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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Detalles Bibliográficos
Autores principales: Chimento, Luis Pascual, Jakubi, Alejandro Silvio, Pensa, Fabián Gabriel
Publicado: 1990
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v7_n9_p1561_Chimento
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
id paper:paper_02649381_v7_n9_p1561_Chimento
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spelling paper:paper_02649381_v7_n9_p1561_Chimento2023-06-08T15:23:30Z Cosmological solutions of the semiclassical Einstein-Dirac equations Chimento, Luis Pascual Jakubi, Alejandro Silvio Pensa, Fabián Gabriel 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. 1990 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v7_n9_p1561_Chimento 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.
author Chimento, Luis Pascual
Jakubi, Alejandro Silvio
Pensa, Fabián Gabriel
spellingShingle Chimento, Luis Pascual
Jakubi, Alejandro Silvio
Pensa, Fabián Gabriel
Cosmological solutions of the semiclassical Einstein-Dirac equations
author_facet Chimento, Luis Pascual
Jakubi, Alejandro Silvio
Pensa, Fabián Gabriel
author_sort Chimento, Luis Pascual
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
publishDate 1990
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02649381_v7_n9_p1561_Chimento
http://hdl.handle.net/20.500.12110/paper_02649381_v7_n9_p1561_Chimento
work_keys_str_mv AT chimentoluispascual cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
AT jakubialejandrosilvio cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
AT pensafabiangabriel cosmologicalsolutionsofthesemiclassicaleinsteindiracequations
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