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Generalized models of unification of dark matter and dark energy

Čaplar, Neven; Štefančić, Hrvoje (2013) Generalized models of unification of dark matter and dark energy. Physical Review D, 87 (2). 023510-1. ISSN 1550-7998

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Abstract

A model of unification of dark matter and dark energy based on the modeling of the speed of sound as a function of the parameter of the equation of state is introduced. It is found that the model in which the speed of sound depends on the power of the parameter of the equation of state, c_s^2 = α(−w)^γ , contains the generalized Chaplygin gas models as its subclass. An effective scalar field description of the model is obtained in a parametric form which in some cases can be translated into a closed form solution for the scalar field potential. A constraint on model parameters is obtained using the observational data on the Hubble parameter at different redshifts.

Item Type: Article
Uncontrolled Keywords: dark energy; dark matter; unification; cosmology
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Theoretical Physics Division
Projects:
Project titleProject leaderProject codeProject type
Fundamentalne interakcije u fizici elementarnih čestica i kozmologiji[3635] Bilić, Nevenko098-0982930-2864MZOS
Depositing User: Hrvoje Štefančić
Date Deposited: 03 Apr 2013 14:51
Last Modified: 28 Jan 2014 14:35
URI: http://fulir.irb.hr/id/eprint/506
DOI: 10.1103/PhysRevD.87.023510

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