Results 1  10
of
11
Notes on noncritical superstrings in various dimensions
 JHEP
, 2003
"... We study noncritical superstrings propagating in d ≤ 6 dimensional Minkowski space or equivalently, superstrings propagating on the twodimensional Euclidean black hole tensored with ddimensional Minkowski space. We point out a subtlety in the construction of supersymmetric theories in these backg ..."
Abstract

Cited by 33 (7 self)
 Add to MetaCart
(Show Context)
We study noncritical superstrings propagating in d ≤ 6 dimensional Minkowski space or equivalently, superstrings propagating on the twodimensional Euclidean black hole tensored with ddimensional Minkowski space. We point out a subtlety in the construction of supersymmetric theories in these backgrounds, and explain how this does not allow a consistent geometric interpretation in terms of fields propagating on a cigarlike spacetime. We explain the global symmetries of the various theories by using their description as the near horizon geometry of wrapped NS5brane configurations. In the sixdimensional theory, we present a CFT description of the four dimensional moduli space and the global O(3) symmetry. The worldsheet action invariant under this symmetry contains both the N = 2 sineLiouville interaction and the cigar metric, thereby providing an example where the two interactions are naturally present in the same worldsheet lagrangian already at the nondynamical level.
NonCritical Pure Spinor Superstrings
, 2006
"... We construct noncritical pure spinor superstrings in two, four and six dimensions. We find explicitly the map between the RNS variables and the pure spinor ones in the linear dilaton background. The RNS variables map onto a patch of the pure spinor space and the holomorphic top form on the pure spi ..."
Abstract

Cited by 15 (3 self)
 Add to MetaCart
(Show Context)
We construct noncritical pure spinor superstrings in two, four and six dimensions. We find explicitly the map between the RNS variables and the pure spinor ones in the linear dilaton background. The RNS variables map onto a patch of the pure spinor space and the holomorphic top form on the pure spinor space is an essential ingredient of the mapping. A basic feature of the map is the requirement of doubling the superspace, which we analyze in detail. We study the structure of the noncritical pure spinor space, which is different from the tendimensional one, and its quantum anomalies. We compute the pure spinor lowest lying BRST cohomology and find an agreement with the RNS spectra. The analysis is generalized to curved backgrounds and we construct as an example the noncritical pure spinor type IIA superstring on AdS4 with RR 4form flux.
KUCP199 hepth/0112004 Coset Character Identities in Superstring Compactifications
, 2001
"... We apply the coset character identities (generalization of Jacobi’s abstruse identity) to compact and noncompact Gepner models. In the both cases, we prove that the partition function actually vanishes due to the spacetime supersymmetry. In the case of the compact models and discrete parts of the no ..."
Abstract
 Add to MetaCart
(Show Context)
We apply the coset character identities (generalization of Jacobi’s abstruse identity) to compact and noncompact Gepner models. In the both cases, we prove that the partition function actually vanishes due to the spacetime supersymmetry. In the case of the compact models and discrete parts of the noncompact models, the partition function includes the expected vanishing factor. But the character identities used to the continuous part of the noncompact models suggest that these models have twice as many supersymmetry as expected. This fact is an evidence for the conjecture that the holographically dual of the string theory on an actually singular CalabiYau manifold is a super conformal field The supersymmetric compactification of the string theory is an important problem in both the phenomenological and the formal sense. The internal space of the compactification should be a manifold of a special holonomy if we want to preserve some of the spacetime supersymmetry.
KUCP0193 hepth/0108219 Cascade of Special Holonomy Manifolds and Heterotic String Theory
, 2001
"... We investigate heterotic string theory on special holonomy manifolds including exceptional holonomy G2 and Spin(7) manifolds. The gauge symmetry is F4 in a G2 manifold compactification, and so(9) in a Spin(7) manifold compactification. We also study the cascade of the holonomies: so(8) ⊃ Spin(7) ⊃ ..."
Abstract
 Add to MetaCart
(Show Context)
We investigate heterotic string theory on special holonomy manifolds including exceptional holonomy G2 and Spin(7) manifolds. The gauge symmetry is F4 in a G2 manifold compactification, and so(9) in a Spin(7) manifold compactification. We also study the cascade of the holonomies: so(8) ⊃ Spin(7) ⊃ G2 ⊃ su(3) ⊃ su(2). The differences of adjoining groups are described by Ising, tricritical Ising, 3state Potts and u(1) models. These theories are essential for spacetime supersymmetries and gauge group enhancements. As concrete examples, we construct the modular invariant partition functions and analyze their massless spectra for G2 and Spin(7) orbifolds. We obtain the relation between topological numbers of the manifolds and multiplicities of matters in specific representations. 1
unknown title
, 2005
"... We construct a covariant description of noncritical superstrings in even dimensions. We construct explicitly supersymmetric hybrid type variables in a linear dilaton background, and study an underlying N = 2 twisted superconformal algebra structure. We find similarities between noncritical superst ..."
Abstract
 Add to MetaCart
(Show Context)
We construct a covariant description of noncritical superstrings in even dimensions. We construct explicitly supersymmetric hybrid type variables in a linear dilaton background, and study an underlying N = 2 twisted superconformal algebra structure. We find similarities between noncritical superstrings in 2n + 2 dimensions and critical superstrings compactified on CY4−n manifolds. We study the spectrum of the noncritical strings, and in particular the RamondRamond massless fields. We use the supersymmetric variables to construct the noncritical superstrings σmodel action in curved target space backgrounds with coupling to the RamondRamond fields. We consider as an example noncritical type IIA strings on AdS2 background with RamondRamond 2form flux.
March 1992 HU Berlin–IEP–92/1 String amplitudes in arbitrary dimensions
, 1992
"... We calculate gravitational dressed tachyon correlators in non critical dimensions. The 2D gravity part of the theory is constrained to constant curvature. Then scaling dimensions of gravitational dressed vertex operators are equal to their bare conformal dimensions. Considering the model as d+2 dime ..."
Abstract
 Add to MetaCart
(Show Context)
We calculate gravitational dressed tachyon correlators in non critical dimensions. The 2D gravity part of the theory is constrained to constant curvature. Then scaling dimensions of gravitational dressed vertex operators are equal to their bare conformal dimensions. Considering the model as d+2 dimensional critical string we calculate poles of generalized Shapiro–Virasoro amplitudes. 1
The Veneziano Limit of N = 2 Superconformal QCD: Towards the String Dual of N = 2 SU(Nc) SYM with Nf = 2Nc
"... ar ..."
(Show Context)
Aspects of Superconformal Field Theories
, 2011
"... Recently, a lot of progress has been made towards understanding the strongly coupled supersymmetric quantum gauge theories. The problem of strong coupling for SU(N) gauge theories can be formulated in two separate regimes of interest, one at finite N and the other at large N in ’t Hooft limit. In t ..."
Abstract
 Add to MetaCart
(Show Context)
Recently, a lot of progress has been made towards understanding the strongly coupled supersymmetric quantum gauge theories. The problem of strong coupling for SU(N) gauge theories can be formulated in two separate regimes of interest, one at finite N and the other at large N in ’t Hooft limit. In the first case electric/magnetic duality also called Sduality and in the second, AdS/CFT duality map the strongly coupled problem to a weakly coupled one. Both of the dualities have been well understood in the maximally supersymmetric 4d gauge theory, the N = 4 super YangMills. In this thesis, as a natural next step, we focus on the strong coupling behavior in N = 2 supersymmetric gauge theories. iii To my family.