Inflationary Universe with Anisotropic Hair

Details Inflationary Universe with Anisotropic Hair Inflationary Universe with Anisotropic Hair

2009-02-17

arxiv.org/abs/0902.2833v2

Phys.Rev.Lett.102:191302,2009

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, 2 figures; an error in abstract corrected; (v2) replaced with version accepted by PRL, title changed from "Hairy Inf

Scientific paper

10.1103/PhysRevLett.102.191302

We study an inflationary scenario with a vector field coupled with an inflaton field and show that the inflationary universe is endowed with anisotropy for a wide range of coupling functions. This anisotropic inflation is a tracking solution where the energy density of the vector field follows that of the inflaton field irrespective of initial conditions. We find a universal relation between the anisotropy and a slow-roll parameter of inflation. Our finding has observational implications and gives a counter example to the cosmic no-hair conjecture.

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