New Constraints on Spatial Variations of the Fine Structure Constant from Clusters of Galaxies
I. de Martino, C.J.A.P. Martins, H. Ebeling, D. Kocevski
TL;DR
This study uses galaxy cluster measurements to set new, tighter constraints on the possible spatial variations of the fine structure constant, improving previous limits significantly.
Contribution
It provides the first constraints on spatial variations of the fine structure constant from galaxy clusters, improving previous bounds by factors of 10 and 2.5.
Findings
Constraints on spatial variation are tighter than previous galaxy cluster results.
The method improves sensitivity over CMB power spectrum constraints.
Results do not challenge the constancy of the fine structure constant.
Abstract
We have constrained the spatial variation of the fine structure constant using multi-frequency measurements of the thermal Sunyaev-Zeldovich effect of 618 X-ray selected clusters. Although our results are not competitive with the ones from quasar absorption lines, we improved by a factor 10 and ~2.5 previous results from Cosmic Microwave Background power spectrum and from galaxy clusters, respectively.
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