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Constraints on a possible variation of t...
Holanda, R. F. L....

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Constraints on a possible variation of the fine structure constant from galaxy cluster data by Holanda, R. F. L. ( Author )
Lemonjar Open Access
N.A
25-10-2015
We propose a new method to probe a possible time evolution of the fine structure constant α from X-ray and Sunyaev-Zeldovich measurements of the gas mass fraction (fgas) in galaxy clusters. Taking into account a direct relation between variations of α and violations of the distance-duality relation, we discuss constraints on α for a class of dilaton runaway models. Although not yet competitive with bounds from high-z quasar absorption systems, our constraints, considering a sample of 29 measurements of fgas, in the redshift interval 0.14<z<0.89, provide an independent estimate of α variation at low and intermediate redshifts. Furthermore, current and planned surveys will provide a larger amount of data and thus allow to improve the limits on α variation obtained in the present analysis.
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English
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MYR 0.00
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https://arxiv.org/abs/1510.07240
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