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Note on Dbrane effective action in the linear dilaton background
 JHEP 0311 (2003) 068 [arXiv:hepth/0310066
"... Abstract: In this paper we will study tachyon effective action for Dpbrane in bosonic string theory in the linear dilaton background. We obtain the tachyon effective Lagrangian from boundary state coeficient of Dpbrane in the linear dilaton background and compare it with tachyon effective Lagrangi ..."
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Abstract: In this paper we will study tachyon effective action for Dpbrane in bosonic string theory in the linear dilaton background. We obtain the tachyon effective Lagrangian from boundary state coeficient of Dpbrane in the linear dilaton background and compare it with tachyon effective Lagrangians that were proposed in previous papers. Keywords: Dbranes. Contents
Black Hole  String Transition and Rolling Dbrane
"... We investigate the black hole string transition in the twodimensional Lorentzian black hole system from the exact boundary states that describe the rolling Dbrane falling down into the twodimensional black hole. The black hole string phase transition is one of the fundamental properties of the ..."
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We investigate the black hole string transition in the twodimensional Lorentzian black hole system from the exact boundary states that describe the rolling Dbrane falling down into the twodimensional black hole. The black hole string phase transition is one of the fundamental properties of the nonsupersymmetric black holes in string theory, and we will reveal the nature of the phase transition from the exactly solvable worldsheet conformal field theory viewpoint. Since the twodimensional Lorentzian black hole system (SL(2; R)k/U(1) coset model at level k) typically appears as nearhorizon geometries of various singularities such as NS5branes in string theory, our results can be regarded as the probe of such singularities from the nonsupersymmetric probe rolling Dbrane. The exact construction of boundary states for the rolling D0brane falling down into the twodimensional Dbrane enables us to probe the phase transition at k = 1 directly in the physical amplitudes. During the study, we uncover three fundamental questions in string theory as a consistent theory of quantum gravity: small charge limit v.s. large charge limit of nonsupersymmetric quantum black holes, analyticity v.s. nonanalyticity in physical amplitudes and physical observables, and unitarity v.s. open closed duality in timedependent string backgrounds.
Remark about nonBPS Dpbrane at the tachyon vacuum moving in curved background,” arXiv:hepth/0504062
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Applications of Thirring Model to Inhomogenous Rolling Tachyon and Dissipative Quantum Mechanics
, 2008
"... We study the rolling tachyon and the dissipative quantum mechanics using the Thirring model with a boundary mass. We construct a boundary state for the dissipative quantum system in one dimension, which describes the system at the offcritical points as well as at the critical point. Then we extend ..."
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We study the rolling tachyon and the dissipative quantum mechanics using the Thirring model with a boundary mass. We construct a boundary state for the dissipative quantum system in one dimension, which describes the system at the offcritical points as well as at the critical point. Then we extend the Thirring model with a boundary mass in order to depict the time evolution of an unstable Dbranes with one direction wrapped on a circle of radius R, which is termed the inhomogeneous rolling tachyon. The analysis based on the Thirring model shows that the time dependent evolution of the inhomogeneous tachyon is possible only when 2 √ 3 < R < 2.
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
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