Anisotropic Inflation from Vector Impurity

Details Anisotropic Inflation from Vector Impurity Anisotropic Inflation from Vector Impurity

2008-06-15

arxiv.org/abs/0806.2422v3

JCAP0808:034,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 4 figures, improved section V, to be published in JCAP

Scientific paper

10.1088/1475-7516/2008/08/034

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 to determine 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.

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