2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43575We show, either quantum mechanically or classically, that the variation of the effective mass induced in a charged particle by the presence of an ultra-strong electromagnetic field may lead to observable consequences. In particular, we discuss how this effect may operate on electrons close to the surface of a magnetar, a neutron star with a super-strong magnetic field of the order of $10^{11}$ Tesla.4 pages, no figuresHigh Energy Physics - Phenomenologytext