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Fine-structure constant constraints on Bekenstein-type models

P. M. M. Leal, C. J. A. P. Martins, L. B. Ventura

Astrophysical tests of the stability of dimensionless fundamental couplings, such as the fine-structure constant α, are an area of much increased recent activity, following some indications of possible spacetime variations at the few parts per million level. Here we obtain updated constraints on the Bekenstein-Sandvik-Barrow-Magueijo model, which is arguably the simplest model allowing for α variations. Recent accurate spectroscopic measurements allow us to improve previous constraints by about an order of magnitude. We briefly comment on the dependence of the results on the data sample, as well as on the improvements expected from future facilities.

Physical Review D
Volume 90, Issue 2, Page 027305_1
2014 July

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia