ar X iv : a st ro - p h / 02 01 16 7 v 1 1 0 Ja n 20 02 On the stability of de Sitter inflationary background solution in scalar - tensor cosmology
نویسنده
چکیده
The stability of de Sitter metric in spacetimes where inflaton fields are non-minimally coupled to propagating torsion is investigated. It is shown that the de Sitter background metric is unstable against small perturbations. Axionic torsion is generated by inflaton fluctuations and the analysis of cosmological perturbations in Einstein-Cartan-Klein-Gordon (ECKG) equations is undertaken. Instabilities in the inflaton massless modes are found when the minimal coupling constant dominates. Inflaton fluctuations trigger axionic torsion vector fluctuations. The ECKG equations reduce to Einstein-de Sitter equations in the case of a constant background inflaton field. On the stability of de Sitter metric and torsion.
منابع مشابه
ar X iv : g r - qc / 0 41 01 43 v 4 3 1 Ja n 20 05 de Sitter inflationary expansion from a noncompact KK theory : a nonperturbative quantum ( scalar ) field formalism
de Sitter inflationary expansion from a noncompact KK theory: a nonperturbative quantum (scalar) field formalism Abstract We develop a nonperturbative quantum scalar field formalism from a non-compact Kaluza-Klein (KK) theory using the induced-matter theory of gravity during inflation. We study the particular case of a de Sitter expansion for the universe.
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