1201.5309 (Kei Yamamoto et al.)

Inflation with Multi-Vector-Hair: The Fate of Anisotropy    [PDF]

Kei Yamamoto, Masa-aki Watanabe, Jiro Soda

We study inflation with multiple vector fields. In the presence of
non-trivial couplings between the inflaton and the vector fields, it turns out
that no-hair conjecture does not hold and vector-hair appears. In the case of
uniform couplings, nevertheless, we find that the universe approaches an
isotropic final state after transient anisotropic inflationary phases. For
general couplings, we numerically show attractors are anisotropic inflation.
Even in these cases, it turns out that the inflation always tends to minimize
the anisotropy in the expansion of the universe.

View original: http://arxiv.org/abs/1201.5309