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5 papers · 2 filters
Bianchi type II models in the presence of perfect fluid and anisotropic dark energy
Suresh Kumar, Ozgur Akarsu
Spatially homogeneous but totally anisotropic and non-flat Bianchi type II cosmological model has been studied in general relativity in the presence of two minimally interacting fl…
Non-minimal -Coupled Electromagnetic Fields to Gravity and Static, Spherically Symmetric Solutions
Tekin Dereli, Özcan Sert
We investigate non-minimal -type couplings of electromagnetic fields to gravity. We derive the field equations by a first order variational principle using the method of La…
Non-minimal Couplings of Electromagnetic Fields to Gravity: Static, Spherically Symmetric Solutions
Tekin Dereli, Özcan Sert
We investigate the non-minimal couplings between the electromagnetic fields and gravity through the natural logarithm of the curvature scalar. After we give the Lagrangian formulat…
Cosmological models with linearly varying deceleration parameter
Ozgur Akarsu, Tekin Dereli
We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exac…
Non-minimally Coupled Gravitational and Electromagnetic Fields: pp-Wave Solutions
T. Dereli, O. Sert
We give the Lagrangian formulation of a generic non-minimally extended Einstein-Maxwell theory with an action that is linear in the curvature and quadratic in the electromagnetic f…