Non-universal scalar-tensor theories and big bang nucleosynthesis

Details Non-universal scalar-tensor theories and big bang nucleosynthesis Non-universal scalar-tensor theories and big bang nucleosynthesis

2008-11-12

arxiv.org/abs/0811.1845v1

Phys.Rev.D79:103512,2009

Astronomy and Astrophysics

Astrophysics

28 pages, 20 figures

Scientific paper

10.1103/PhysRevD.79.103512

We investigate the constraints that can be set from big-bang nucleosynthesis on two classes of models: extended quintessence and scalar-tensor theories of gravity in which the equivalence principle between standard matter and dark matter is violated. In the latter case, and for a massless dilaton with quadratic couplings, the phase space of theories is investigated. We delineate those theories where attraction toward general relativity occurs. It is shown that big-bang nucleosynthesis sets more stringent constraints than those obtained from Solar system tests.

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