929 citations · 7.2k across the 116 of their papers we have counts for
116 papers
The density of virialized clusters as a probe of dark energy
Evangelos A. Paraskevas, Leandros Perivolaropoulos
We use the spherical collapse model to demonstrate that the observable average density of virialized clusters depends on the properties of dark energy along with the properties of…
Effects of a Late Gravitational Transition on Gravitational Waves and Anticipated Constraints
Evangelos Achilleas Paraskevas, Leandros Perivolaropoulos
We investigate the evolution of gravitational waves through discontinuous evolution (transition) of the Hubble expansion rate at a sudden cosmological singularity, which may…
On the isotropy of SnIa absolute magnitudes in the Pantheon+ and SH0ES samples
Leandros Perivolaropoulos
We use the hemisphere comparison method to test the isotropy of the SnIa absolute magnitudes of the Pantheon+ and SH0ES samples in various redshift/distance bins. We compare the id…
Probing dark fluids and modified gravity with gravitational lensing
L. Perivolaropoulos, I. Antoniou, D. Papadopoulos
We generalize the Rindler-Ishak (2007) result for the lensing deflection angle in a SdS spacetime, to the case of a general spherically symmetric fluid beyond the cosmological cons…
On the homogeneity of SnIa absolute magnitude in the Pantheon+ sample
Leandros Perivolaropoulos, Foteini Skara
We have analysed the Pantheon+ sample using a new likelihood model that replaces the single SnIa absolute magnitude parameter used in the standard likelihood model of Brout et.…
A reanalysis of the latest SH0ES data for : Effects of new degrees of freedom on the Hubble tension
Leandros Perivolaropoulos, Foteini Skara
We reanalyze the recently released SH0ES data for the determination of . We focus on testing the homogeneity of the Cepheid+SnIa sample and the robustness of the results in th…