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SUMMARY:Fluid dynamics for neutron star mergers: variations\, simulations 
 and fluctuations  - Professor Nils Andersson\, University of Southampton
DTSTART:20230614T130000Z
DTEND:20230614T140000Z
UID:TALK201253@talks.cam.ac.uk
CONTACT:Isobel Romero-Shaw
DESCRIPTION:Neutron star mergers are cosmic laboratories of (not particula
 rly well understood) physics. The modelling requires large scale simulatio
 n of extremely hot and dense matter\, likely far away from equilibrium con
 ditions. The live spacetime of general relativity is an absolute requireme
 nt\, as is an understanding of fluid dynamics beyond the textbook level. F
 raming the discussion in the context of state-of-the-art merger simulation
 s and the need to understand the fine print of the associated gravitationa
 l-wave signals for the Einstein Telescope and Cosmic Explorer\, I will con
 nect a robust approach to modelling relativistic fluids (based on a variat
 ional principle) with progress in understanding out-of-equilibrium aspects
  (like bulk viscosity). I will also outline how we hope to deal with turbu
 lence and small-scale fluctuations\, tricky problems for everyday fluids b
 ut particularly so in general relativity.  
LOCATION:Both in-person (MR2\, DAMTP) and online (details to be sent by em
 ail)
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