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Journal of Cosmology and Astroparticle Physics 03 (2011) 040
Inflation with a Weyl term, or ghosts at work
N. Deruelle1, M. Sasaki2, Y. Sendouda1, A. Youssef1
(2011-03)

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.
1:  APC - UMR 7164 - AstroParticule et Cosmologie
2:  Yukawa Institute for Theoretical Physics
APC - THEORIE
Physics/General Relativity and Quantum Cosmology

Physics/High Energy Physics - Phenomenology

Physics/High Energy Physics - Theory
Fulltext link: 
http://fr.arXiv.org/abs/1012.5202