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DTSTART;TZID=America/Chicago:20260522T160000
DTEND;TZID=America/Chicago:20260522T170000
DTSTAMP:20260522T075358Z
SUMMARY:Colloquium: Bart Ripperda: “Are We There Yet? First-principles Modeling of Multimessenger Signals in the Plasma Universe”
UID:642540@northwestern.edu
TZID:America/Chicago
DESCRIPTION:Astrophysical black holes are surrounded by accretion disks\, jets\, magnetospheres\, and coronae consisting of magnetized relativistic plasma. They produce observable multi wavelength and multi messenger signals from near the event horizon and it is currently unclear how this emission is exactly produced. The electromagnetic radiation typically has a non-thermal component\, implying a power-law distribution of emitting relativistic electrons. Magnetic reconnection and plasma turbulence are viable mechanisms to tap the large reservoir of magnetic energy in these systems and accelerate electrons to extreme energies. The accelerated electrons can then emit high-energy photons that themselves may strongly interact with the plasma\, rendering a highly nonlinear system. In some cases the electromagnetic emission is accompanied by a multi messenger signal in the form of neutrinos\, cosmic rays\, or gravitational waves. Modeling the emitting systems necessitates a combination 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 electrodynamics effects like pair creation and annihilation\, and radiation. I will present novel studies of accreting black holes and how they radiate in regions close to black hole event horizon\, using both first-principles general relativistic 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\, what kind of emission signatures are typically produced\, and what they can teach us about the nature of black holes.  Bart Ripperda\, Assistant Professor\, University of Toronto  Host: Elena Murchikova      
LOCATION:Technological Institute\, L211\, 2145 Sheridan Road\, Evanston\, IL 60208
TRANSP:OPAQUE
URL:https://planitpurple.northwestern.edu/event/642540
CREATED:20241213T060000Z
STATUS:CONFIRMED
LAST-MODIFIED:20260515T212440Z
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