Bound on the time variation of the fine structure constant driven by quintessence

Details Bound on the time variation of the fine structure constant driven by quintessence Bound on the time variation of the fine structure constant driven by quintessence

2003-09-11

arxiv.org/abs/astro-ph/0309316v3

Int.J.Mod.Phys.D14:335-344,2005

Astronomy and Astrophysics

Astrophysics

4 pages (use RevTex4), 3 figures

Scientific paper

10.1142/S021827180500589X

The bound on the time variation of the fine structure constant ($\alpha$) driven by the dynamics of quintessence scalar field which is coupled to electromagnetism is discussed using phenomenological quintessential models constrained by SNIa and CMB observations. We find that those models allowing early quintessence give the largest variation $\Delta\alpha$ at the decoupling epoch. Furthermore, the fifth force experiments imply that $\Delta\alpha/\alpha$ is less than about 0.1%.

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