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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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 |
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R-134 |
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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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1782028571275952128 |