Unified model of baryonic matter and dark components
We investigate an interacting two-fluid cosmological model and introduce a scalar field representation by means of a linear combination of the individual energy densities. Applying the integrability condition to the scalar field equation we show that this "exotic quintessence" is driven by...
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2008
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v666_n3_p205_Chimento http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_03702693_v666_n3_p205_Chimento_oai |
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I28-R145-paper_03702693_v666_n3_p205_Chimento_oai2020-10-19 Chimento, L.P. Forte, M. 2008 We investigate an interacting two-fluid cosmological model and introduce a scalar field representation by means of a linear combination of the individual energy densities. Applying the integrability condition to the scalar field equation we show that this "exotic quintessence" is driven by an exponential potential and the two-fluid mixture can be considered as a model of three components. These components are associated with baryonic matter, dark matter and dark energy respectively. We use the Simon, Verde and Jimenez [J. Simon, L. Verde, R. Jimenez, Phys. Rev. D 71 (2005) 123001] determination of the redshift dependence of the Hubble parameter to constrain the current density parameters of this model. With the best fit density parameters we obtain the transition redshift between non-accelerated and accelerated regimes zacc = 0.66 and the time elapsed since the initial singularity t0 = 19.8 Gyr. We study the perturbation evolution of this model and find that the energy density perturbation decreases with the cosmological time. © 2008 Elsevier B.V. All rights reserved. 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. application/pdf http://hdl.handle.net/20.500.12110/paper_03702693_v666_n3_p205_Chimento info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Phys Lett Sect B Nucl Elem Part High-Energy Phys 2008;666(3):205-211 Unified model of baryonic matter and dark components info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_03702693_v666_n3_p205_Chimento_oai |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
| description |
We investigate an interacting two-fluid cosmological model and introduce a scalar field representation by means of a linear combination of the individual energy densities. Applying the integrability condition to the scalar field equation we show that this "exotic quintessence" is driven by an exponential potential and the two-fluid mixture can be considered as a model of three components. These components are associated with baryonic matter, dark matter and dark energy respectively. We use the Simon, Verde and Jimenez [J. Simon, L. Verde, R. Jimenez, Phys. Rev. D 71 (2005) 123001] determination of the redshift dependence of the Hubble parameter to constrain the current density parameters of this model. With the best fit density parameters we obtain the transition redshift between non-accelerated and accelerated regimes zacc = 0.66 and the time elapsed since the initial singularity t0 = 19.8 Gyr. We study the perturbation evolution of this model and find that the energy density perturbation decreases with the cosmological time. © 2008 Elsevier B.V. All rights reserved. |
| format |
Artículo Artículo publishedVersion |
| author |
Chimento, L.P. Forte, M. |
| spellingShingle |
Chimento, L.P. Forte, M. Unified model of baryonic matter and dark components |
| author_facet |
Chimento, L.P. Forte, M. |
| author_sort |
Chimento, L.P. |
| title |
Unified model of baryonic matter and dark components |
| title_short |
Unified model of baryonic matter and dark components |
| title_full |
Unified model of baryonic matter and dark components |
| title_fullStr |
Unified model of baryonic matter and dark components |
| title_full_unstemmed |
Unified model of baryonic matter and dark components |
| title_sort |
unified model of baryonic matter and dark components |
| publishDate |
2008 |
| url |
http://hdl.handle.net/20.500.12110/paper_03702693_v666_n3_p205_Chimento http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_03702693_v666_n3_p205_Chimento_oai |
| work_keys_str_mv |
AT chimentolp unifiedmodelofbaryonicmatteranddarkcomponents AT fortem unifiedmodelofbaryonicmatteranddarkcomponents |
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1766026701783957504 |