The kinematic component of the cosmological redshift (2009)
It is widely believed that the cosmological redshift is not a Doppler shift. However, Bunn & Hogg have recently pointed out that to settle properly this problem, one has to transport parallelly the...
In two recent papers, Abramowicz et al. claim that the expansion of the Universe can be interpreted only as the expansion of space. In fact, what they really prove is that the cosmological expansion...
The velocity-density relation in the spherical model (2008)
Bilicki, Maciej, Chodorowski, Michał
We study the cosmic velocity-density relation using the spherical collapse model (SCM) as a proxy to non-linear dynamics. Although the dependence of this relation on cosmological parameters is known...
Cosmic velocity--gravity relation in redshift space (2008)
Colombi, Stéphane, Chodorowski, Michał, Teyssier, Romain
We propose a simple way to estimate the parameter beta = Omega_m^(0.6)/b from three-dimensional galaxy surveys. Our method consists in measuring the relation between the cosmological velocity and...