540 citations · 1.1k across the 20 of their papers we have counts for
9 papers · 1 filter
A Friendly Phantom: Late-time AdS-to-dS transition and cosmological tensions
Özgür Akarsu, Leandros Perivolaropoulos, A. Emrah Yükselci +1
We present Ph-CDM, a phantom-scalar realization within General Relativity of the sign-switching cosmological-constant idea, CDM, in which a phantom scalar evo…
Updated Constraints on Omnipotent Dark Energy: A Comprehensive Analysis with CMB and BAO Data
Enrico Specogna, Shahnawaz A. Adil, Emre Ozulker +4
In this work, we present updated observational constraints on the parameter space of the DMS20 dark energy model, a member of the omnipotent dark energy (ODE) class. Our analysis c…
- inflation: Sourced by energy-momentum squared gravity
Seyed Ali Hosseini Mansoori, Fereshteh Felegary, Mahmood Roshan +2
In this paper, we examine chaotic inflation within the context of the energy-momentum squared gravity (EMSG) focusing on the energy-momentum powered gravity (EMPG) that incorporate…
Cosmological models in scale-independent energy-momentum squared gravity
Ozgur Akarsu, N. Merve Uzun
Scale-independent EMSG is a particular model of energy-momentum squared gravity (EMSG) in which the new terms in the Einstein field equations arising from the EMSG theory enter wit…
CDM cosmology with a quiescent anisotropy in a higher dimensional steady state universe
Ozgur Akarsu, Tekin Dereli, Nihan Katirci
In this work, which follows a series of studies on the higher-dimensional steady state universe idea and prepared for Professor Tekin Dereli's Festschrift, we show the influence of…
Cosmological implications of scale-independent energy-momentum squared gravity: Pseudo nonminimal interactions in dark matter and relativistic relics
Ozgur Akarsu, Nihan Katirci, Suresh Kumar +2
In this paper, we introduce a scale-independent energy-momentum squared gravity (EMSG) that allows different gravitational couplings for different types of sources, which may lead…
Black branes and black strings in the astrophysical and cosmological context
Ozgur Akarsu, Alexey Chopovsky, Alexander Zhuk
We consider Kaluza-Klein models where internal spaces are compact flat or curved Einstein spaces. This background is perturbed by a compact gravitating body with the dust-like equa…
Brane world models with bulk perfect fluid and broken 4D Poincare invariance
Ozgur Akarsu, Alexey Chopovsky, Maxim Eingorn +2
We consider 5D brane world models with broken global 4D Poincar\a'{e} invariance (4D part of the spacetime metric is not conformal to the Minkowski spacetime). The bulk is filled w…
Late Time Acceleration of the 3-Space in a Higher Dimensional Steady State Universe in Dilaton Gravity
Ozgur Akarsu, Tekin Dereli
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-intera…