Magnetic permeability in constrained fermionic vacuum

M. V. Cougo-Pinto, C. Farina, A. Tort, J. Rafelski

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We obtain using Schwinger's proper time approach the Casimir-Euler-Heisenberg effective action of fermion fluctuations for the case of an applied magnetic field. We implement here the compactification of one space dimension into a circle through anti-periodic boundary condition. Aside of higher order non-linear field effects we identify a novel contribution to the vacuum permeability. These contributions are exceedingly small for normal electromagnetism due to the smallness of the electron Compton wavelength compared to the size of the compactified dimension, if we take the latter as the typical size of laboratory cavities, but their presence is thought provoking, also considering the context of strong interactions.

Original languageEnglish (US)
Pages (from-to)388-395
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - Aug 27 1998

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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