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Non-electromagnetic emissions from high energy particles in extremeenvironments has been studied in the literature by using several variations ofthe semi-classical formalism. The detailed mechanisms behind such emissions areof great astrophysical interest since they can alter appreciably the associatedenergy loss rates. Here, we review the role played by the source properacceleration $a$ in the particle production process. The acceleration $a$determines the typical scale characterizing the particle production and,moreover, if the massive particle production is inertially forbidden, it willbe strongly suppressed for $a$ below a certain threshold. In particular, weshow that, for the case of accelerated protons in typical pulsarmagnetospheres, the corresponding accelerations $a$ are far below the pionproduction threshold.

Massive particle production from accelerated sources in high magnetic fields