Closed String Thermal Torus From Thermo Field Dynamics

Details Closed String Thermal Torus From Thermo Field Dynamics Closed String Thermal Torus From Thermo Field Dynamics

2004-10-06

arxiv.org/abs/hep-th/0410068v2

Phys.Lett.B613:213-220,2005

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, revtex4, changes in the text and references. Version to be published in Physics Letters B

Scientific paper

10.1016/j.j.physletb.2005.03.048

In this Letter a topological interpretation for the string thermal vacuum in the Thermo Field Dynamics (TFD) approach is given. As a consequence, the relationship between the Imaginary Time and TFD formalisms is achieved when both are used to study closed strings at finite temperature. The TFD approach starts by duplicating the system's degrees of freedom, defining an auxiliary (tilde) string. In order to lead the system to finite temperature a Bogoliubov transformation is implemented. We show that the effect of this transformation is to glue together the string and the tilde string to obtain a torus. The thermal vacuum appears as the boundary state for this identification. Also, from the thermal state condition, a Kubo-Martin-Schwinger condition for the torus topology is derived.

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