18-22 September 2017
Yerevan, Armenia
Etc/GMT+4 timezone

Qualitative Investigation of the Cosmological Model in the Presence of a Conformally Coupled Scalar Field

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Yerevan, Armenia

Yerevan, Armenia

Department of Physics, Alex Manoogian str. 1, Yerevan, Armenia


Prof. Roland Avagyan


Among currently existing approaches to solve the problem of accelerated expansion of the Universe at various stages of the evolution, a special attention is paid to cosmological models in the presence of various scalar fields. In the present work we consider a model with a non-minimal interaction term ψ2R in the Lagrangian density (ψ is a scalar field, R is the scalar curvature). The latter is obtained as a result of Beckenstein transformations within the framework of the Jordan-Branse-Dicke theory. The system of gravitational equations for such a problem is represented in the form of an autonomous dynamical system, which allows us to use the method of the qualitative theory of dynamical systems. We consider a cosmological vacuum model with the equation of state P = -ε, actually, the inflationary model of evolution, as well as the recent epoch with the predominance of dust matter. As a result, a qualitative analysis of the results is carried out.

Type of contribution Talk

Primary author


Prof. Gohar Harutunyan (Yerevan State University) Anna Kotanjyan (Yerevan State University) Dr Ashot Hovsepyan (Yerevan State University)

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