Tachyonization of the ΛCDM cosmological model

In this work a tachyonization of the ΛCDM model for a spatially flat Friedmann-Robertson-Walker space-time is proposed. A tachyon field and a cosmological constant are considered as the sources of the gravitational field. Starting from a stability analysis and from the exact solutions for a standard...

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Detalles Bibliográficos
Autores principales: Chimento, Luis Pascual, Forte, Mónica Isabel
Publicado: 2010
Materias:
Cosmological models
Tachyon field
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v42_n6_p1523_Chimento
http://hdl.handle.net/20.500.12110/paper_00017701_v42_n6_p1523_Chimento
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00017701_v42_n6_p1523_Chimento
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spelling paper:paper_00017701_v42_n6_p1523_Chimento2023-06-08T14:21:37Z Tachyonization of the ΛCDM cosmological model Chimento, Luis Pascual Forte, Mónica Isabel Cosmological models Tachyon field In this work a tachyonization of the ΛCDM model for a spatially flat Friedmann-Robertson-Walker space-time is proposed. A tachyon field and a cosmological constant are considered as the sources of the gravitational field. Starting from a stability analysis and from the exact solutions for a standard tachyon field driven by a given potential, the search for a large set of cosmological models which contain the ΛCDM model is investigated. By the use of internal transformations two new kinds of tachyon fields are derived from the standard tachyon field, namely, a complementary and a phantom tachyon fields. Numerical solutions for the three kinds of tachyon fields are determined and it is shown that the standard and complementary tachyon fields reproduces the ΛCDM model as a limiting case. The standard tachyon field can also describe a transition from an accelerated to a decelerated regime, behaving as an inflationary field at early times and as a matter field at late times. The complementary tachyon field always behaves as a matter field. The phantom tachyon field is characterized by a rapid expansion where its energy density increases with time. © 2010 Springer Science+Business Media, LLC. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Forte, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v42_n6_p1523_Chimento http://hdl.handle.net/20.500.12110/paper_00017701_v42_n6_p1523_Chimento
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmological models
Tachyon field
spellingShingle Cosmological models
Tachyon field
Chimento, Luis Pascual
Forte, Mónica Isabel
Tachyonization of the ΛCDM cosmological model
topic_facet Cosmological models
Tachyon field
description In this work a tachyonization of the ΛCDM model for a spatially flat Friedmann-Robertson-Walker space-time is proposed. A tachyon field and a cosmological constant are considered as the sources of the gravitational field. Starting from a stability analysis and from the exact solutions for a standard tachyon field driven by a given potential, the search for a large set of cosmological models which contain the ΛCDM model is investigated. By the use of internal transformations two new kinds of tachyon fields are derived from the standard tachyon field, namely, a complementary and a phantom tachyon fields. Numerical solutions for the three kinds of tachyon fields are determined and it is shown that the standard and complementary tachyon fields reproduces the ΛCDM model as a limiting case. The standard tachyon field can also describe a transition from an accelerated to a decelerated regime, behaving as an inflationary field at early times and as a matter field at late times. The complementary tachyon field always behaves as a matter field. The phantom tachyon field is characterized by a rapid expansion where its energy density increases with time. © 2010 Springer Science+Business Media, LLC.
author Chimento, Luis Pascual
Forte, Mónica Isabel
author_facet Chimento, Luis Pascual
Forte, Mónica Isabel
author_sort Chimento, Luis Pascual
title Tachyonization of the ΛCDM cosmological model
title_short Tachyonization of the ΛCDM cosmological model
title_full Tachyonization of the ΛCDM cosmological model
title_fullStr Tachyonization of the ΛCDM cosmological model
title_full_unstemmed Tachyonization of the ΛCDM cosmological model
title_sort tachyonization of the λcdm cosmological model
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v42_n6_p1523_Chimento
http://hdl.handle.net/20.500.12110/paper_00017701_v42_n6_p1523_Chimento
work_keys_str_mv AT chimentoluispascual tachyonizationofthelcdmcosmologicalmodel
AT fortemonicaisabel tachyonizationofthelcdmcosmologicalmodel
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