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Title:
Extended quintessence and the primordial helium abundance
Authors:
Chen, Xuelei; Scherrer, Robert J.; Steigman, Gary
Affiliation:
AA(Department of Physics, The Ohio State University, Columbus, Ohio 43210), AB(Department of Physics, The Ohio State University, Columbus, Ohio 43210), AC(Department of Physics, The Ohio State University, Columbus, Ohio 43210)
Publication:
Physical Review D, vol. 63, Issue 12, id. 123504 (PhRvD Homepage)
Publication Date:
06/2001
Origin:
APS
DOI:
10.1103/PhysRevD.63.123504
Bibliographic Code:
2001PhRvD..63l3504C

Abstract

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 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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