Inflationary universe with anisotropic hair

Masaaki Watanabe, Sugumi Kanno, Jiro Soda

Research output: Contribution to conferencePaperpeer-review

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 counter example to the cosmic no-hair conjecture.

Original languageEnglish
Pages379-383
Number of pages5
Publication statusPublished - 2009
Externally publishedYes
Event19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan
Duration: Nov 30 2009Dec 4 2009

Other

Other19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
Country/TerritoryJapan
CityTokyo
Period11/30/0912/4/09

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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