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BEGIN:VEVENT
DTSTAMP:20260312T142547Z
UID:https://www.ipp.mpg.de/events/44376/14160
DTSTART:20260114T093000Z
DTEND:20260114T110000Z
CLASS:PUBLIC
CREATED:20260113T085137Z
DESCRIPTION:Abstract: Gamma-ray bursts (GRBs) and active galactic nuclei (A
 GNs) launch plasma outflows moving at nearly the speed of light from their
  central engines\, and they create relativistic shock waves. Due to their 
 extreme energies\, these shocks are expected to accelerate particles via f
 irst-order Fermi acceleration\, in which particles gain energy by repeated
 ly crossing the shock front\, potentially explaining the origin of cosmic 
 rays\, especially ultra-high-energy cosmic rays.However\, whether charged 
 particles can indeed be efficiently accelerated at relativistic shocks rem
 ains under debate. A key condition for such acceleration is the presence o
 f strong magnetic turbulence around the shock\, which allows particles to 
 be scattered and cross the shock multiple times. Yet\, the physical mechan
 ism that generates such intense turbulence is still poorly understood.In t
 his study\, we investigate a scenario where turbulence is driven downstrea
 m of the shock through the interaction between the shock front and density
  fluctuations pre-existing in the upstream medium. We perform 3D relativis
 tic magnetohydrodynamic (MHD) simulations to model the turbulent structure
 \, followed by test-particle simulations to trace particle trajectories in
  the resulting fields.Our results show that strong magnetic turbulence dev
 elops in the downstream region\, where the magnetic field is amplified by 
 the turbulence through the small-scale dynamo\, leading to efficient shock
  acceleration by particle scattering.In my talk\, we will discuss the cond
 itions under which particle acceleration occurs\, the nature of accelerati
 on within magnetic turbulence\, and the properties of the generated turbul
 ence in comparison with GRB observations.\nSpeaker: Kanji Morikawa
LAST-MODIFIED:20260113T085556Z
LOCATION:IPP L7A\, Room: 121
ORGANIZER;CN=Plasma Astrophysics group (TOK):mailto:artem.bohdan@ipp.mpg.de
SUMMARY:Magnetic turbulence and particle acceleration driven by interaction
 s between relativistic shock waves and density inhomogeneity
URL;VALUE=URI:https://www.ipp.mpg.de/events/44376/14160
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