On cosmic inflation in vector field theories

Details On cosmic inflation in vector field theories On cosmic inflation in vector field theories

2011-09-22

arxiv.org/abs/1109.4838v4

Classical and Quantum Gravity, 28 (2011), 245018

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages; a few minor typos corrected; published version

Scientific paper

10.1088/0264-9381/28/24/245018

We investigate the longitudinal ghost issue in Abelian vector inflation. It turns out that, within the class of Lorentz-invariant vector field theories with three degrees of freedom and without any extra (scalar) fields, the possibilities are essentially exhausted by the classical solution due to Larry Ford with an extremely flat potential which doesn't feel the fast roll of its argument. And, moreover, one needs to fulfil an extra condition on that potential in order to avoid severe gradient instability. At the same time, some Lorentz-violating modifications are worth to be explored.

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