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We calculate the rate for pair production of light pseudoscalars by stronginhomogeneous and static electric (magnetic) fields. We show that, in the caseof axions, the stability of atoms over cosmic lifetimes is jeopardised unlessthe Peccei-Quinn symmetry breaking scale $f_a$ is larger than ${\cal O}(10^{10} GeV)$.Comment: 4 pages, 3 figures, LaTe

Pair production of light pseudoscalar particles in strong inhomogeneous fields by the Schwinger mechanism