Results 1  10
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256
ElectricMagnetic duality and the geometric Langlands program
, 2006
"... The geometric Langlands program can be described in a natural way by compactifying on a Riemann surface C a twisted version of N = 4 super YangMills theory in four dimensions. The key ingredients are electricmagnetic duality of gauge theory, mirror symmetry of sigmamodels, branes, Wilson and ’t H ..."
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Cited by 292 (26 self)
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The geometric Langlands program can be described in a natural way by compactifying on a Riemann surface C a twisted version of N = 4 super YangMills theory in four dimensions. The key ingredients are electricmagnetic duality of gauge theory, mirror symmetry of sigmamodels, branes, Wilson and ’t Hooft operators, and topological field theory. Seemingly esoteric notions of the geometric Langlands program, such as Hecke
Tachyon condensation in string field theory
 JHEP 0003 (2000) 002 [arXiv:hepth/9912249
"... It has been conjectured that at a stationary point of the tachyon potential for the Dbrane of bosonic string theory, the negative energy density exactly cancels the Dbrane tension. We evaluate this tachyon potential by offshell calculations in open string field theory. Surprisingly, the condensat ..."
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Cited by 221 (9 self)
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It has been conjectured that at a stationary point of the tachyon potential for the Dbrane of bosonic string theory, the negative energy density exactly cancels the Dbrane tension. We evaluate this tachyon potential by offshell calculations in open string field theory. Surprisingly, the condensation of the tachyon mode alone into the stationary point of its cubic potential is found to cancel about 70 % of the Dbrane tension. Keeping relevant scalars up to four mass levels above the tachyon, the energy density at the shifted stationary point cancels 99 % of the Dbrane tension.
On exact tachyon potential in open string field theory
"... In these notes we revisit the tachyon lagrangian in the open string field theory using background independent approach of Witten from 1992. We claim that the tree level lagrangian (up to second order in derivatives and modulo some class of field redefinitions) is given by L = e −T (∂T) 2 + (1 + T)e ..."
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Cited by 199 (6 self)
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In these notes we revisit the tachyon lagrangian in the open string field theory using background independent approach of Witten from 1992. We claim that the tree level lagrangian (up to second order in derivatives and modulo some class of field redefinitions) is given by L = e −T (∂T) 2 + (1 + T)e −T. Upon obvious change of variables this leads to the potential energy −φ2 log φ2 with canonical kinetic term. This lagrangian may be also e obtained from the effective tachyon lagrangian of the padic strings in the limit p → 1. Applications to the problem of tachyon condensation are discussed.
Tachyon potentials, star products and universality
 JHEP 0109 (2001) 038 [arXiv:hepth/0006240
"... We develop an efficient recursive method to evaluate the tachyon potential using the relevant universal subalgebra of the open string star algebra. This method, using offshell versions of Virasoro Ward identities, avoids explicit computation of conformal transformations of operators and does not re ..."
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Cited by 178 (18 self)
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We develop an efficient recursive method to evaluate the tachyon potential using the relevant universal subalgebra of the open string star algebra. This method, using offshell versions of Virasoro Ward identities, avoids explicit computation of conformal transformations of operators and does not require a choice of background. We illustrate the procedure with a pedagogic computation of the level six tachyon potential in an arbitrary gauge, and the evaluation of a few simple star products. We give a background independent construction of the socalled identity of the star algebra, and show how it fits into family of string fields generating a commutative subalgebra. 1
Supersymmetric worldvolume action for nonBPS
 Dbranes,” JHEP
, 1999
"... We construct the worldvolume action for nonBPS Dbranes in type II string theories. This action is invariant under all the unbroken supersymmetries in the bulk, but these symmetries are realised as spontaneously broken symmetries in the worldvolume theory. Coupling of this action to background su ..."
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Cited by 175 (6 self)
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We construct the worldvolume action for nonBPS Dbranes in type II string theories. This action is invariant under all the unbroken supersymmetries in the bulk, but these symmetries are realised as spontaneously broken symmetries in the worldvolume theory. Coupling of this action to background supergravity fields is straightforward. We also discuss the fate of the U(1) gauge field on the Dbrane worldvolume after tachyon condensation. 1
Universality of the Tachyon Potential
 J. High Energy Phys
, 1999
"... Using string field theory, we argue that the tachyon potential on a Dbrane antiDbrane system in type II string theory in arbitrary background has a universal form, independent of the boundary conformal field theory describing the brane. This implies that if at the minimum of the tachyon potential ..."
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Cited by 174 (8 self)
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Using string field theory, we argue that the tachyon potential on a Dbrane antiDbrane system in type II string theory in arbitrary background has a universal form, independent of the boundary conformal field theory describing the brane. This implies that if at the minimum of the tachyon potential the total energy of the brane antibrane system vanishes in a particular background, then it vanishes in any other background. Similar result holds for the tachyon potential of the nonBPS Dbranes of type II string theory, and the Dbranes of bosonic string theory. 1
Fourdimensional String Compactifications with DBranes, Orientifolds and Fluxes
"... This review article provides a pedagogical introduction into various classes of chiral string compactifications to four dimensions with Dbranes and fluxes. The main concern is to provide all necessary technical tools to explicitly construct fourdimensional orientifold vacua, with the final aim to ..."
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Cited by 145 (18 self)
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This review article provides a pedagogical introduction into various classes of chiral string compactifications to four dimensions with Dbranes and fluxes. The main concern is to provide all necessary technical tools to explicitly construct fourdimensional orientifold vacua, with the final aim to come as close as possible to the supersymmetric Standard Model. Furthermore, we outline the available methods to derive the resulting fourdimensional effective action. Finally, we summarize recent attempts to address the
A Review on Tachyon Condensation in Open String Field Theories
"... We review the recent studies of tachyon condensation in string field theory. After introducing the open string field theory both for bosonic string and for superstring, we use them to examine the conjecture that the unstable configurations of the Dbrane will decay into the ‘closed string vacuum ’ t ..."
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Cited by 139 (4 self)
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We review the recent studies of tachyon condensation in string field theory. After introducing the open string field theory both for bosonic string and for superstring, we use them to examine the conjecture that the unstable configurations of the Dbrane will decay into the ‘closed string vacuum ’ through the tachyon condensation. And we describe the attemps to construct a lower dimensional bosonic Dbrane as an unstable lump solution of the string field equation. We obtain exact results from another formulation, background independent open string field theory. We also discuss some other topics which are related to tachyon condensation in string theory, such as the construction of a Dbrane as a noncommutative soliton
Remarks on tachyon condensation in superstring field theory
, 2000
"... We generalize recent results on tachyon condensation in boundary string field theory to the superstring. ..."
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Cited by 118 (6 self)
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We generalize recent results on tachyon condensation in boundary string field theory to the superstring.
Type IIA DBranes, KTheory, and Matrix Theory
, 1999
"... We show that all supersymmetric Type IIA Dbranes can be constructed as bound states of a certain number of unstable nonsupersymmetric Type IIA D9branes. This stringtheoretical construction demonstrates that Dbrane charges in Type IIA theory on spacetime manifold X are classified by the higher K ..."
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Cited by 115 (0 self)
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We show that all supersymmetric Type IIA Dbranes can be constructed as bound states of a certain number of unstable nonsupersymmetric Type IIA D9branes. This stringtheoretical construction demonstrates that Dbrane charges in Type IIA theory on spacetime manifold X are classified by the higher Ktheory group K−1 (X), as suggested recently by Witten. In particular, the system of N D0branes can be obtained, for any N, in terms of sixteen Type IIA D9branes. This suggests that the dynamics of Matrix theory is contained in the physics of magnetic vortices on the worldvolume of sixteen unstable D9branes, described at low energies by a U(16) gauge theory.