Inflationary universe with anisotropic hair

Masa Aki Watanabe, Sugumi Kanno, Jiro Soda

Research output: Contribution to journalArticlepeer-review

270 Citations (Scopus)

Abstract

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 counterexample to the cosmic no-hair conjecture.

Original languageEnglish
Article number191302
JournalPhysical review letters
Volume102
Issue number19
DOIs
Publication statusPublished - May 14 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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