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Abstract:

We investigate a model of interacting dark matter and dark energy given by a modified holographic Ricci cutoff in a spatially flat Friedmann-Robertson- Walker space-time. We consider a nonlinear interaction consisting of a significant rational function of the total energy density and its first derivative homogeneous of degree one and show that the effective one-fluid obeys the equation of state of a relaxed Chaplygin gas. So that, the Universe is dominated by pressureless dark matter at early times and undergoes an accelerated expansion in the far future driven by a strong negative pressure. We apply the χ2-statistical method to the observational Hubble data and the Union2 compilation of SNe Ia for constraining the cosmological parameters and analyze the feasibility of the modified holographic Ricci cutoff. By using the new Om diagnostic method, we find that the effective model differs substantially from the Λ-CDM one, because it gets the accelerated expansion faster than the Λ-CDM model. Finally, a model with a third component decoupled from the interacting dark sector is presented for studying bounds on the dark energy at early times. © 2011 American Physical Society.

Registro:

Documento: Artículo
Título:Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas
Autor:Chimento, L.P.; Richarte, M.G.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina
Año:2011
Volumen:84
Número:12
DOI: http://dx.doi.org/10.1103/PhysRevD.84.123507
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v84_n12_p_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Richarte, M.G. (2011) . Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas. Physical Review D - Particles, Fields, Gravitation and Cosmology, 84(12).
http://dx.doi.org/10.1103/PhysRevD.84.123507
---------- CHICAGO ----------
Chimento, L.P., Richarte, M.G. "Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas" . Physical Review D - Particles, Fields, Gravitation and Cosmology 84, no. 12 (2011).
http://dx.doi.org/10.1103/PhysRevD.84.123507
---------- MLA ----------
Chimento, L.P., Richarte, M.G. "Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 84, no. 12, 2011.
http://dx.doi.org/10.1103/PhysRevD.84.123507
---------- VANCOUVER ----------
Chimento, L.P., Richarte, M.G. Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas. Phys Rev D Part Fields Gravit Cosmol. 2011;84(12).
http://dx.doi.org/10.1103/PhysRevD.84.123507