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SUMMARY:Science with Very Large Cosmological Simulations - Simeon Bird (UC
  Riverside)
DTSTART:20230317T113000Z
DTEND:20230317T123000Z
UID:TALK193705@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:I will discuss the ASTRID project\, which has run a very large
  cosmological simulation to z=1.3\, and now ~50 moderately smaller simulat
 ions to z=2. Particle loads range from 5500^3 to 1536^3 through 3072^3. AS
 TRID contains a model for black hole dynamic friction which allows us to s
 tudy AGN multiplets in more realism than before\, as well as models for hy
 drogen and helium reionization. I will discuss machine learning techniques
  for upscaling simulations and thus increasing the size of the models we a
 re able to create by another order of magnitude. I will talk about some re
 cent results enabled by ASTRID in the Lyman alpha forest\, detecting dim p
 rotoclusters using their gas absorption. The newest simulations are a suit
 e for cosmology\, which have been used to create an emulator for the Lyman
  alpha forest flux power spectrum. Together they are able to make predicti
 ons\, accurate at the percent level\, for a wide range of cosmological par
 ameters.
LOCATION:in person &amp\; via zoom 
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