Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-01
Phys.Rev.D70:083503,2004
Astronomy and Astrophysics
Astrophysics
26 pages, 20 eps figures
Scientific paper
10.1103/PhysRevD.70.083503
The cosmological evolution of a quintessence-like scalar field, phi, coupled to matter and gauge fields leads to effective modifications of the coupling constants and particle masses over time. We analyze a class of models where the scalar field potential V(phi) and the couplings to matter B(phi) admit common extremum in phi, as in the Damour-Polyakov ansatz. We find that even for the simplest choices of potentials and B(phi), the observational constraints on delta alpha/alpha coming from quasar absorption spectra, the Oklo phenomenon and Big Bang nucleosynthesis provide complementary constraints on the parameters of the model. We show the evolutionary history of these models in some detail and describe the effects of a varying mass for dark matter.
Lee Seokcheon
Olive Keith A.
Pospelov Maxim
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