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Centro de Astrofísica da Universidade do Porto

Evolution of the fine-structure constant in runaway dilaton models

C. J. A. P. Martins, P. E. Vielzeuf, M. Martinelli, E. Calabrese, S. Pandolfi

Abstract
We study the detailed evolution of the fine-structure constant α in the string-inspired runaway dilaton class of models of Damour, Piazza and Veneziano. We provide constraints on this scenario using the most recent α measurements and discuss ways to distinguish it from alternative models for varying α. For model parameters which saturate bounds from current observations, the redshift drift signal can differ considerably from that of the canonical ΛCDM paradigm at high redshifts. Measurements of this signal by the forthcoming European Extremely Large Telescope (E-ELT), together with more sensitive α measurements, will thus dramatically constrain these scenarios.

Keywords
Cosmology, Dynamical dark energy, Fine-structure constant, Astrophysical observations

Physics Letters B
Volume 743, Page 377
April 2015

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