Counting Closed String States in a Box

Details Counting Closed String States in a Box Counting Closed String States in a Box

1997-05-23

arxiv.org/abs/hep-th/9705185v1

Phys.Lett. B408 (1997) 183-191

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 5 Postscript figures

Scientific paper

The computation of the microcanonical density of states for a string gas in a finite volume needs a one by one count because of the discrete nature of the spectrum. We present a way to do it using geometrical arguments in phase space. We take advantage of this result in order to obtain the thermodynamical magnitudes of the system. We show that the results for an open universe exactly coincide with the infinite volume limit of the expression obtained for the gas in a box. For any finite volume the Hagedorn temperature is a maximum one, and the specific heat is always positive. We also present a definition of pressure compatible with R-duality seen as an exact symmetry, which allows us to make a study on the physical phase space of the system. Besides a maximum temperature the gas presents an asymptotic pressure.

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