Axion decay $a\to f\tilde{f}$ in a strong magnetic field

Abstract

The axion decay into charged fermion-antifermion pair $a\to f\tilde{f}$ is studied in external crossed and magnetic fields. The result we have obtained can be of use to re-examine the lower limit on the axion mass in case of possible existence of strong magnetic fields at the early Universe stage.

Comments: 6 pages, latex. Amended version, references added, to be published in Phys.Lett.B