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Is it a hypothetical effect, or a well attested one? ... said: Rursus ( ^mbork³) 08:32, 6 October 2009 (UTC) reply

52 hits on http://arxiv.org/ makes it either well attested, or the cosmologers' pet theory. ... said: Rursus ( ^mbork³) 08:35, 6 October 2009 (UTC) reply

Cosmologers certainly can have pet theories, but I think this one is well attested. Here's a 1967 paper about measuring the effect of the Primakoff process: Experimental determination of the η lifetime by the measurement of the primakoff effect. Gneisss ( talk) 10:29, 17 December 2017 (UTC) reply