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SUMMARY:Hydrogen as a tracer of cosmic structures: fundamental physics and
  astrophysical aspects - Matteo Viel (SISSA)
DTSTART:20211115T130000Z
DTEND:20211115T140000Z
UID:TALK163006@talks.cam.ac.uk
CONTACT:James Bonifacio
DESCRIPTION:I will review the use of neutral hydrogen (HI) in the post rei
 onization era as a tracer of the structure formation process. I will focus
  on atomic hydrogen both in absorption (IGM) and in emission (21cm intensi
 ty mapping). IGM is a probe of HI in volume\, while intensity mapping is s
 ensitive to the HI mass distribution. This combined information is thus hi
 ghly complementary. The IGM\, diffuse matter between galaxies (the so-call
 ed cosmic web)\, allows to measure the matter perturbations down to small 
 scales and at high redshift. In recent years\, baryonic acoustic oscillati
 ons have been detected at high redshift and unprecedented tight constraint
 s on dark matter nature and neutrino mass have also been obtained\, using 
 IGM data (mainly from low resolution BOSS and high resolution quasar spect
 ra from HIRES/Keck). On the other hand\, emission at 21cm will probe is go
 ing to be an important probe that will also probe structure formation at h
 igh redshift. The IGM and intensity mapping can be used to address fundame
 ntal physical questions like the nature of dark matter\, neutrino masses\,
  possible extension of the standard cosmological model\, and offer importa
 nt clues on the cosmic cycle of baryons and the galaxy/IGM interplay.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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