Results 11  20
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508
Glueball mass spectra and other issues for supergravity duals of QCD models
 JHEP
"... We derive WKB expressions for glueball masses of various finite temperature supergravity models. The results are very close to recent numerical computations. We argue that the spectra has some universality that depends only on the dimension of the AdS space and the singularity structure of the horiz ..."
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Cited by 79 (2 self)
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We derive WKB expressions for glueball masses of various finite temperature supergravity models. The results are very close to recent numerical computations. We argue that the spectra has some universality that depends only on the dimension of the AdS space and the singularity structure of the horizon. This explains the stability of the 0 ++ glueball mass ratios between various models. We also consider the recently proposed nonsupersymmetric model arising from the type 0 string. In the supergravity limit of this model, the heavy quark potential has an effective coupling with 1/(log u) behavior in the UV. Unfortunately, the supergravity solution implies that the heavy quark potential is still coulombic in the infrared, with an effective coupling of order 1. We also argue that the type 0 supergravity background solution does not have normalizable glueball solutions. November
The hexagon Wilson loop and the BDS ansatz for the sixgluon amplitude, Phys
 Lett. B
"... As a test of the gluon scattering amplitude/Wilson loop duality, we evaluate the hexagonal lightlike Wilson loop at two loops in N = 4 super YangMills theory. We compare its finite part to the BernDixonSmirnov (BDS) conjecture for the finite part of the sixgluon amplitude. We find that the two e ..."
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Cited by 75 (12 self)
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As a test of the gluon scattering amplitude/Wilson loop duality, we evaluate the hexagonal lightlike Wilson loop at two loops in N = 4 super YangMills theory. We compare its finite part to the BernDixonSmirnov (BDS) conjecture for the finite part of the sixgluon amplitude. We find that the two expressions have the same behavior in the collinear limit, but they differ by a nontrivial function of the three (dual) conformally invariant variables. This implies that either the BDS conjecture or the gluon amplitude/Wilson loop duality fails for the sixgluon amplitude, starting from two loops. Our results are in qualitative agreement with the analysis of Alday and Maldacena of scattering amplitudes with infinitely many external gluons. 1 UMR 5108 associée à l’Université de Savoie
Nonsupersymmetric conformal field theories from stable antide Sitter spaces,” hepth/9810206
"... We describe new nonsupersymmetric conformal field theories in three and four dimensions, using the CFT/AdS correspondence. In order to believe in their existence at large Nc and strong ’t Hooft coupling, we explicitly check the stability of the corresponding nonsupersymmetric antide Sitter backgro ..."
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Cited by 74 (2 self)
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We describe new nonsupersymmetric conformal field theories in three and four dimensions, using the CFT/AdS correspondence. In order to believe in their existence at large Nc and strong ’t Hooft coupling, we explicitly check the stability of the corresponding nonsupersymmetric antide Sitter backgrounds. Cases of particular interest are the relevant deformations of the N = 4 SCFT in SU(3) and SO(5) invariant directions. It turns out that the former is a stable, and the latter an unstable nonsupersymmetric type IIB background. Two dimensional conformal field theories exhibit a very rich structure, and much can be said about their properties. One of the most striking features is the ability to control, not just the conformal theory itself, but also the nearby nonconformal theories obtained by adding certain speciallychosen relevant perturbations. These nonconformal theories exhibit
Multiply wound Polyakov loops at strong coupling,” arXiv:hepth/0603190
"... We study the expectation value of a PolyakovMaldacena loop that wraps the thermal circle k times in strongly coupled N = 4 super YangMills theory. This is achieved by considering probe D3 and D5 brane embeddings in the dual black hole geometry. In contrast to multiply wound spatial Wilson loops, n ..."
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Cited by 58 (6 self)
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We study the expectation value of a PolyakovMaldacena loop that wraps the thermal circle k times in strongly coupled N = 4 super YangMills theory. This is achieved by considering probe D3 and D5 brane embeddings in the dual black hole geometry. In contrast to multiply wound spatial Wilson loops, nontrivial dependence on k is captured through D5 branes. We find N −2/3 corrections, 1.1 Phase structure of N = 4 SYM theory The phase structure of N = 4 super YangMills (SYM) theory at large N on S 3 × S 1 is of interest from both gravitational and field theoretic perspectives. The AdS/CFT correspondence [1] places both the weak and strong coupling regimes of the theory
∗Trek II: ∗n operations, open Wilson lines and the SeibergWitten map
, 2000
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Twisted Backgrounds, PPWaves and Nonlocal Field Theories
, 2003
"... We study partially supersymmetric planewave like deformations of string theories and Mtheory on brane backgrounds. These deformations are dual to nonlocal field theories. We calculate various expectation values of configurations of closed as well as open Wilson loops and Wilson surfaces in those t ..."
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Cited by 52 (4 self)
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We study partially supersymmetric planewave like deformations of string theories and Mtheory on brane backgrounds. These deformations are dual to nonlocal field theories. We calculate various expectation values of configurations of closed as well as open Wilson loops and Wilson surfaces in those theories. We also discuss the manifestation of the nonlocality structure in the supergravity backgrounds. A planewave like deformation of little string theory has also been studied.
Bubbling geometries for half BPS Wilson lines
 Int. J. Mod. Phys. A22
"... We consider the supergravity backgrounds that correspond to supersymmetric Wilson line operators in the context of AdS/CFT correspondence. We study the gravitino and dilatino conditions of the IIB supergravity under the appropriate ansatz, and obtain some necessary conditions for a supergravity back ..."
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Cited by 49 (1 self)
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We consider the supergravity backgrounds that correspond to supersymmetric Wilson line operators in the context of AdS/CFT correspondence. We study the gravitino and dilatino conditions of the IIB supergravity under the appropriate ansatz, and obtain some necessary conditions for a supergravity background that preserves the same symmetry as the supersymmetric Wilson lines. The supergravity solutions are characterized by continuous version of maya diagrams. This diagram is related to the eigenvalue distribution of the Gaussian matrix model. We also In the gauge theory, the most important class of nonlocal operators is the Wilson loop operators. Especially, in N = 4 super YangMills theory, the Wilson loops with the scalar term are the most fundamental ones. The form of this class of operators is
Supersymmetric Wilson loops
"... I construct 1/16, 1/8 and 1/4 BPS Wilson loops in N = 4 supersymmetric YangMills theory and argue that expectation values of 1/4 BPS loops do not receive quantum corrections. At strong coupling, nonrenormalization of supersymmetric Wilson loops implies subtle cancellations in the partition functio ..."
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Cited by 48 (2 self)
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I construct 1/16, 1/8 and 1/4 BPS Wilson loops in N = 4 supersymmetric YangMills theory and argue that expectation values of 1/4 BPS loops do not receive quantum corrections. At strong coupling, nonrenormalization of supersymmetric Wilson loops implies subtle cancellations in the partition function of the AdS string with special boundary conditions. The cancellations are shown to occur in the semiclassical approximation. 1