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A low-mass boson a, if it couples by a two-photon vertex, can be produced in the plasma decay process ₓ₋+a and in the plasma coalescence process ₓ+₋, where ₓ and ₋ are transverse and longitudinal plasmons, respectively. The previously discussed ₓₓ+a is kinematically suppressed. It is shown that a previous calculation of the Primakoff emission rate already includes these effects if T₀ (plasma frequency ₀) so that astrophysical bounds on the axion-photon coupling remain unchanged.
Georg G. Raffelt (Tue,) studied this question.
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