Time-varying Quark Masses and Cosmological Axion Energy
S. M. Barr, Bumseok Kyae
Abstract
The possibility is examined that the masses of the light quarks u and d have varied over the course of the universe's evolution. Such a variation would have an effect on axion cosmology, and can be the basis of a solution of the so-called axion energy problem. If this is the case, a scalar force somewhat weaker than gravity could exist that has a range of order 1 km.
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