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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v666_n3_p205_Chimento |
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paperaa:paper_03702693_v666_n3_p205_Chimento2023-06-12T16:47:53Z Unified model of baryonic matter and dark components Phys Lett Sect B Nucl Elem Part High-Energy Phys 2008;666(3):205-211 Chimento, L.P. Forte, M. 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. 2008 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v666_n3_p205_Chimento |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| language |
Inglés |
| orig_language_str_mv |
eng |
| 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 |
| work_keys_str_mv |
AT chimentolp unifiedmodelofbaryonicmatteranddarkcomponents AT fortem unifiedmodelofbaryonicmatteranddarkcomponents |
| _version_ |
1769810032947363840 |