Upper limit to $Ω_B$ in scalar-tensor gravity theories

Details Upper limit to $Ω_B$ in scalar-tensor gravity theories Upper limit to $Ω_B$ in scalar-tensor gravity theories

1997-04-25

arxiv.org/abs/astro-ph/9704254v1

Astronomy and Astrophysics

Astrophysics

uuencoded tar-file containing 16 pages, latex with 5 figures, accepted for publication in Astrophysical Journal (Part 1)

Scientific paper

10.1086/304613

In a previous paper (Serna & Alimi 1996), we have pointed out the existence of some particular scalar-tensor gravity theories able to relax the nucleosynthesis constraint on the cosmic baryonic density. In this paper, we present an exhaustive study of primordial nucleosynthesis in the framework of such theories taking into account the currently adopted observational constraints. We show that a wide class of them allows for a baryonic density very close to that needed for the universe closure. This class of theories converges soon enough towards General Relativity and, hence, is compatible with all solar-system and binary pulsar gravitational tests. In other words, we show that primordial nucleosynthesis does not always impose a very stringent bound on the baryon contribution to the density parameter.

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