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...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Chimento, L.P., Forte, M., Kremer, G.M., Ribas, M.O.
Formato:	JOUR
Materias:	Cosmological models Tachyon field
Acceso en línea:	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	todo:paper_00017701_v42_n6_p1523_Chimento
record_format	dspace
spelling	todo:paper_00017701_v42_n6_p1523_Chimento2023-10-03T13:52:07Z Tachyonization of the ΛCDM cosmological model Chimento, L.P. Forte, M. Kremer, G.M. Ribas, M.O. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, L.P. Forte, M. Kremer, G.M. Ribas, M.O. 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.
format	JOUR
author	Chimento, L.P. Forte, M. Kremer, G.M. Ribas, M.O.
author_facet	Chimento, L.P. Forte, M. Kremer, G.M. Ribas, M.O.
author_sort	Chimento, L.P.
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
url	http://hdl.handle.net/20.500.12110/paper_00017701_v42_n6_p1523_Chimento
work_keys_str_mv	AT chimentolp tachyonizationofthelcdmcosmologicalmodel AT fortem tachyonizationofthelcdmcosmologicalmodel AT kremergm tachyonizationofthelcdmcosmologicalmodel AT ribasmo tachyonizationofthelcdmcosmologicalmodel
_version_	1782029975607574528

Tachyonization of the ΛCDM cosmological model

Ejemplares similares