Mathematics – Logic
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pgrp.work..235g&link_type=abstract
Japan-France Seminar on Primeval Galaxies and Related Problems, p. 235 - 246
Mathematics
Logic
Scientific paper
The author reviews the present status of the deep surveys which give faint galaxy counts, and redshift and colour distributions. These data are important steps on the way to estimate the contribution of high-redshift and primeval galaxies to the extragalactic background light. The author summarizes the modelling of these data taking into account the evolution of galaxies, and shows how it is possible to get some information on the value of the deceleration parameter q0. The straightforward interpretation of the data with simple scenarios of galaxy evolution (under the assumption of conservation of the comoving number density) gives Ω0 = 2q0 ≅ 0.1 (if the cosmological constant λ0 vanishes). Such a result is inconsistent with the flat universe predicted by the inflationary paradigm. If one does not believe in a non-zero cosmological constant, one must relax the assumption of galaxy-number conservation in order to save the flat universe. The author gives constraints on the amount of number evolution (and related mass evolution) which can fit the data in an Ω0 = 2q0 = 1 universe.
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