Anisotropy dissipation in brane-world inflation

Details Anisotropy dissipation in brane-world inflation Anisotropy dissipation in brane-world inflation

2000-11-29

arxiv.org/abs/gr-qc/0011105v3

Phys.Rev. D63 (2001) 063509

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, 5 figures; minor typo corrected in Eq. (16); matches version to appear in Phy Rev D

Scientific paper

10.1103/PhysRevD.63.063509

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.

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