No obvious change in the number density of galaxies up to z ≈ 3.5

Abstract

The analysis of the cumulative count of sources of gamma-ray bursts as a function of their redshift strongly suggests that the number density of star-forming galaxies is roughly constant, up to z ≈ 3.5. The analysis of the cumulative count of galaxies in the Hubble Ultra Deep Field further shows that the overall number density of galaxies is constant as well, up to z ≈ 2 at least. Since ΛCDM does not seem able to cope with the age of old objects, both analyses were performed using a non-standard redshift-distance relationship