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physics.plasm-ph2025
Modified vacuum polarization in the presence of a plasma
Sebastian Lundström, Philip Semrén, Haidar Al-Naseri +1
We study vacuum polarization due to strong fields, in the presence of an electron-positron plasma. For this purpose, we expand quantum kinetic equations using weak fields and slow…
hep-th2025
Worldline instantons for nonperturbative particle production by space and time dependent gravitational fields
Philip Semrén, Greger Torgrimsson
We develop a worldline-instanton approach for calculating the momentum spectrum of particles produced by gravitational fields which depend on both space and time. The instantons ar…