Inflation with a Weyl term, or ghosts at work

N. Deruelle (1) , M. Sasaki (2) , Y. Sendouda (3) , A. Youssef (3)

1 APC - THEORIE
2 YITP - Yukawa Institute for Theoretical Physics [Kyoto]
3 APC (UMR_7164) - AstroParticule et Cosmologie

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.

Domaines: Relativité Générale et Cosmologie Quantique [gr-qc]; Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique des Hautes Energies - Théorie [hep-th]

N. Deruelle, M. Sasaki, Y. Sendouda, A. Youssef. Inflation with a Weyl term, or ghosts at work. Journal of Cosmology and Astroparticle Physics, 2011, 03, pp.040. ⟨10.1088/1475-7516/2011/03/040⟩. ⟨hal-00740754⟩