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Autor:
Gorbunova, O. G., Timoshkin, A. V.
Publikováno v:
Published in The Casimir Effect and Cosmology, TSPU 2008, p. 161-165
The accelerating Friedmann flat universe, filled with an ideal fluid with a linear (oscillating) inhomogeneous equation of state (EoS) depending on time, is reviewed. The equations of motions are solved. It is shown that in some cases there appears a
Externí odkaz:
http://arxiv.org/abs/0903.1339
Autor:
Brevik, I., Gorbunova, O.
Analytic properties of physical quantities in the cosmic fluid such as energy density \rho(t) and Hubble parameter H(t) are investigated near the future singularity (Big Rip). Both 4D and 5D cosmologies are considered (the Randall-Sundrum II model in
Externí odkaz:
http://arxiv.org/abs/0811.1129
Autor:
Brevik, I., Gorbunova, O.
Publikováno v:
Eur.Phys.J.C56:425-428,2008
The analytic properties of the energy density rho(t) of the cosmic fluid, and the Hubble parameter H(t), are investigated near to the future singularity t=t_s assuming different forms for the equation of state. First, it is shown that the inclusion o
Externí odkaz:
http://arxiv.org/abs/0806.1399
Publikováno v:
Eur.Phys.J.C52:223-228,2007
A dark Friedman-Robertson-Walker fluid governed by a non-linear inhomogeneous equation of state is considered which can be viewed as a conveniently simple paradigm for a whole class of models which exhibit phase transitions from a non-phantom towards
Externí odkaz:
http://arxiv.org/abs/0706.2072
Publikováno v:
Eur.Phys.J.C51:179-183,2007
The four-dimensional Friedman flat universe, filled with an ideal fluid with a linear (oscillating) inhomogeneous equation of state (EoS) depending on time, is studied. The equations of motion are solved. It is shown that in some cases there appears
Externí odkaz:
http://arxiv.org/abs/gr-qc/0702089
Autor:
Gorbunova, O.
The solution of the dark energy problem in models without scalars is presented. It is shown that a late-time accelerating cosmology may be generated by an ideal fluid with some implicit equation of state.
Comment: LaTeX file 2 pages, published i
Comment: LaTeX file 2 pages, published i
Externí odkaz:
http://arxiv.org/abs/hep-th/0608043
Publikováno v:
J.Phys.A39:6627-6634,2006
The solution of dark energy problem in the models without scalars is presented. It is shown that late-time accelerating cosmology may be generated by the ideal fluid with some implicit equation of state. The universe evolution within modified Gauss-B
Externí odkaz:
http://arxiv.org/abs/hep-th/0510183
Publikováno v:
Int.J.Mod.Phys.D14:1899-1906,2005
We discuss a modified form of gravity implying that the action contains a power \alpha of the scalar curvature. Coupling with the cosmic fluid is assumed. As equation of state for the fluid, we take the simplest version where the pressure is proporti
Externí odkaz:
http://arxiv.org/abs/gr-qc/0508038
Autor:
Brevik, I., Gorbunova, O.
Publikováno v:
Gen.Rel.Grav.37:2039-2045,2005
Singularities in the dark energy universe are discussed, assuming that there is a bulk viscosity in the cosmic fluid. In particular, it is shown how the physically natural assumption of letting the bulk viscosity be proportional to the scalar expansi
Externí odkaz:
http://arxiv.org/abs/gr-qc/0504001