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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-8971
DTSTART:20251017T203000Z
DTEND:20251017T213000Z
DTSTAMP:20260413T083857Z
LAST-MODIFIED:20251013T153828Z
LOCATION:Chamberlin 2241
SUMMARY:Are We There Yet? Modeling of Multimessenger Signals in the Pl
 asma Universe\, Physics Department Colloquium\, Bart Ripperda\, Canadi
 an Institute for Theoretical Astrophysics
DESCRIPTION:Astrophysical black holes are surrounded by accretion disk
 s\, jets\, magnetospheres\, and coronae consisting of magnetized relat
 ivistic plasma. They produce observable multi wavelength and multi mes
 senger signals from near the event horizon and it is currently unclear
  how this emission is exactly produced. Magnetic reconnection and plas
 ma turbulence are viable mechanisms to tap the large reservoir of magn
 etic energy in these systems and accelerate electrons to extreme energ
 ies. In some cases the electromagnetic emission is accompanied by a mu
 lti messenger signal in the form of neutrinos\, cosmic rays\, or gravi
 tational waves. Modeling the emitting systems necessitates a combinati
 on of magnetohydrodynamic models to capture the global dynamics of the
  formation of dissipation regions\, and a kinetic treatment of plasma 
 processes that are responsible for particle acceleration\, quantum ele
 ctrodynamics effects like pair creation and annihilation\, and radiati
 on. I will present novel studies of black holes and how they radiate i
 n regions close to black hole event horizon\, using both first-princip
 les kinetic particle-in-cell simulations and global large-scale three-
 dimensional magnetohydrodynamics models. With a combination of models\
 , I determine where and how dissipation of magnetic energy occurs\, wh
 at kind of emission signatures are typically produced\, and what they 
 can teach us about the nature of black holes.
URL:https://www.physics.wisc.edu/events/?id=8971
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