Cosmological solutions of the semiclassical Einstein-Dirac equations

Exact solutions to the semiclassical backreaction equations with an unquantised Dirac field are found when the ratio of the renormalisation parameters beta and alpha is 9/4. For alpha (0 there is a one-parameter family of solutions which do not have particle horizons and a two-parameter family of so...

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Autores principales: Chimento, L.P., Jakubi, A.S., Pensa, F.G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02649381_v7_n9_p1561_Chimento
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02649381_v7_n9_p1561_Chimento2023-10-03T15:13:19Z Cosmological solutions of the semiclassical Einstein-Dirac equations Chimento, L.P. Jakubi, A.S. Pensa, F.G. Exact solutions to the semiclassical backreaction equations with an unquantised Dirac field are found when the ratio of the renormalisation parameters beta and alpha is 9/4. For alpha (0 there is a one-parameter family of solutions which do not have particle horizons and a two-parameter family of solutions which oscillate at about the Planck frequency and, on average, behave asymptotically as a matter-dominated Friedmann solution. There is a two-parameter family with an asymptotically de Sitter stage, which is stable for any alpha )0 and beta )0. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jakubi, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pensa, F.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02649381_v7_n9_p1561_Chimento
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Exact solutions to the semiclassical backreaction equations with an unquantised Dirac field are found when the ratio of the renormalisation parameters beta and alpha is 9/4. For alpha (0 there is a one-parameter family of solutions which do not have particle horizons and a two-parameter family of solutions which oscillate at about the Planck frequency and, on average, behave asymptotically as a matter-dominated Friedmann solution. There is a two-parameter family with an asymptotically de Sitter stage, which is stable for any alpha )0 and beta )0.
format JOUR
author Chimento, L.P.
Jakubi, A.S.
Pensa, F.G.
spellingShingle Chimento, L.P.
Jakubi, A.S.
Pensa, F.G.
Cosmological solutions of the semiclassical Einstein-Dirac equations
author_facet Chimento, L.P.
Jakubi, A.S.
Pensa, F.G.
author_sort Chimento, L.P.
title Cosmological solutions of the semiclassical Einstein-Dirac equations
title_short Cosmological solutions of the semiclassical Einstein-Dirac equations
title_full Cosmological solutions of the semiclassical Einstein-Dirac equations
title_fullStr Cosmological solutions of the semiclassical Einstein-Dirac equations
title_full_unstemmed Cosmological solutions of the semiclassical Einstein-Dirac equations
title_sort cosmological solutions of the semiclassical einstein-dirac equations
url http://hdl.handle.net/20.500.12110/paper_02649381_v7_n9_p1561_Chimento
work_keys_str_mv AT chimentolp cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
AT jakubias cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
AT pensafg cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
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