Anisotropic inflation from vector impurity

Sugumi Kanno, Masashi Kimura, Jiro Soda, Shuichiro Yokoyama

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


We study an inflationary scenario with a vector impurity. We show that the universe undergoes anisotropic inflationary expansion due to a preferred direction determined by the vector. Using the slow roll approximation, we find a formula for determining the anisotropy of the inflationary universe. We discuss possible observable predictions of this scenario. In particular, it is stressed that primordial gravitational waves can be induced from curvature perturbations. Hence, even in low scale inflation, a sizable amount of primordial gravitational waves may be produced during inflation.

Original languageEnglish
Article number034
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
Publication statusPublished - Aug 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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