Renat Abbyazov - Academia.edu (original) (raw)

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Papers by Renat Abbyazov

Research paper thumbnail of Thermodynamics of cosmological models with a variable matter equation of state

Gravitation and Cosmology, 2010

We consider cosmological models with a self-interacting scalar field and a perfect fluid with a v... more We consider cosmological models with a self-interacting scalar field and a perfect fluid with a variable equation of state in spatially flat Friedmann-Robertson-Walker space-times. The main purpose of the paper is a study of general thermodynamic properties of such models and their relationship with the dynamics of geometry.

Research paper thumbnail of σCDM coupled to radiation: Dark energy and Universe acceleration

Modern Physics Letters A, 2015

Research paper thumbnail of $ sigma$CDM coupled to radiation. Dark energy and Universe acceleration

Recently the Chiral Cosmological Model (CCM) coupled to cold dark matter (CDM) has been investiga... more Recently the Chiral Cosmological Model (CCM) coupled to cold dark matter (CDM) has been investigated as σCDM model to study the observed accelerated expansion of the Universe. Dark sector fields (as Dark Energy content) coupled to cosmic dust were considered as the source of Einstein gravity in Friedmann-Robertson-Walker (FRW) cosmology. Such model had a beginning at the matter-dominated era. The purposes of our present investigation are two folds: to extend «life» of the σCDM for earlier times to radiation-dominated era and to take into account variation of the exponential potential V = V 0 exp − √ λ ϕ M P

Research paper thumbnail of Interaction of chiral fields of the dark sector with cold dark matter

ABSTRACT We study models containing matter in the form of dust and the fields of a two-component ... more ABSTRACT We study models containing matter in the form of dust and the fields of a two-component nonlinear sigma model describing dark energy. We consider the background and perturbation equations for the suggested models and compare them with the ΛCDM model.

Research paper thumbnail of Unified dark matter and dark energy description in a chiral cosmological model

We show the way of dark matter and dark energy presentation via ansatzs on the kinetic energies o... more We show the way of dark matter and dark energy presentation via ansatzs on the kinetic energies of the fields in the two-component chiral cosmological model. To connect a kinetic interaction of dark matter and dark energy with observational data the reconstruction procedure for the chiral metric component h22h_{22}h22 and the potential of (self)interaction VVV has been developed. The reconstruction of h22h_{22}h22 and VVV for the early and later inflation have been performed. The proposed model is confronted to LambdaCDM\Lambda CDMLambdaCDM model as well.

Research paper thumbnail of Thermodynamics of cosmological models with a variable matter equation of state

Gravitation and Cosmology, 2010

We consider cosmological models with a self-interacting scalar field and a perfect fluid with a v... more We consider cosmological models with a self-interacting scalar field and a perfect fluid with a variable equation of state in spatially flat Friedmann-Robertson-Walker space-times. The main purpose of the paper is a study of general thermodynamic properties of such models and their relationship with the dynamics of geometry.

Research paper thumbnail of σCDM coupled to radiation: Dark energy and Universe acceleration

Modern Physics Letters A, 2015

Research paper thumbnail of $ sigma$CDM coupled to radiation. Dark energy and Universe acceleration

Recently the Chiral Cosmological Model (CCM) coupled to cold dark matter (CDM) has been investiga... more Recently the Chiral Cosmological Model (CCM) coupled to cold dark matter (CDM) has been investigated as σCDM model to study the observed accelerated expansion of the Universe. Dark sector fields (as Dark Energy content) coupled to cosmic dust were considered as the source of Einstein gravity in Friedmann-Robertson-Walker (FRW) cosmology. Such model had a beginning at the matter-dominated era. The purposes of our present investigation are two folds: to extend «life» of the σCDM for earlier times to radiation-dominated era and to take into account variation of the exponential potential V = V 0 exp − √ λ ϕ M P

Research paper thumbnail of Interaction of chiral fields of the dark sector with cold dark matter

ABSTRACT We study models containing matter in the form of dust and the fields of a two-component ... more ABSTRACT We study models containing matter in the form of dust and the fields of a two-component nonlinear sigma model describing dark energy. We consider the background and perturbation equations for the suggested models and compare them with the ΛCDM model.

Research paper thumbnail of Unified dark matter and dark energy description in a chiral cosmological model

We show the way of dark matter and dark energy presentation via ansatzs on the kinetic energies o... more We show the way of dark matter and dark energy presentation via ansatzs on the kinetic energies of the fields in the two-component chiral cosmological model. To connect a kinetic interaction of dark matter and dark energy with observational data the reconstruction procedure for the chiral metric component h22h_{22}h22 and the potential of (self)interaction VVV has been developed. The reconstruction of h22h_{22}h22 and VVV for the early and later inflation have been performed. The proposed model is confronted to LambdaCDM\Lambda CDMLambdaCDM model as well.

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