Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2011/06/037
Keywords
inflation; physics of the early universe
Funding
- JSPS (Japan)
- Ministry of Education, Science and Culture of Japan [22540274]
- JSPS under the Japan-Russia Research Cooperative Program
- [21244033]
- [22244030]
- [21111006]
- Grants-in-Aid for Scientific Research [22244030, 21111006] Funding Source: KAKEN
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We study an anisotropic inflation model with a gauge kinetic function for a non-abelian gauge field. We find that in contrast to abelian models, the anisotropy can be either a prolate or an oblate type, which could lead to a different prediction from abelian models for the statistical anisotropy in the power spectrum of cosmological fluctuations. During a reheating phase, we find chaotic behaviour of the non-abelian gauge field which is caused by the nonlinear self-coupling of the gauge field. We compute a Lyapunov exponent of the chaos which turns out to be uncorrelated with the anisotropy.
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