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Abstract: We use chiral perturbation theory to investigate hadronic properties instrong electric and magnetic fields. A strong-field power counting is employed,and results for pions and nucleons are obtained using Schwinger-s proper-timemethod. In the limit of weak fields, we accordingly recover the well knownone-loop chiral perturbation theory results for the electric and magneticpolarizabilities of pions and nucleons. In strong constant fields, we extendthe Gell-Mann-Oakes-Renner relation. For the case of electric fields, we findthat non-perturbative effects result in hadron decay. For sufficiently strongmagnetic fields, the chiral analysis confirms that the nucleon hierarchybecomes inverted giving rise to proton beta-decay. Properties of asymptoticexpansions are explored by considering weak field limits. In the regime wherethe perturbative expansion breaks down, the first-order term gives the bestagreement with the non perturbative result.



Autor: Brian C. Tiburzi

Fuente: https://arxiv.org/



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