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Constraints on the light axion of Dine, Fischler, and Srednicki are critically reexamined and upper bounds on its mass are derived from stars at various stages of evolution. A conservative upper bound for the axion mass is about 1 eV, while a model-dependent argument gives a better upper bound of mass 0. 07 eV. The same argument also applies to coupling of any massless pseudoscalar particle to electrons giving an upper bound of |g₄|<110^-11.
Fukugita et al. (Fri,) studied this question.
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