358 citations · 3.7k across the 79 of their papers we have counts for
80 papers
Large-scale peculiar velocities in the universe
Christos G. Tsagas, Leandros Perivolaropoulos, Kerkyra Asvesta
Observations have repeatedly confirmed the presence of large-scale peculiar motions in the universe, commonly referred to as ``bulk flows''. These are vast regions of the observabl…
Cosmic deceptions due to peculiar motions
Christos G. Tsagas
Relative motions have long been known to mislead the unsuspecting observers to false interpretations of reality. The deceptions are usually brief and unimportant, though relative m…
The deceleration parameter in perturbed Bianchi universes with a peculiar-velocity "tilt"
Amalia Tzartinoglou, Christos G. Tsagas
Bianchi cosmologies are ``natural'' anisotropic extensions of the Friedmann universes and they have long been used to investigate the cosmological implications of anisotropy. The l…
Peculiar velocities in Friedmann universes with nonzero spatial curvature
Eleftheria P. Miliou, Christos G. Tsagas
We extend the earlier linear studies of cosmological peculiar velocities to Friedmann universes with nonzero spatial curvature. In the process, we also compare our results with tho…
General relativity and the bulk-flow puzzle
Christos G. Tsagas
Bulk peculiar flows are commonplace in the universe, with many surveys reporting their presence on scales spanning between few hundred and several hundred Mpc. However, the sizes a…
Peculiar velocities in the early universe
Myrto Maglara, Christos G. Tsagas
Large-scale peculiar motions are commonplace in our universe. Nevertheless, their origin, evolution and implications are still largely unknown. It is generally assumed that bulk mo…