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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20210909T103000
DTEND;TZID=Atlantic/Canary:20210909T113000
UID:iactalks-1485
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1485
CREATED:2021-09-09T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Cosmology with a new observable: Angular Redshift Fluctuations (ARF
 )
DESCRIPTION:Cosmology with a new observable: Angular Redshift Fluctuations 
 (ARF)\nDr. Carlos Hernández-Monteagudo\n\nIn cosmology, it is customary t
 o convert observed redshifts into distances in order to study the large sc
 ale distribution of matter probes like galaxies and quasars, and to obtain
  cosmological constraints thereof. In this talk, I describe a new approach
  which bypasses such conversion and studies the "field of redshifts" as a 
 new cosmological observable, dubbed thereafter as angular redshift fluctua
 tions (ARF). By comparing linear theory predictions to the output of N-bod
 y cosmological simulations, I will show how the ARF are actually sensitive
  to both the underlying density and radial peculiar velocity fields in the
  universe, and how one can obtain cosmological and astrophysical constrain
 ts from them. And since "the prove of the pudding is in the eating", I wil
 l demonstrate how ARF provide, under a very simple setup, competitive cons
 traints on the nature of peculiar velocities and gravity from BOSS DR13 da
 ta. Furthermore, I will also show that by combining ARF with maps of the c
 osmic microwave background (CMB), we can unveil the signature of the missi
 ng (and moving) baryons, doubling the amount of detected baryons in dispar
 ate cosmic epochs ranging from z=0 up to z=5, and providing today's most p
 recise description of the spatial distribution of baryons in the universe.
 \n 
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