Anisotropy dissipation in brane-world inflation
Abstract
We examine the behavior of an anisotropic brane-world in the presence of inflationary scalar fields. We show that, contrary to naive expectations, a large anisotropy does not adversely affect inflation. On the contrary, a large initial anisotropy introduces more damping into the scalar field equation of motion, resulting in greater inflation. The rapid decay of anisotropy in the brane-world significantly increases the class of initial conditions from which the observed universe could have originated. This generalizes a similar result in general relativity. A unique feature of Bianchi I brane-world cosmology appears to be that for scalar fields with a large kinetic term the initial expansion of the universe is quasi-isotropic. The universe grows more anisotropic during an intermediate transient regime until anisotropy finally disappears during inflationary expansion.
Cite
@article{arxiv.gr-qc/0011105,
title = {Anisotropy dissipation in brane-world inflation},
author = {Roy Maartens and Varun Sahni and Tarun Deep Saini},
journal= {arXiv preprint arXiv:gr-qc/0011105},
year = {2009}
}
Comments
6 pages, 5 figures; minor typo corrected in Eq. (16); matches version to appear in Phy Rev D