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SUMMARY:Olavi Kiuru (Helsinki U)\, QED Cross Sections in Strong Magnetic F
 ields (Joint Seminar with HI Jena at 14:00\, Fröbelstieg 3!)
DTSTART:20261126T130000Z
DTEND:20261126T143000Z
DTSTAMP:20261104T210100Z
UID:indico-event-544@indico.tpi.uni-jena.de
DESCRIPTION:The surface magnetic fields of magnetars\, the most strongly m
 agnetized >> neutron stars\, can reach tens of times the critical Schwing
 er field >> B_Q=4.4*10^13 G. At such field strengths\, the quantization o
 f electron and\n>> positron energies into Landau levels must be taken int
 o account in the >> particle dynamics of the system. In this talk\, I wil
 l present a >> Landau-level-based formalism for calculating QED scatterin
 g cross sections >> in a strong background magnetic field and discuss how
  the constant magnetic >> field case differs from a plane-wave background
  and vacuum QED. Most >> notably\, the introduction of Landau levels lead
 s to the cross sections >> acquiring new divergences that are not present
  in vacuum QED. These\n>> divergences have to be regulated in a quantum-f
 ield-theoretically >> consistent manner\, which requires the implementati
 on of both loop >> corrections and unstable particle states into the calc
 ulations.\n\nhttps://indico.tpi.uni-jena.de/event/544/
URL:https://indico.tpi.uni-jena.de/event/544/
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