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84
Superconformal Gauge Theories and NonCritical superstrings
, 2004
"... We consider effective actions for sixdimensional noncritical superstrings. We show that the addition of N units of RR flux and of Nf spacetime filling D5branes produces AdS5 × S 1 solutions with curvature comparable to the string scale. These solutions have the right structure to be dual to N = ..."
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Cited by 60 (0 self)
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We consider effective actions for sixdimensional noncritical superstrings. We show that the addition of N units of RR flux and of Nf spacetime filling D5branes produces AdS5 × S 1 solutions with curvature comparable to the string scale. These solutions have the right structure to be dual to N = 1 supersymmetric SU(N) gauge theories with Nf flavors. We further suggest bounds on the masssquared of tachyonic fields in this background that should restrict the theory to the conformal window.
Nonlocal Field Theories and Their Gravity Duals,” hepth/0103090
"... The gravity duals of nonlocal field theories in the large N limit exhibit a novel behavior near the boundary. To explore this, we present and study the duals of dipole theories – a particular class of nonlocal theories with fundamental dipole fields. The nonlocal interactions are manifest in the met ..."
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Cited by 54 (10 self)
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The gravity duals of nonlocal field theories in the large N limit exhibit a novel behavior near the boundary. To explore this, we present and study the duals of dipole theories – a particular class of nonlocal theories with fundamental dipole fields. The nonlocal interactions are manifest in the metric of the gravity dual and type0 string theories make a surprising appearance. We compare the situation to that in noncommutative At the boundary, the metric of AdSd+1, ds 2 = α′ u 2(dt 2 − dx 2 1 − · · · − dx 2 d−1 − du2), becomes infinite. This way the boundary is described by classical geometry, and quantum gravity on AdSd+1 can correspond to a local field theory on a classical space [1, 2, 3, 4].
Lectures on NonBPS Dirichlet branes
, 2000
"... A comprehensive introduction to the boundary state approach to Dirichlet branes is given. Various examples of BPS and nonBPS Dirichlet branes are discussed. In particular, the nonBPS states in the duality of Type IIA on K3 and the heterotic string on T 4 are analysed in detail. ..."
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Cited by 54 (6 self)
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A comprehensive introduction to the boundary state approach to Dirichlet branes is given. Various examples of BPS and nonBPS Dirichlet branes are discussed. In particular, the nonBPS states in the duality of Type IIA on K3 and the heterotic string on T 4 are analysed in detail.
Magnetic backgrounds and tachyonic instabilities in closed superstring theory and Mtheory
"... closed string theory ..."
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Modular invariance of strings on ppwaves with RRflux
 JHEP 0212
, 2002
"... We study the modular invariance of strings on ppwaves with RRflux. We explicitly show that the oneloop partition functions of the maximally supersymmetric ppwaves and their orbifolds can be modular invariant in spite of the mass terms in the lightcone gauge. From this viewpoint, we also determi ..."
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Cited by 30 (1 self)
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We study the modular invariance of strings on ppwaves with RRflux. We explicitly show that the oneloop partition functions of the maximally supersymmetric ppwaves and their orbifolds can be modular invariant in spite of the mass terms in the lightcone gauge. From this viewpoint, we also determine the spectrum of type 0B theory on ppwave and discuss its gauge theory dual. Furthermore, we investigate the spectrum of a nonsupersymmetric orbifold and point out its supersymmetry enhancement in the Penrose limit. 1
A Study of Black Brane Solutions in DDimensional Coupled Gravity System, preprint hepth/9903118
"... In this paper, we use only the equation of motion for an interacting system of gravity, dilaton and antisymmetric tensor to study the black brane solutions. By making use of the property of Schwarzian derivative, we obtain the complete solution of this system of equations. For some special values we ..."
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Cited by 23 (3 self)
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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 black brane solutions. By making use of the property of Schwarzian derivative, we obtain the complete solution of this system of equations. For some special values we obtain the wellknown BPS brane and black brane solutions.
Ramifications of lineland
 Turk. J. Phys
, 2006
"... Abstract: A nontechnical overview on gravity in two dimensions is provided. Applications discussed in this work comprise 2D type 0A/0B string theory, Black Hole evaporation/thermodynamics, toy models for quantum gravity, for numerical General Relativity in the context of critical collapse and for s ..."
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Cited by 19 (9 self)
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Abstract: A nontechnical overview on gravity in two dimensions is provided. Applications discussed in this work comprise 2D type 0A/0B string theory, Black Hole evaporation/thermodynamics, toy models for quantum gravity, for numerical General Relativity in the context of critical collapse and for solid state analogues of Black Holes. Mathematical relations to integrable models, nonlinear gauge theories, Poissonsigma models, KdV surfaces and noncommutative geometry are presented.
A new hat for the c = 1 matrix model
"... We consider two dimensional supergravity coupled to ĉ = 1 matter. This system can also be interpreted as noncritical type 0 string theory in a two dimensional target space. After reviewing and extending the traditional descriptions of this class of theories, we provide a matrix model description. Th ..."
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Cited by 19 (0 self)
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We consider two dimensional supergravity coupled to ĉ = 1 matter. This system can also be interpreted as noncritical type 0 string theory in a two dimensional target space. After reviewing and extending the traditional descriptions of this class of theories, we provide a matrix model description. The 0B theory is similar to the realization of two dimensional bosonic string theory via matrix quantum mechanics in an inverted harmonic oscillator potential; the difference is that we expand around a nonperturbatively stable vacuum, where the matrix eigenvalues are equally distributed on both sides of the potential. The 0A theory is described by a quiver matrix model. July
From Threebranes to Large N gauge Theories
, 1999
"... This is a brief introductory review of the AdS/CFT correspondence and of the ideas that led to its formulation. Emphasis is placed on dualities between conformal large N gauge theories in 4 dimensions and string backgrounds of the form AdS5×X5. Attempts to generalize this correspondence to asymptoti ..."
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Cited by 18 (0 self)
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This is a brief introductory review of the AdS/CFT correspondence and of the ideas that led to its formulation. Emphasis is placed on dualities between conformal large N gauge theories in 4 dimensions and string backgrounds of the form AdS5×X5. Attempts to generalize this correspondence to asymptotically free theories are also included.
Perturbative search for fixed lines in large N gauge theories
"... The logarithmic running of marginal doubletrace operators is a general feature of 4d field theories containing scalar fields in the adjoint or bifundamental representation. Such operators provide leading contributions in the large N limit; therefore, the leading terms in their beta functions must ..."
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Cited by 17 (1 self)
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The logarithmic running of marginal doubletrace operators is a general feature of 4d field theories containing scalar fields in the adjoint or bifundamental representation. Such operators provide leading contributions in the large N limit; therefore, the leading terms in their beta functions must vanish for a theory to be large N conformal. We calculate the oneloop beta functions in orbifolds of the N = 4 SYM theory by a discrete subgroup Γ of the SU(4) Rsymmetry, which are dual to string theory on AdS5 ×S 5 /Γ. We present a general strategy for determining whether there is a fixed line passing through the origin of the coupling constant space. Then we study in detail some classes of nonsupersymmetric orbifold theories, and emphasize the importance of decoupling the U(1) factors. Among our examples, which include orbifolds acting freely on the S 5, we do not find any large N nonsupersymmetric theories with fixed lines passing through the origin. Connection of these results with closed string tachyon condensation in AdS5 × S 5 /Γ is discussed. Soon after the AdSd+1/CFTd correspondence was formulated [1, 2, 3] (see [4, 5] for reviews),