Can broken rotational invariance be reconciled with inflation?

M. Peloso

School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA

Abstract: Motivated by claims of broken rotational invariance in the WMAP data, a number of models have appeared in the literature realizing this effect through vector field(s) with a nonvanishing spatial vacuum expectation value. We discuss why many such models have ghost instabilities.

Keywords: broken rotational invariance, ghost instability.

Received: 12.02.2012

DOI: 10.4213/tmf6760

 English version: Theoretical and Mathematical Physics, 2012, 170:2, 181–186

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