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SUMMARY:Jet structure and variability studies of GRBs with 3D GRMHD simula
 tions of magnetically arrested disks
DTSTART;VALUE=DATE-TIME:20220920T145000Z
DTEND;VALUE=DATE-TIME:20220920T151000Z
DTSTAMP;VALUE=DATE-TIME:20260414T160737Z
UID:indico-contribution-898@events.ncbj.gov.pl
DESCRIPTION:Speakers: Bestin James ( Center for Theoretical Physics PAS )\
 nWe study the structure and temporal variabilty properties of the GRB jets
  considering a magnetically arrested disk as their central engine. We nume
 rically evolve the accretion disk around a Kerr black hole using 3D genera
 l relativistic magnetohydrodynamic simulations. We consider two analytical
  equillibrium disk configurations\, the Fishbone-Moncrief and Chakrabarti 
 solutions\, as the initial conditions and impose poloidal magnetic fields 
 upon them. The disk starts accreting due to the development of the magneto
 rotational instability and eventually develops to a magnetically arrested 
 accretion disk state. We consider these models as central engines of short
  and long-GRBs\, based on our initial conditions\, and investigate the pro
 perties of the jets launched from these models. Our models self-consistent
 ly produce structured jets with a hollow core up to ~ 5 degrees. The jets 
 from our simulations have an opening angle up to ~ 11 degrees for the long
 -GRB model and up to ~ 25 degrees for the short-GRB model. We also do the 
 time variabilty studies of the jets and provide an estimate of their minim
 um variabilty timescales. Our models can be applied to the GRB jets in the
  binary neutron star post-merger system or to the ultra-relativistic jets 
 launched from collapsing stars.\n\nhttps://events.ncbj.gov.pl/event/152/co
 ntributions/898/
LOCATION:Banach Center IMPAN 321
URL:https://events.ncbj.gov.pl/event/152/contributions/898/
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