Inflation from N-Forms and its stability

Details Inflation from N-Forms and its stability Inflation from N-Forms and its stability

2009-03-24

arxiv.org/abs/0903.4158v2

JHEP 0909:092,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

24 pages. Several new paragraphs and clarifications were added. A few typos corrected. JHEP in print

Scientific paper

10.1088/1126-6708/2009/09/092

Anisotropic and isotropic slow-roll inflation supported by n-forms are sought. Canonical field strengths and their duals are taken into account, and they are allowed to have a potential and also, when necessary for slow-roll, a nonminimal curvature coupling. New isotropic solutions are found for three-forms. It is also shown that some n-form actions are equivalent to f(R) gravity and scalar field models with possible nonminimal couplings. Anisotropic solutions are found for two-forms, generalising vector inflation, however, also the two-form is unstable during inflation due to the nonminimal coupling to curvature. We also address the stability of the isotropic background solutions supported by a triad of vectors .

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