Evolution of the fine-structure constant in runaway dilaton models

Autor:	Martins, C. J. A. P., Vielzeuf, P. E., Martinelli, M., Calabrese, E., Pandolfi, S.
Rok vydání:	2015
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Zdroj:	Phys. Lett. B 743 (2015) 377-382
Druh dokumentu:	Working Paper
DOI:	10.1016/j.physletb.2015.03.002
Popis:	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. Comment: 11 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1503.05068 Zobrazit plný text záznamu View this record from Arxiv