Extended quintessence and the primordial helium abundance

Details Extended quintessence and the primordial helium abundance Extended quintessence and the primordial helium abundance

2000-11-28

arxiv.org/abs/astro-ph/0011531v2

Phys.Rev. D63 (2001) 123504

Astronomy and Astrophysics

Astrophysics

7 pages, 10 figures. Replaced with published version (minor corrections)

Scientific paper

10.1103/PhysRevD.63.123504

In extended quintessence models, a scalar field which couples to the curvature scalar R provides most of the energy density of the universe. We point out that such models can also lead naturally to a decrease in the primordial abundance of helium-4, relieving the tension which currently exists between the primordial helium-4 abundance inferred from observations and the amount predicted by Standard Big Bang Nucleosynthesis (SBBN) corresponding to the observed deuterium abundance. Using negative power-law potentials for the quintessence field, we determine the range of model parameters which can lead to an interesting reduction in the helium-4 abundance, and we show that it overlaps with the region allowed by other constraints on extended quintessence models.

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