Evolution of the fine-structure constant in runaway dilaton models

• Main Authors: Martins, C. J. A. P, Vielzeuf, P. E, Martinelli, M, Calabrese, E, Pandolfi, S
• Format: Journal Article
• Language: English
• Published: 17-03-2015
• Subjects: Physics - Cosmology and Nongalactic Astrophysics; Physics - General Relativity and Quantum Cosmology; Physics - High Energy Physics - Phenomenology; Physics - High Energy Physics - Theory
• DOI: 10.48550/arxiv.1503.05068

Phys. Lett. B 743 (2015) 377-382 We study the detailed evolution of the fine-structure constant $\alpha$ in
the string-inspired runaway dilaton class of models of Damour, Piazza and
Veneziano. We provide constraints on this scenario using the most recent
$\alpha$ measurements and discuss ways to distinguish it from alternative
models for varying $\alpha$. For model parameters which saturate bounds from
current observations, the redshift drift signal can differ considerably from
that of the canonical $\Lambda$CDM paradigm at high redshifts. Measurements of
this signal by the forthcoming European Extremely Large Telescope (E-ELT),
together with more sensitive $\alpha$ measurements, will thus dramatically
constrain these scenarios.