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SUMMARY:Exquisite clutter in the circumgalactic plasmas: crosstalk between
  macro and microphysics - Prakriti Choudhury (Oxford)
DTSTART:20260223T160000Z
DTEND:20260223T170000Z
UID:TALK242482@talks.cam.ac.uk
CONTACT:Loren E. Held
DESCRIPTION:Hot\, ionised plasmas are organised in the potential wells of 
 dark matter haloes at the largest scales in the Universe\, forming the cir
 cumgalactic medium (CGM). Macroscopic dynamics like merger of haloes\, bla
 ck-hole feedback and radiative processes of these plasmas reproduce many g
 lobal CGM properties\, broadly consistent with observations. Yet high-reso
 lution multi-wavelength (e.g.\, X-ray/UV) observations expose tensions tha
 t point to missing microphysics. In this talk\, I will argue that classica
 l transport theory - built for collisional\, weakly magnetised plasmas - o
 ften breaks down in the CGM\, which is weakly collisional and threaded by 
 dynamically important\, albeit energetically weak\, magnetic fields. Such 
 magnetic fields enhance the susceptibility to electromagnetic instabilitie
 s at microphysical scales (e.g.\, mirror\, firehose and whistler). These\,
  in turn\, regulate the effective conductivity/viscosity and alter the mac
 roscopic energy and momentum fluxes which may have profound consequences i
 n the galaxy formation and interpretation of astronomical observations. I 
 will present our novel approach to model micro-macro crosstalk and new phy
 sical insights on transport processes that we have recently uncovered. Bey
 ond circumgalactic plasmas\, these considerations have interdisciplinary a
 pplications - in the hot plasmas near black holes\, laboratory plasmas\, a
 nd inertial confinement fusion.
LOCATION:MR14 DAMTP and online
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