Paper:	Probing Fundamental-Constant Evolution with Radio Spectroscopy
Volume:	395, Frontiers of Astrophysics: A Celebration of NRAO's 50th Anniversary
Page:	297
Authors:	Kanekar, N.
Abstract:	Spectroscopy in redshifted radio transitions allows a probe of changes in multiple fundamental constants such as the fine-structure constant α, the proton gyromagnetic ratio gp, and the electron-proton mass ratio μ ≡ me/mp. In this article, I will describe the advantages and disadvantages of such radio techniques relative to optical ones, discuss the best present techniques and results, and, finally, summarize prospects for the future.

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