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SUMMARY:Constraining Cosmic Baryons and Dark Matter with the Lyman-alpha F
 orest - Brant Robertson (UCSC)
DTSTART:20221202T113000Z
DTEND:20221202T123000Z
UID:TALK192488@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:The filamentary network of intergalactic medium (IGM) gas that
  gives origin to the “Lyman-alpha forest” encodes information on the p
 hysics of structure formation and the early thermodynamics of diffuse bary
 onic material. I will present results from a massive suite of more than 10
 80 high-resolution cosmological hydrodynamical simulations run with the Gr
 aphics Processing Unit-accelerated code Cholla to study the IGM at high sp
 atial resolution. By varying the amplitude and timing of the photoheating 
 and photoionizing background produced by star-forming galaxies and active 
 galactic nuclei\, we can match the observed hydrogen Lyman-alpha forest po
 wer spectra and helium Lyman-alpha forest opacity. The available data tigh
 tly constrain the photoionization and photoheating history of the IGM\, an
 d allow us to infer its thermal history. We then present a new analysis va
 rying the dark matter particle mass to study the consistency between possi
 ble free-streaming suppression of the small-scale matter power spectrum an
 d the Lyman-alpha forest\, allowing us to constrain cosmological physics f
 rom the Lyman-alpha forest while robustly accounting for thermal structure
  of the IGM.
LOCATION:in person &amp\; via zoom 
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