Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-03-02
Phys.Rev. D70 (2004) 086010
Physics
High Energy Physics
High Energy Physics - Theory
39 pages, 17 figures, v3: references added
Scientific paper
10.1103/PhysRevD.70.086010
We construct a time-dependent solution in vacuum string field theory and investigate whether the solution can be regarded as a rolling tachyon solution. First, compactifying one space direction on a circle of radius R, we construct a space-dependent solution given as an infinite number of *-products of a string field with center-of-mass momentum dependence of the form e^{-b p^2/4}. Our time-dependent solution is obtained by an inverse Wick rotation of the compactified space direction. We focus on one particular component field of the solution, which takes the form of the partition function of a Coulomb system on a circle with temperature R^2. Analyzing this component field both analytically and numerically using Monte Carlo simulation, we find that the parameter b in the solution must be set equal to zero for the solution to approach a finite value in the large time limit x^0\to\infty. We also explore the possibility that the self-dual radius R=\sqrt{\alpha'} is a phase transition point of our Coulomb system.
Fujita Masako
Hata Hiroyuki
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