Response of strongly-interacting matter to magnetic field: some exact results
arXiv:hep-ph/0510049 · doi:10.1103/PhysRevD.73.045006
Abstract
We derive some exact results concerning the response of strongly-interacting matter to external magnetic fields. Our results come from consideration of triangle anomalies in medium. First, we define an "axial magnetic susceptibility," then we examine its beahvior in two flavor QCD via response theory. In the chirally restored phase, this quantity is proportional to the fermion chemical potential, while in the phase of broken chiral symmetry it can be related, through triangle anomalies, to an in-medium amplitude for the neutral pion to decay to two photons. We confirm the latter result by calculation in a linear sigma model, where this amplitude is already known in the literature.
13 pages, no figures, To be submitted to Physical Review D, fixed an omitted reference
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