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Abstract:

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.

Registro:

Documento: Artículo
Título:Unified model of baryonic matter and dark components
Autor:Chimento, L.P.; Forte, M.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires, Argentina
Año:2008
Volumen:666
Número:3
Página de inicio:205
Página de fin:211
DOI: http://dx.doi.org/10.1016/j.physletb.2008.07.064
Título revista:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Título revista abreviado:Phys Lett Sect B Nucl Elem Part High-Energy Phys
ISSN:03702693
CODEN:PYLBA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_03702693_v666_n3_p205_Chimento.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v666_n3_p205_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Forte, M. (2008) . Unified model of baryonic matter and dark components. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 666(3), 205-211.
http://dx.doi.org/10.1016/j.physletb.2008.07.064
---------- CHICAGO ----------
Chimento, L.P., Forte, M. "Unified model of baryonic matter and dark components" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 666, no. 3 (2008) : 205-211.
http://dx.doi.org/10.1016/j.physletb.2008.07.064
---------- MLA ----------
Chimento, L.P., Forte, M. "Unified model of baryonic matter and dark components" . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 666, no. 3, 2008, pp. 205-211.
http://dx.doi.org/10.1016/j.physletb.2008.07.064
---------- VANCOUVER ----------
Chimento, L.P., Forte, M. Unified model of baryonic matter and dark components. Phys Lett Sect B Nucl Elem Part High-Energy Phys. 2008;666(3):205-211.
http://dx.doi.org/10.1016/j.physletb.2008.07.064