Varying Fine-Structure Constant and the Cosmological Constant Problem

Details Varying Fine-Structure Constant and the Cosmological Constant Problem Varying Fine-Structure Constant and the Cosmological Constant Problem

2002-12-04

arxiv.org/abs/gr-qc/0212017v2

Astrophys.Space Sci. 283 (2003) 559-564

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Delivered at JENAM 2002, Porto, Portugal, 2-7 September, 2002; 5 pages LaTex, 3 figures; typographical errors corrected

Scientific paper

10.1023/A:1022566431460

We start with a brief account of the latest analysis of the Oklo phenomenon providing the still most stringent constraint on time-variability of the fine- structure constant $\alpha$. Comparing this with the recent result from the measurement of distant QSO's appears to indicate a non-uniform time-dependence, which we argue to be related to another recent finding of the accelerating universe. This view is implemented in terms of the scalar-tensor theory, applied specifically to the small but nonzero cosmological constant. Our detailed calculation shows that these two phenomena can be understood in terms of a common origin, a particular behavior of the scalar field, dilaton. We also sketch how this theoretical approach makes it appropriate to revisit non- Newtonian gravity featuring small violation of Weak Equivalence Principle at medium distances.

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