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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
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.
The identity string field and the tachyon vacuum
 JHEP
, 2001
"... Preprint typeset in JHEP style. HYPER VERSION ..."
Tachyon condensation in openclosed padic string theory
"... We study a simple model of padic closed and open strings. It sheds some light on the dynamics of tachyon condensation for both types of strings. We calculate the effect of static and decaying Dbrane configurations on the closed string background. For closed string tachyons we find lumps analogous ..."
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Cited by 28 (5 self)
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We study a simple model of padic closed and open strings. It sheds some light on the dynamics of tachyon condensation for both types of strings. We calculate the effect of static and decaying Dbrane configurations on the closed string background. For closed string tachyons we find lumps analogous to Dbranes. By studying their fluctuation spectrum and the Dbranes they admit, we argue that closed string lumps should be interpreted as spacetimes of lower dimensionality described by some noncritical padic string theory.
Large Nongaussianity from Nonlocal Inflation
 JCAP 0707, 017 (2007) [arXiv:0704.3426 [hepth]]; “Predictions for Nongaussianity from Nonlocal Inflation,” arXiv:0802.3218 [hepth
"... Abstract: We study the possibility of obtaining large nongaussian signatures in the Cosmic Microwave Background in a general class of singlefield nonlocal hilltop inflation models. We estimate the nonlinearity parameter fNL which characterizes nongaussianity in such models and show that large nong ..."
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Cited by 14 (3 self)
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Abstract: We study the possibility of obtaining large nongaussian signatures in the Cosmic Microwave Background in a general class of singlefield nonlocal hilltop inflation models. We estimate the nonlinearity parameter fNL which characterizes nongaussianity in such models and show that large nongaussianity is possible. For the recently proposed padic inflation model we find that fNL ∼ 120 when the string coupling is order unity. We show that large nongaussianity is also possible in a toy model with an action similar to
On the equation of the padic open string for the scalar tachyon field
 Prokhorenko, “On Some Nonlinear Integral Equation in the (Super)String Theory,” arXiv:mathph/0611068
"... Abstract. We study the structure of solutions of the onedimensional nonlinear pseudodifferential equation describing the dynamics of the padic open string for the scalar tachyon field p 1 2 ∂2 t Φ = Φ p. We elicit the role of real zeros of the entire function Φ p (z) and the behaviour of solution ..."
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Cited by 13 (1 self)
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Abstract. We study the structure of solutions of the onedimensional nonlinear pseudodifferential equation describing the dynamics of the padic open string for the scalar tachyon field p 1 2 ∂2 t Φ = Φ p. We elicit the role of real zeros of the entire function Φ p (z) and the behaviour of solutions Φ(t) in the neighbourhood of these zeros. We point out that discontinuous solutions can appear if p is even. We use the method of expanding the solution Φ and the function Φ p in the Hermite polynomials and modified Hermite polynomials and establish a connection between the coefficients of these expansions (integral conservation laws). For p = 2 we construct an infinite system of nonlinear equations in the unknown Hermite coefficients and study its structure. We consider the 3approximation. We indicate a connection between the problems stated and the nonlinear boundaryvalue problem for the heat equation. The dynamics of the open p–adic string for the scalar tachyon field is described by the nonlinear pseudodifferential equation [1]–[9] where
Quantum corrections in padic string theory,” arXiv:hepth/0105312
 19 M. Gutperle and A. Strominger, “Spacelike branes,” JHEP
, 2002
"... We compute loop corrections in padic open string field theory. We argue that quantum effects induce a pole with m 2 ∼ − ln g for the open string field at the locally stable vacuum. We also compute the one loop effective potential and show that the potential develops an imaginary piece when the fie ..."
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Cited by 10 (0 self)
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We compute loop corrections in padic open string field theory. We argue that quantum effects induce a pole with m 2 ∼ − ln g for the open string field at the locally stable vacuum. We also compute the one loop effective potential and show that the potential develops an imaginary piece when the field becomes tachyonic. 1
Towards pAdic String in Constant BField
, 2004
"... Spacetime properties of the tachyon of the padic string theory can be derived from a (nonlocal) action on the padic line Qp, thought of as the boundary of the ‘worldsheet’. We show that a term corresponding to the background of the antisymmetric second rank tensor field B can be added to this act ..."
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Cited by 7 (1 self)
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Spacetime properties of the tachyon of the padic string theory can be derived from a (nonlocal) action on the padic line Qp, thought of as the boundary of the ‘worldsheet’. We show that a term corresponding to the background of the antisymmetric second rank tensor field B can be added to this action. We examine the consequences of this term, in particular, its relation to a noncommutative deformation of the effective theory of the padic tachyon in spacetime.
Testing the Uniqueness of the Open Bosonic String Field Theory Vacuum,” hepth/0103103
"... Preprint typeset in JHEP style. HYPER VERSION ..."
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