Non-BPS D9-branes in the Early Universe
Abstract
We have investigated the finite temperature systems of non-BPS D-branes and D-brane-anti-D-brane pairs in the previous papers. It has been shown that non-BPS D9-branes and D9-anti-D9 pairs become stable near the Hagedorn temperature on the basis of boundary string field theory. This implies that there is a possibility that these spacetime-filling branes exist in the early universe. We study the time evolution of the universe in the presence of non-BPS D9-branes on the basis of boundary string field theory in this paper. We try to construct the following scenario for the early universe: The universe expands at high temperature and the open string gas on the non-BPS D9-branes dominates the total energy of the system at first. The temperature decreases as the universe expands. Then the non-BPS D9-branes become unstable at low temperature and decay through tachyon condensation. We obtain some classical solutions for Einstein gravity and dilaton gravity in the very simple cases.
Keywords
Cite
@article{arxiv.hep-th/0601133,
title = {Non-BPS D9-branes in the Early Universe},
author = {Kenji Hotta},
journal= {arXiv preprint arXiv:hep-th/0601133},
year = {2009}
}
Comments
26 pages, 9 figures, comments and references added, minor errors corrected, version to appear in JHEP