From inflation to Friedmann regime in R2 cosmology

A cosmological model describing the different stages of the universe, i.e.: inflation, radiation dominated period and matter dominated (Friedmann-like) period is shown. The model consists of the usual gravitational lagrangian with a σ R2 term, and, for the matter content, the lagrangian of a massive...

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Autor principal: Laciana, C.E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004640X_v229_n2_p173_Laciana
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004640X_v229_n2_p173_Laciana
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spelling todo:paper_0004640X_v229_n2_p173_Laciana2023-10-03T14:02:49Z From inflation to Friedmann regime in R2 cosmology Laciana, C.E. A cosmological model describing the different stages of the universe, i.e.: inflation, radiation dominated period and matter dominated (Friedmann-like) period is shown. The model consists of the usual gravitational lagrangian with a σ R2 term, and, for the matter content, the lagrangian of a massive conformally coupled scalar field. The effect of backreaction is evaluated by means of an extremum condition on the entropy at each time. The differential equation, obtained when the lowest quantum order is considered, describes all the periods of evolution of the universe. For a range of values of σ, inflation is unstable and the universe can reach the following regime. © 1995 Kluwer Academic Publishers. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004640X_v229_n2_p173_Laciana
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A cosmological model describing the different stages of the universe, i.e.: inflation, radiation dominated period and matter dominated (Friedmann-like) period is shown. The model consists of the usual gravitational lagrangian with a σ R2 term, and, for the matter content, the lagrangian of a massive conformally coupled scalar field. The effect of backreaction is evaluated by means of an extremum condition on the entropy at each time. The differential equation, obtained when the lowest quantum order is considered, describes all the periods of evolution of the universe. For a range of values of σ, inflation is unstable and the universe can reach the following regime. © 1995 Kluwer Academic Publishers.
format JOUR
author Laciana, C.E.
spellingShingle Laciana, C.E.
From inflation to Friedmann regime in R2 cosmology
author_facet Laciana, C.E.
author_sort Laciana, C.E.
title From inflation to Friedmann regime in R2 cosmology
title_short From inflation to Friedmann regime in R2 cosmology
title_full From inflation to Friedmann regime in R2 cosmology
title_fullStr From inflation to Friedmann regime in R2 cosmology
title_full_unstemmed From inflation to Friedmann regime in R2 cosmology
title_sort from inflation to friedmann regime in r2 cosmology
url http://hdl.handle.net/20.500.12110/paper_0004640X_v229_n2_p173_Laciana
work_keys_str_mv AT lacianace frominflationtofriedmannregimeinr2cosmology
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