Yazar "Sahoo, Pradyumn Kumar" seçeneğine göre listele

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    Öğe
    Relationship between magnetic field and anisotropy parameter in gravitation theories
    (World Scientific Publ Co Pte Ltd, 2018) Aktaş, Can; Aygün, Sezgin; Sahoo, Pradyumn Kumar
    The magnetized strange quark matter (MSQM) solutions are obtained for a Marder type universe using constant deceleration parameter. The exact solutions of field equations are obtained for f(R,T) = R 2f(T) model given by [T. Harko et al., Phys. Rev. D 84, 024020 (2011)] with cosmological term. Also, we have obtained General Relativity (GR) solutions for MSQM distributions. For t -> infinity, we get the dark energy model, i.e. p -> -B-c, rho -> B-c and omega = -1. However, for t -> infinity, we find the cosmological constant A as negative in f (R, T) theory and GR. These results agree with [S. Aygun et al., Astrophys. Space Sci. 361, 380 (2016); C. Aktas and S. Aygun, Chinese T. Phys. 55, 71 (2017); P. K. Sahoo et al., Mod. Phys. Lett. A 32, 1750105 (2017)] in f(R,T) theory. The physical consequences of our obtained models are discussed at the end.
  • Küçük Resim
    Öğe
    Scalar Field Cosmology in f(R,T) Gravity with Λ
    (Pleiades Publishing, 2018) Aygün, Sezgin; Aktaş, Can; Sahoo, Pradyumn Kumar; Bishi, Binaya K.
    We study the behavior of cosmological parameters, massive and massless scalar fields (normal or phantom) with a scalar potential in f(R, T) theory of gravity for a flat Friedmann-Robertson-Walker (FRW) universe. To get exact solutions to the modified field equations, we use the f(R, T) = R + 2f(T) model by Harko et al. (T. Harko et al., Phys. Rev. D 84, 024020 (2011)), where R is the Ricci scalar and T is the trace of the energy momentum tensor. Our cosmological parameter solutions agree with the recent observational data. Finally, we discuss our results with various graphics. © 2018, Pleiades Publishing, Ltd.