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Rolling tachyon with electromagnetic field in linear dilaton background,” hepth/0312149
"... Rolling tachyon in linear dilaton background is examined by using an effective field theory with gauge field on an unstable Dbrane in bosonic string theory. Several solutions are identified with tachyon matter equipped with constant electromagnetic field in linear dilaton background. The time evolu ..."
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Rolling tachyon in linear dilaton background is examined by using an effective field theory with gauge field on an unstable Dbrane in bosonic string theory. Several solutions are identified with tachyon matter equipped with constant electromagnetic field in linear dilaton background. The time evolution of effective coupling and the nature of propagating fluctuation modes around the tachyon The decay of unstable Dbrane can be described by tachyon condensation. The time dependent process of tachyon condensation called rolling tachyon has recently received much attention. It is found that the tachyon condensation leaves behind some objects equipped with the same energy density as the original unstable Dbrane tension and the
Proposal for the open string tachyon effective action in the linear dilaton background,” JHEP 0406
, 2004
"... Abstract: In this paper we propose tachyon effective actions for unstable Dbranes in superstring and bosonic string theories in the presence of the linear dilaton background. Keywords: Dbranes. Contents ..."
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Abstract: In this paper we propose tachyon effective actions for unstable Dbranes in superstring and bosonic string theories in the presence of the linear dilaton background. Keywords: Dbranes. Contents
Dbrane effective actions and particle production near the beginning of the tachyon condensation,” arXiv:hepth/0312086
"... Abstract: In this paper we will study the quantum field theory of fluctuation modes around the classical solution that describes tachyon condensation on unstable Dbrane. We will calculate the number of particle produced at times near the beginning of the rolling tachyon process. We will perform thi ..."
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Abstract: In this paper we will study the quantum field theory of fluctuation modes around the classical solution that describes tachyon condensation on unstable Dbrane. We will calculate the number of particle produced at times near the beginning of the rolling tachyon process. We will perform this calculation for different tachyon effective actions and we will find that the rate of particle production strongly depends on the form of the effective action used for the description of the early stage of the tachyon condensation. Contents
A Toy Model of Closed String Tachyon Effective Action
, 2004
"... Abstract: In this paper we propose the toy model of the closed string tachyon effective action that has marginal tachyon profile as its exact solution in case of constant or linear dilaton background. Then we will apply this model for description of two dimensional bosonic string theory. We will fin ..."
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Abstract: In this paper we propose the toy model of the closed string tachyon effective action that has marginal tachyon profile as its exact solution in case of constant or linear dilaton background. Then we will apply this model for description of two dimensional bosonic string theory. We will find that the background configuration with the spatial dependent linear dilaton, flat spacetime metric and marginal tachyon profile is the exact solution of our model even if we take into account backreaction of tachyon on dilaton and on metric.
hepth/0607188 ZZ Brane Decay in D Dimensions
, 2006
"... In this paper we consider the ZZ brane decay in a Ddimensional background with a linear dilaton and a Liouville potential switched on. We mainly calculate the closed string emission rate during the decay process. For the case of a spacelike dilaton we find a similar Hagedorn behavior, in the closed ..."
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In this paper we consider the ZZ brane decay in a Ddimensional background with a linear dilaton and a Liouville potential switched on. We mainly calculate the closed string emission rate during the decay process. For the case of a spacelike dilaton we find a similar Hagedorn behavior, in the closed string UV region, with the brane decay in the usual 26d and 2d bosonic string theory. This means that all of the energy of the original brane converts into outgoing closed strings. In the IR region the result is finite. We also String theory in timedependent backgrounds is one of the most important questions that need to be understood. Dealing with general timedependent backgrounds is still out of our abilities. Therefore simple solvable models, capturing some important aspects of the realistic physics, are laboratories for theoretical ideas and tools, which may give us some
Particle Production in Tachyon Condensation
, 2008
"... We study particle production in the tachyon condensation process as described by different effective actions for the tachyon. By making use of invariant operators, we are able to obtain exact results for the density of produced particles, which is shown to depend strongly on the specific action. In ..."
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We study particle production in the tachyon condensation process as described by different effective actions for the tachyon. By making use of invariant operators, we are able to obtain exact results for the density of produced particles, which is shown to depend strongly on the specific action. In particular, the rate of particle production remains finite only for one of the actions considered, hence confirming results previously appeared in the literature. 1
Liouville Field Theory  A decade after the revolution
, 2004
"... We review recent developments (up to January 2004) of the Liouville field theory and its matrix model dual. This review consists of three parts. In the part I, we review the bosonic Liouville theory. After briefly reviewing the necessary background, we discuss the bulk structure constants (the DOZZ ..."
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We review recent developments (up to January 2004) of the Liouville field theory and its matrix model dual. This review consists of three parts. In the part I, we review the bosonic Liouville theory. After briefly reviewing the necessary background, we discuss the bulk structure constants (the DOZZ formula) and the boundary states (the FZZT brane and the ZZ brane). Various applications are also presented. In the part II, we review the supersymmetric extension of the Liouville theory. We first discuss the bulk structure constants and the branes as in the bosonic Liouville theory, and then we present the matrix dual descriptions with some applications. In the part III, the Liouville theory on unoriented surfaces is reviewed. After introducing the crosscap state, we discuss the matrix model dual description and the tadpole cancellation condition. This review also includes some original material such as the derivation of the conjectured dual action for the N = 2 Liouville theory from other known dualities and the comparison of the Liouville crosscap state with the c = 0 unoriented matrix model. This is