006
"... We construct in the supergravity framework a relation between thermal chargeless nonextremal black threebranes and thermal Dirichlet branesantibranes systems. We propose this relation as a possible explanation for the intriguing similarity between the black branes BekensteinHawking entropy and th ..."
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We construct in the supergravity framework a relation between thermal chargeless nonextremal black threebranes and thermal Dirichlet branesantibranes systems. We propose this relation as a possible explanation for the intriguing similarity between the black branes BekensteinHawking entropy and the field theory entropy of thermal branesantibranes. We comment on various relations between branes, antibranes and nonBPS branes in type II string theories.