Thermal Partition Functions for S-branes
Abstract
We calculate the thermal partition functions of open strings on the S-brane backgrounds (the bouncing or rolling tachyon backgrounds) both in the bosonic and superstring cases. According to hep-th/0302146, we consider the discretized temperatures compatible with the pure imaginary periodicity of tachyon profiles. The ``effective Hagedorn divergence'' is shown to appear no matter how low temperature is chosen (including zero-temperature). This feature is likely to be consistent with the large rate of open string pair production discussed in hep-th/0209090 and also emission of closed string massive modes hep-th/0303139. We also discuss the possibility to remove the divergence by considering the space-like linear dilaton backgrounds as in hep-th/0306132.
Cite
@article{arxiv.hep-th/0307034,
title = {Thermal Partition Functions for S-branes},
author = {Yuji Sugawara},
journal= {arXiv preprint arXiv:hep-th/0307034},
year = {2009}
}
Comments
33 pages, no figure; v2 typos corrected, a reference added