Results 1  10
of
69
String Field Theory
"... This paper refers to seven figures (not included). Hard copies of the figures will be mailed upon request. ..."
Abstract

Cited by 211 (18 self)
 Add to MetaCart
This paper refers to seven figures (not included). Hard copies of the figures will be mailed upon request.
String Field Theory Around the Tachyon Vacuum
, 2000
"... Assuming that around the tachyon vacuum the kinetic term of cubic open string field theory is made purely of ghost operators we are led to gauge invariant actions which manifestly implement the absence of open string dynamics around this vacuum. We test this proposal by showing the existence of lump ..."
Abstract

Cited by 154 (6 self)
 Add to MetaCart
Assuming that around the tachyon vacuum the kinetic term of cubic open string field theory is made purely of ghost operators we are led to gauge invariant actions which manifestly implement the absence of open string dynamics around this vacuum. We test this proposal by showing the existence of lump solutions of arbitrary codimension in this string field theory. The key ingredients in this analysis are certain assumptions about the analyticity properties of tachyon Green’s functions. With the help of some further assumptions about the properties of these Green’s functions, we also calculate the ratios of tensions of lump solutions of different dimensions. The result is in perfect agreement with the known answers for the ratios of tensions of Dbranes of different dimensions.
Dynamics with infinitely many time derivatives and rolling tachyons
 JHEP
, 2002
"... Both in string field theory and in padic string theory the equations of motion involve infinite number of time derivatives. We argue that the initial value problem is qualitatively different from that obtained in the limit of many time derivatives in that the space of initial conditions becomes str ..."
Abstract

Cited by 91 (6 self)
 Add to MetaCart
(Show Context)
Both in string field theory and in padic string theory the equations of motion involve infinite number of time derivatives. We argue that the initial value problem is qualitatively different from that obtained in the limit of many time derivatives in that the space of initial conditions becomes strongly constrained. We calculate the energymomentum tensor and study in detail time dependent solutions representing tachyons rolling on the padic string theory potentials. For even potentials we find surprising small oscillations at the tachyon vacuum. These are not conventional physical states but rather anharmonic oscillations with a nontrivial frequency–amplitude relation. When the potentials are not even, small oscillatory solutions around the bottom must grow in amplitude without a bound. Open string field theory resembles this latter case, the tachyon rolls to the bottom and ever growing oscillations ensue. We discuss the significance of these results for the issues of emerging closed strings and tachyon matter.
Boundary CFT Construction of Dbranes in Vacuum String Field Theory
, 2001
"... In previous papers we built (multiple) Dbranes in flat spacetime as classical solutions of the string field theory based on the tachyon vacuum. In this paper we construct classical solutions describing all Dbranes in any fixed spacetime background defined by a two dimensional CFT of central char ..."
Abstract

Cited by 81 (6 self)
 Add to MetaCart
In previous papers we built (multiple) Dbranes in flat spacetime as classical solutions of the string field theory based on the tachyon vacuum. In this paper we construct classical solutions describing all Dbranes in any fixed spacetime background defined by a two dimensional CFT of central charge 26. A key role is played by the geometrical definition of the sliver state in general boundary CFT’s. The correct values for ratios of Dbrane tensions arise because the norm of the sliver solution is naturally related to the disk partition function of the appropriate boundary CFT. We also explore the possibility of reproducing the known spectrum of physical states on a Dbrane as deformations of the sliver.
Dbranes, tachyons, and string field theory
, 2003
"... In these notes we provide a pedagogical introduction to the subject of tachyon condensation in Witten’s cubic bosonic open string field theory. We use both the lowenergy YangMills description and the language of string field theory to explain the problem of tachyon condensation on unstable Dbra ..."
Abstract

Cited by 76 (4 self)
 Add to MetaCart
In these notes we provide a pedagogical introduction to the subject of tachyon condensation in Witten’s cubic bosonic open string field theory. We use both the lowenergy YangMills description and the language of string field theory to explain the problem of tachyon condensation on unstable Dbranes. We give a selfcontained introduction to open string field theory using both conformal field theory and overlap integrals. Our main subjects are the Sen conjectures on tachyon condensation in open string field theory and the evidence that supports these conjectures. We conclude with a discussion of vacuum string field theory and projectors of the staralgebra of open string fields. We comment on the possible role of string field theory in the construction of a nonperturbative formulation of string theory that captures all possible string backgrounds.
Comments on marginal deformations in open string field theory
"... In this short letter we present a class of remarkably simple solutions to Witten’s open string field theory that describe marginal deformations of the underlying boundary conformal field theory. The solutions we consider correspond to dimensionone matter primary operators that have nonsingular ope ..."
Abstract

Cited by 66 (2 self)
 Add to MetaCart
(Show Context)
In this short letter we present a class of remarkably simple solutions to Witten’s open string field theory that describe marginal deformations of the underlying boundary conformal field theory. The solutions we consider correspond to dimensionone matter primary operators that have nonsingular operator products with themselves. We briefly discuss application to rolling tachyons. 1 1
Analytic solutions for marginal deformations in open string field theory
, 2007
"... We develop a calculable analytic approach to marginal deformations in open string field theory using wedge states with operator insertions. For marginal operators with regular operator products, we construct analytic solutions to all orders in the deformation parameter. In particular, we construct a ..."
Abstract

Cited by 65 (9 self)
 Add to MetaCart
(Show Context)
We develop a calculable analytic approach to marginal deformations in open string field theory using wedge states with operator insertions. For marginal operators with regular operator products, we construct analytic solutions to all orders in the deformation parameter. In particular, we construct an exact timedependent solution that describes Dbrane decay and incorporates all α' corrections. For marginal operators with singular operator products, we construct solutions by regularizing the singularity and adding counterterms. We explicitly carry out the procedure to third order in the deformation parameter.
Analytic solutions for marginal deformations in open superstring field theory, arXiv:0704.0936 [hepth
"... We extend the calculable analytic approach to marginal deformations recently developed in open bosonic string field theory to open superstring field theory formulated by Berkovits. We construct analytic solutions to all orders in the deformation parameter when operator products Ever since the analyt ..."
Abstract

Cited by 58 (6 self)
 Add to MetaCart
We extend the calculable analytic approach to marginal deformations recently developed in open bosonic string field theory to open superstring field theory formulated by Berkovits. We construct analytic solutions to all orders in the deformation parameter when operator products Ever since the analytic solution for tachyon condensation in open bosonic string field theory [1]
Fundamental strings in open string theory at the tachyonic vacuum,” hepth/0010240
"... We show that the worldvolume theory on a Dpbrane at the tachyonic vacuum has solitonic string solutions whose dynamics is governed by the NambuGoto action of a string moving in (25+1) dimensional spacetime. This provides strong evidence for the conjecture that at this vacuum the full (25+1) dim ..."
Abstract

Cited by 57 (4 self)
 Add to MetaCart
(Show Context)
We show that the worldvolume theory on a Dpbrane at the tachyonic vacuum has solitonic string solutions whose dynamics is governed by the NambuGoto action of a string moving in (25+1) dimensional spacetime. This provides strong evidence for the conjecture that at this vacuum the full (25+1) dimensional Poincare invariance is restored. We also use this result to argue that the open string field theory at the tachyonic vacuum must contain closed string excitations.
Exact marginality in open string field theory: a general framework
, 2007
"... We construct analytic solutions of open bosonic string field theory for any exactly marginal deformation in any boundary conformal field theory when properly renormalized operator products of the marginal operator are given. We explicitly provide such renormalized operator products for a class of ma ..."
Abstract

Cited by 53 (6 self)
 Add to MetaCart
(Show Context)
We construct analytic solutions of open bosonic string field theory for any exactly marginal deformation in any boundary conformal field theory when properly renormalized operator products of the marginal operator are given. We explicitly provide such renormalized operator products for a class of marginal deformations which include the deformations of flat Dbranes in flat backgrounds by constant massless modes of the gauge field and of the scalar fields on the Dbranes, the cosine potential for a spacelike coordinate, and the hyperbolic cosine potential for the timelike coordinate. In our construction we use integrated vertex operators, which are closely related to finite deformations in boundary conformal field theory, while previous analytic solutions were based on unintegrated vertex operators. We also