Жарияланымдар / Публикации

Постоянный URI для этого сообществаhttps://cris.qyzpu.edu.kz/handle/123456789/2

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2021 - 20232

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    Тип записи:Публикация,
    gravity with scalar field viscous fluid
    (IOP Publishing, 2021-01-01)
    Shynaray Myrzakul
    ;
    M. N. Imankul
    ;
    M Arzimbetova
    ;
    Tolkynay Myrzakul
    Abstract We focus on a viable teleparallel cosmological model with a scalar field in a flat Friedman-Robertson-Walker universe. The Lagrangian and equations of motion are obtained. The case of an inhomogeneous viscous dark energy is considered and the cosmological parameters associated with the viscosity parameter are determined. It is shown that when considering constant viscosity and state parameter, the Universe expands exponentially
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    Stability Properties of Geometrothermodynamic Cosmological Models
    (Multidisciplinary Digital Publishing Institute, 2023-09-28)
    Nurzada Beissen
    ;
    Medeu Abishev
    ;
    Manas Khassanov
    ;
    Temirbolat Aitassov
    ;
    Sagira Mamatova
    We consider a particular isotropic and homogeneous cosmological model, in which the equation of state is obtained from a thermodynamic fundamental equation by using the formalism of geometrothermodynamics (GTD). The model depends effectively on three arbitrary constants, which can be fixed to reproduce the main aspects of the inflationary era and the ΛCDM paradigm. We use GTD to analyze the geometric properties of the corresponding equilibrium space and to derive the stability properties and phase transition structure of the cosmological model.
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