Magnetars as Laboratories for Strong Field QED

Chul Min Kim (IBS; CoReLS; GIST); Sang Pyo Kim (Kunsan Natl U.)

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Magnetars as Laboratories for Strong Field QED

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arxiv 2112.02460 v1 pith:24TDQXBJ submitted 2021-12-05 astro-ph.HE hep-ph

Chul Min Kim (IBS , CoReLS , GIST) , Sang Pyo Kim (Kunsan Natl U.) This is my paper · ORCID

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keywords fieldvacuumelectricmagnetarsstrongbirefringencemagneticpairs

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A strong electromagnetic field polarizes the vacuum and in the presence of an electric field creates pairs of a charged particle and its anti-particle. Magnetars, highly magnetized neutron stars with magnetic field comparable to or greater than the Schwinger field, give a significant amount of the vacuum polarization and vacuum birefringence and the induced electric field can create the electron-positron pairs, which are strong field quantum electrodynamics (QED) processes. In this paper, we use a closed formula for the one-loop effective action in the presence of a supercritical magnetic field and a subcritical electric field, find the vacuum birefringence analytically and numerically, and then discuss possible measurements in magnetars.

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