Upper limit to ${\Omega }_B$ in scalar-tensor gravity theories

Abstract

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.

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

Cited by in corpus (4)

• Convergence of Scalar-Tensor theories toward General Relativity and Primordial Nucleosynthesis
• Big Bang nucleosynthesis in scalar tensor gravity: the key problem of the ${}^7$Li abundance
• Asymptotic and Exact Solutions of Perfect-Fluid Scalar-Tensor Cosmologies
• High-precision broad-band linear polarimetry of early-type binaries I. Discovery of variable, phase-locked polarization in HD 48099