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Constraint on a varying proton-electron mass ratio 1.5 billion years after the big bang

J Bagdonaite1, W Ubachs1, M T Murphy2

  • 1Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.

Physical Review Letters
|March 13, 2015
PubMed

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