Thursday, January 26, 2012

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

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