299 citations · 331 across the 8 of their papers we have counts for
8 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-dS transitions vs. Baryon Acoustic Oscillations at 2.3-2.4
Özgür Akarsu, Maxim Eingorn, Leandros Perivolaropoulos +2
In this paper, written in memory of Alexei Starobinsky, we discuss the observational viability of the Ph-CDM model - a dynamical dark energy scenario based on a phantom…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
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…
Mass density vs. energy density at cosmological scales
Maxim Eingorn, Ezgi Yilmaz, A. Emrah Yükselci +1
In the presence of the gravitational field, the energy density of matter no longer coincides with its mass density. A discrepancy exists, of course, also between the associated pow…
Effect of the spatial curvature of the Universe on the form of the gravitational potential
Maxim Eingorn, A. Emrah Yukselci, Alexander Zhuk
Within the cosmic screening approach, we obtain the exact formulas for the velocity-independent gravitational potentials produced by matter in the form of discrete sources distribu…