Inflation with a Weyl term, or ghosts at work

Details Inflation with a Weyl term, or ghosts at work Inflation with a Weyl term, or ghosts at work

2010-12-23

arxiv.org/abs/1012.5202v1

JCAP 1103:040,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 4 figures

Scientific paper

10.1088/1475-7516/2011/03/040

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 result is that vector perturbations can no longer be
ignored and that scalar modes diverge in the newtonian gauge but remain bounded
in the comoving slicing.

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