Ozgur Akarsu

Accelerating anisotropic cosmologies in Brans–Dicke gravity coupled to a mass-varying vector field

The field equations of Brans–Dicke gravity coupled to a mass-varying vector field are derived. Anisotropic cosmological solutions with a locally rotationally symmetric Bianchi type I metric and time-dependent scalar and electric vector fields are studied. A particular class of exact solutions for which all the variable parameters have a power-law time dependence is given. The universe expands with a constant expansion anisotropy within this class of solutions. We show that the accelerating expansion is driven by the scalar field and the electric vector field can be interpreted as an anisotropic dark matter source.

Cosmic acceleration in a dust only universe via energy-momentum powered gravity

We propose a modified theory of gravitation constructed by the addition of the term

Anisotropic inflation with a non-minimally coupled electromagnetic field to gravity

f(T_{\mu\nu}T^{\mu\nu})

Accelerated expansion of the Universe in a higher dimensional modified gravity with Euler-Poincaré terms

to the Einstein-Hilbert action, and elaborate a particular case

Broken scale invariance, \(\alpha \) -attractors and vector impurity

f(T_{\mu\nu}T^{\mu\nu})=\alpha(T_{\mu\nu}T^{\mu\nu})^{\eta}

Energy-momentum powered gravity and cosmic acceleration

, where

Black branes and black strings in the astrophysical and cosmological context

\alpha

Scalar perturbations in cosmological f(R) models: the cosmic screening approach

and

Inflation and Late Time Acceleration Designed by Stueckelberg Massive Photon

\eta

Brane world models with bulk perfect fluid and broken 4D Poincare invariance

are real constants, dubbed as Energy Momentum Powered Gravity (EMPG). We search for viable cosmologies arising from the EMPG especially in the context of late time accelerated expansion of the Universe. We investigate the ranges of the EMPG parameters