5 papers
The reason peculiar velocities grow faster in general relativity than in Newtonian gravity
Erick Pastén, Christos Tsagas
An increasing number of surveys has been reporting large-scale peculiar motions with sizes and speeds in excess of those allowed by the concordance cosmological model. These are th…
Peculiar velocities in the CDM universe
Evanthia Patliaka, Christos G. Tsagas
We present a unified analysis of the linear evolution of peculiar-velocity perturbations in the distribution of pressureless matter after recombination. Our study is carried out wi…
Cosmological peculiar velocities in general relativity?
Christos G. Tsagas
Cosmological peculiar velocities have traditionally been studied within the framework of Newtonian theory. Around the turn of the century, a few quasi-Newtonian analyses appeared i…
General relativity, early galaxy formation and the JWST observations
Christos G. Tsagas
The James Webb Space Telescope has recently detected massive, fully formed, galaxies at redshifts corresponding to few hundred million years after the Big-Bang. However, our curren…
Anisotropy in Pantheon+ supernovae
Animesh Sah, Mohamed Rameez, Subir Sarkar +1
We employ Maximum Likelihood Estimators to examine the Pantheon+ catalogue of Type Ia supernovae for large scale anisotropies in the expansion rate of the Universe. The analyses ar…