Inflation with a Weyl term, or ghosts at work

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 r...

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Veröffentlicht in:	Journal of cosmology and astroparticle physics 2011-03, Vol.2011 (3), p.040-40
Hauptverfasser:	Deruelle, Nathalie, Sasaki, Misao, Sendouda, Yuuiti, Youssef, Ahmed
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COSMOLOGY DISTURBANCES General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory INFLATIONARY UNIVERSE INFLATONS Physics SCALARS VECTORS WEYL UNIFIED THEORY
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Beschreibung
Zusammenfassung:	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.
ISSN:	1475-7516 1475-7508 1475-7516
DOI:	10.1088/1475-7516/2011/03/040