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Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints

- Ozgur Akarsu, Suresh Kumar, R. Myrzakulov, M. Sami, Lixin Xu
- Physics
- 18 July 2013

In this paper, we consider a simple form of expansion history of Universe referred to as the hybrid expansion law - a product of power-law and exponential type of functions. The ansatz by… Expand

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

- Ozgur Akarsu, N. Katırcı, Suresh Kumar
- Physics
- 7 September 2017

We propose a modified theory of gravitation constructed by the addition of the term $f(T_{\mu\nu}T^{\mu\nu})$ to the Einstein-Hilbert action, and elaborate a particular case… Expand

Cosmological implications of scale-independent energy-momentum squared gravity: Pseudo nonminimal interactions in dark matter and relativistic relics

- Ozgur Akarsu, N. Katırcı, Suresh Kumar, Rafael C. Nunes, M. Sami
- PhysicsPhysical Review D
- 2 July 2018

In this paper, we introduce a scale-independent energy-momentum squared gravity (EMSG) that allows different gravitational couplings for different type of sources, which may lead to scenarios with… Expand

Late time acceleration of the 3-space in a higher dimensional steady state universe in dilaton gravity

- Ozgur Akarsu, T. Dereli
- Physics
- 30 October 2012

We present cosmological solutions for (1+3+n)-dimensional steady state universe in dilaton gravity with an arbitrary dilaton coupling constant w and exponential dilaton self-interaction potentials in… Expand

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

- M. Adak, Ozgur Akarsu, T. Dereli, O. Sert
- Geology
- 10 November 2016

We consider the non-minimal model of gravity in $Y(R) F^2$-form. We investigate a particular case of the model, for which the higher order derivatives are eliminated but the scalar curvature $R$ is… Expand

Constraint on energy-momentum squared gravity from neutron stars and its cosmological implications

- Ozgur Akarsu, J. Barrow, S. cCikintouglu, K. Ekcsi, N. Katırcı
- PhysicsPhysical Review D
- 6 February 2018

Deviations from the predictions of general relativity due to energy-momentum squared gravity (EMSG) are expected to become pronounced in the high density cores of neutron stars. We derive the… Expand

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

- Ozgur Akarsu, T. Dereli, Neslihan Oflaz
- Physics
- 11 November 2013

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… Expand

Accelerated Expansion of the Universe in a Higher Dimensional Modified Gravity with Euler-Poincar\'e Terms

- Ozgur Akarsu, T. Dereli, Neslihan Oflaz
- Physics
- 29 July 2015

A higher dimensional modified gravity theory with an action that includes dimensionally continued Euler-Poincare forms up to second order in curvatures is considered. The variational field equations… Expand

A divergence-free parametrization for dynamical dark energy

- Ozgur Akarsu, T. Dereli, J. Vázquez
- Physics
- 29 January 2015

We introduce a new parametrization for the dark energy, led by the same idea to the linear expansion of the equation of state in scale factor $a$ and in redshift $z$, which diverges neither in the… Expand

Black branes and black strings in the astrophysical and cosmological context

- Ozgur Akarsu, Alexey Chopovsky, A. Zhuk
- Physics
- 22 November 2017

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