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Constraining spatial variations of the fine-structure constant in symmetron models

A. M. M. Pinho, M. Martinelli, C. J. A. P. Martins

Abstract
We introduce a methodology to test models with spatial variations of the fine-structure constant a, based on the calculation of the angular power spectrum of these measurements. This methodology enables comparisons of observations and theoretical models through their predictions on the statistics of the a variation. Here we apply it to the case of symmetron models. We find no indications of deviations from the standard behavior, with current data providing an upper limit to the strength of the symmetron coupling to gravity (log beta(2) < -0.9) when this is the only free parameter, and not able to constrain the model when also the symmetry breaking scale factor assB is free to vary. (C) 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.

Keywords
Cosmology; Fundamental couplings; Fine-structure constant; Astrophysical observations

Acta Astronautica
Volume 769, Page 491
2017 June

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia