8 citations · 24 across the 8 of their papers we have counts for
9 papers
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…
Nonlinear Matter Power Spectrum from relativistic -body Simulations: CDM versus CDM
Özgür Akarsu, Eleonora Di Valentino, Jiří Vyskočil +3
We present relativistic -body simulations of a CDM - sign-switching cosmological constant (CC) - scenario under general relativity and compare its nonlinear matter po…
Dynamical dark energy with AdS-to-dS and dS-to-dS transitions: Implications for the tension
Özgür Akarsu, Leandros Perivolaropoulos, Anna Tsikoundoura +2
We investigate the dynamics and cosmological implications of dark energy (DE), modeled as a scalar field with a hyperbolic tangent potential that induces a smooth shift in the effe…
A quantitative analysis of the effect of box size in N-body simulations of the matter power spectrum
Maxim Eingorn, Ezgi Yilmaz, A. Emrah Yükselci +1
We study the effect of box size on the matter power spectrum obtained via cosmological N-body simulations. Within the framework of the cosmic screening approach, we show that the r…
Numerical Approach to the Exterior Solution of Spherically Symmetric and Static Configuration in Scalar-Tensor Theories
A. Savaş Arapoğlu, Sermet Çağan, A. Emrah Yükselci
We numerically examine the exterior solution of spherically symmetric and static configuration in scalar-tensor theories by using the nonminimally coupled scalar field with zero po…
The Effect of Non-minimally Coupled Scalar Field on Gravitational Waves from First-order Vacuum Phase Transitions
A. Savaş Arapoğlu, A. Emrah Yükselci
We investigate first-order vacuum phase transitions in the presence of a non-minimally coupled scalar field starting with the coupling effect on the initial dynamics of phase trans…
Effect of peculiar velocities on the gravitational potential in cosmological models with perfect fluids
Alvina Burgazli, Valerii Shulga, A. Emrah Yükselci +1
We consider a universe filled with perfect fluid with the constant equation of state parameter . In the theory of scalar perturbations, we study the effect of peculiar velocitie…
A Neutron Star with a Strange Quark Star-like Mass-Radius Relation
A. Savaş Arapoğlu, A. Emrah Yükselci
We study the structure of spherically symmetric and static objects in the presence of a nonminimally coupled scalar field having a potential of the form . We…
Dynamical System Analysis of a Five-Dimensional Cosmological Model
A. Savaş Arapoğlu, Ezgi Canay, A. Emrah Yükselci
A five-dimensional cosmological model including a single perfect fluid is studied in the framework of dynamical system analysis. All the critical points of the system with their st…