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Abstract:

We describe a big brake singularity in terms of a modified Chaplygin gas equation of state p=(γm-1)ρ+αγmρ-n, accommodate this late-time event as an exotic quintessence model obtained from an energy-momentum tensor, and focus on the cosmological behavior of the exotic field, its kinetic energy, and the potential energy. At the background level the exotic field does not blow up, whereas its kinetic energy and potential both grow without limit near the future singularity. We evaluate the classical stability of this background solution by examining the scalar perturbations of the metric along with the inclusion of entropy perturbation in the perturbed pressure. Within the Newtonian gauge, the gravitational field approaches a constant near the singularity plus additional regular terms. When the perturbed exotic field is associated with α>0 the perturbed pressure and contrast density both diverge, whereas the perturbed exotic field and the divergence of the exotic field's velocity go to zero exponentially. When the perturbed exotic field is associated with α<0 the contrast density always blows up, but the perturbed pressure can remain bounded. In addition, the perturbed exotic field and the divergence of the exotic field's velocity vanish near the big brake singularity. We also briefly look at the behavior of the intrinsic entropy perturbation near the singular event. © 2016 American Physical Society.

Registro:

Documento: Artículo
Título:Big brake singularity is accommodated as an exotic quintessence field
Autor:Chimento, L.P.; Richarte, M.G.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Viamonte 430, Buenos Aires, 1053, Argentina
Departamento de Física, Facultad de Ciencias, Universidad Del Bío-Bío, Avenida Collao 1202, Casilla 5-C, Concepción, Chile
Departamento de Física, Universidade Federal Do Paraná, Caixa Postal 1904481531-990, Brazil
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, Buenos Aires, 1428, Argentina
Año:2016
Volumen:93
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevD.93.043524
Título revista:Physical Review D
Título revista abreviado:Phy. Rev. D
ISSN:24700010
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24700010_v93_n4_p_Chimento

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Citas:

---------- APA ----------
Chimento, L.P. & Richarte, M.G. (2016) . Big brake singularity is accommodated as an exotic quintessence field. Physical Review D, 93(4).
http://dx.doi.org/10.1103/PhysRevD.93.043524
---------- CHICAGO ----------
Chimento, L.P., Richarte, M.G. "Big brake singularity is accommodated as an exotic quintessence field" . Physical Review D 93, no. 4 (2016).
http://dx.doi.org/10.1103/PhysRevD.93.043524
---------- MLA ----------
Chimento, L.P., Richarte, M.G. "Big brake singularity is accommodated as an exotic quintessence field" . Physical Review D, vol. 93, no. 4, 2016.
http://dx.doi.org/10.1103/PhysRevD.93.043524
---------- VANCOUVER ----------
Chimento, L.P., Richarte, M.G. Big brake singularity is accommodated as an exotic quintessence field. Phy. Rev. D. 2016;93(4).
http://dx.doi.org/10.1103/PhysRevD.93.043524