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    Öğe
    Brans Dicke type teleparallel scalar-tensor theory
    (World Scientific Publ Co Pte Ltd, 2017) Salti, Mustafa; Aydogdu, Oktay; Yanar, Hilmi; Binbay, Figen
    The teleparallel alternative of general relativity which is based on torsion instead of curvature is considered as the gravitational sector to explore the dark universe. Inspired from the well-known Brans-Dicke gravity, here, we introduce a new proposal for the galactic dark energy effect. The new model includes a scalar field with self-interacting potential and a non-minimal coupling between the gravity and scalar field. Additionally, we analyze the idea via the Noether symmetry approach and thermodynamics.
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    Öğe
    Galactic entropy in extended Kaluza-Klein cosmology
    (World Scientific Publ Co Pte Ltd, 2016) Yanar, Hilmi; Salti, Mustafa; Aydogdu, Oktay; Acikgoz, Irfan; Yasar, Erol
    We use a Kaluza-Klein model with variable cosmological and gravitational terms to discuss the nature of galactic entropy function. For this purpose, we assume a universe filled with dark fluid and consider five-dimensional (5D) field equations using the Gamma law equation. We mainly discuss the validity of the first and generalized second laws of galactic thermodynamics for viable Kaluza-Klein models.