Cosmological perturbations from vector inflation

Details Cosmological perturbations from vector inflation Cosmological perturbations from vector inflation

2009-03-17

arxiv.org/abs/0903.2977v2

Phys.Rev.D79:103524,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

minor changes, some references added; accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.79.103524

We analyze the behavior of linear perturbations in vector inflation. In contrast to the scalar field inflation, the linearized theory with vector fields contains couplings between scalar, vector and tensor modes. The perturbations decouple only in the ultraviolet limit, which allows us to carry out the canonical quantization. Superhorizon perturbations can be approximately analyzed due to suppressed mixing between different modes in the small fields models. We find that the vector perturbations of the metric decay exponentially, but the scalar and tensor modes could remain weakly coupled throughout the evolution. As a result, the vector inflation can produce significant correlations of the scalar and tensor modes in the CMB. For the realistic models the effect is rather small, but not negligible.

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