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154
String Field Theory
"... This paper refers to seven figures (not included). Hard copies of the figures will be mailed upon request. ..."
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Cited by 211 (18 self)
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This paper refers to seven figures (not included). Hard copies of the figures will be mailed upon request.
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 141 (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
Comments on Schnabl’s analytic solution for tachyon condensation in Witten’s open string field theory
 hepth/0603159. – 9
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Proof of vanishing cohomology at the tachyon vacuum
, 2006
"... We prove Sen’s third conjecture that there are no onshell perturbative excitations of the tachyon vacuum in open bosonic string field theory. The proof relies on the existence of a special state A, which, when acted on by the BRST operator at the tachyon vacuum, gives the identity. While this state ..."
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Cited by 88 (7 self)
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We prove Sen’s third conjecture that there are no onshell perturbative excitations of the tachyon vacuum in open bosonic string field theory. The proof relies on the existence of a special state A, which, when acted on by the BRST operator at the tachyon vacuum, gives the identity. While this state was found numerically in FeynmanSiegel gauge, here we give a simple analytic expression.
Open string states around a classical solution in vacuum string field theory
, 2001
"... We construct a classical solution of vacuum string field theory (VSFT) and study whether it represents the perturbative open string vacuum. Our solution is given as a squeezed state in the Siegel gauge, and it fixes the arbitrary coefficients in the BRST operator in VSFT. We identify the tachyon and ..."
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Cited by 84 (9 self)
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We construct a classical solution of vacuum string field theory (VSFT) and study whether it represents the perturbative open string vacuum. Our solution is given as a squeezed state in the Siegel gauge, and it fixes the arbitrary coefficients in the BRST operator in VSFT. We identify the tachyon and massless vector states as fluctuation modes around the classical solution. The tachyon mass squared α ′ m 2 t is given in a closed form using the Neumann coefficients defining the threestring vertex, and it reproduces numerically the expected value of −1 to high precision. The ratio of the potential height of the solution to the D25brane tension is also given in terms of the Neumann coefficients. However, the behavior of the potential height in level truncation does not match our expectation, though there are subtle points in the analysis.
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 ..."
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Cited by 81 (6 self)
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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.
Split string formalism and the closed string vacuum,” arXiv:hepth/0611200
"... The split string formalism offers a simple template upon which we can build many generalizations of Schnabl’s analytic solution of open string field theory. In this paper we explore two such generalizations: one which replaces the wedge state by an arbitrary function of wedge ..."
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Cited by 58 (5 self)
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The split string formalism offers a simple template upon which we can build many generalizations of Schnabl’s analytic solution of open string field theory. In this paper we explore two such generalizations: one which replaces the wedge state by an arbitrary function of wedge
Tachyon vacuum in cubic superstring field theory
 JHEP 01 (2008) 013, [0707.4591]. (Cited on
"... In this paper we give an exact analytic solution for tachyon condensation in the modified (picture 0) cubic superstring field theory. We prove the absence of cohomology and, crucially, reproduce the correct value for the Dbrane tension. The solution is surprising for two reasons: First, the existen ..."
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Cited by 56 (2 self)
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In this paper we give an exact analytic solution for tachyon condensation in the modified (picture 0) cubic superstring field theory. We prove the absence of cohomology and, crucially, reproduce the correct value for the Dbrane tension. The solution is surprising for two reasons: First, the existence of a tachyon vacuum in this theory has not been definitively established in the level expansion. Second, the solution vanishes in the GSO(−) sector, implying a “tachyon
Observables of string field theory
 JHEP 0201
"... We study gauge invariant operators of open string field theory and find a precise correspondence with onshell closed strings. We provide a detailed proof of the gauge invariance of the operators and a heuristic interpretation of their correlation functions in terms of onshell scattering amplitudes ..."
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Cited by 50 (2 self)
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We study gauge invariant operators of open string field theory and find a precise correspondence with onshell closed strings. We provide a detailed proof of the gauge invariance of the operators and a heuristic interpretation of their correlation functions in terms of onshell scattering amplitudes of closed strings. We also comment on the There are two kinds of physically meaningful quantities one can compute in a gauge theory. One is onshell scattering amplitude (the Smatrix), and the other is offshell correlation functions of gauge invariant quantities. In perturbative string theory, however, we only know how to compute onshell quantities. String field theory provides an interesting opportunity
Wedge states in string field theory
 JHEP
, 2003
"... The wedge states form an important subalgebra in the string field theory. We review and further investigate their various properties. We find in particular a novel expression for the wedge states, which allows to understand their star products purely algebraically. The method allows also for treatin ..."
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Cited by 50 (2 self)
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The wedge states form an important subalgebra in the string field theory. We review and further investigate their various properties. We find in particular a novel expression for the wedge states, which allows to understand their star products purely algebraically. The method allows also for treating the matter and ghost sectors separately. It turns out, that wedge states with different matter and ghost parts violate the associativity of the algebra. We introduce and study also wedge states with insertions of local operators and show how they are useful for obtaining exact results about convergence of level truncation calculations. These results help to clarify the issue of anomalies related to the identity and some exterior derivations in the string field algebra. 1