Browsing by Author "Tretyakov P."

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  • Cosmology in modified f(R, T)-gravity 
    Tretyakov P. (2018)
    © 2018, The Author(s). In the present paper we propose a further modification of f(R, T)-gravity (where T is trace of the energy-momentum tensor) by introducing higher derivatives matter fields. We discuss stability ...
  • Deceleration versus acceleration universe in different frames of F(R) gravity 
    Bahamonde S.; Odintsov S.; Oikonomou V.; Tretyakov P. (2017)
    © 2017 The AuthorsIn this paper we study the occurrence of accelerating universe versus decelerating universe between the F(R) gravity frame (Jordan frame) and non-minimally coupled scalar field theory frame, and the ...
  • Phase space analysis of the accelerating multifluid Universe 
    Odintsov S.; Oikonomou V.; Tretyakov P. (2017)
    © 2017 American Physical Society. We study in detail the phase space of a Friedmann-Robertson-Walker universe filled with various cosmological fluids that may or may not interact. We use various expressions for the equation ...
  • Stability in higher-derivative matter fields theories 
    Tretyakov P. (2016)
    © 2016, The Author(s).We discuss possible instabilities in higher-derivative matter field theories. These theories have two free parameters β1 and β4. By using a dynamical system approach we explicitly demonstrate that for ...

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