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Time-varying quark masses and cosmological axion energy
Phys. Rev. D 71, 055006 – Published 18 March, 2005
DOI: https://doi.org/10.1103/PhysRevD.71.055006
Abstract
The possibility is examined that the masses of the light quarks and 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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