Inflation with a Weyl term, or ghosts at work
- 1 March 2011
- journal article
- research article
- Published by IOP Publishing in Journal of Cosmology and Astroparticle Physics
- Vol. 2011 (03) , 040
Abstract
In order to assess the role of ghosts in cosmology, we study the evolution of linear cosmological perturbations during inflation when a Weyl term is added to the action. Our main results are that vector perturbations can no longer be ignored and that scalar modes diverge in the newtonian gauge but remain bounded in the comoving slicing.Keywords
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