Effective Lagrangian for axion emission from SN 1987A

Abstract
We study issues connected to the emission of axions from SN 1987A. For these purposes we construct an effective Lagrangian to describe the interaction of axions with nucleons and analyze, particularly, the relevance of its dimension-6 axion-pion-nucleon interaction terms. We find that these terms do not contribute, in the nonrelativistic limit appropriate to axion emission from SN 1987A, thereby reconfirming various extant calculations.

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