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SUMMARY:Results from the Dark Energy Spectroscopic Instrument (DESI) year-
 one data release. - Héctor Gil-Marín (ICC\, Barcelona U.)
DTSTART:20250203T130000Z
DTEND:20250203T140000Z
UID:TALK225439@talks.cam.ac.uk
CONTACT:Thomas Colas
DESCRIPTION:DESI represents the culmination of multi-years efforts and adv
 anced spectroscopic techniques. Placed at Mayall 4-meter Telescope\, DESI 
 harnesses the power of 5\,000 robotic fiber positioners\, coupled with sta
 te-of-the-art spectrographs\, to capture the spectral signatures of millio
 ns of galaxies and quasars with unprecedented precision. DESI success is a
 lso based on the collaborative spirit of its community\, more than 400 sci
 entists over 70 institutions  in 5 continents.\n\nThis data release (DR1) 
 corresponds to the first year of observations\; it holds immense scientifi
 c promise across a multitude of fronts: from constraining cosmological par
 ameters\, mapping the expansion history of the Universe\, to the propertie
 s of dark energy\, gravity and neutrinos.\n\nIn this talk I will focus on 
 the results from the first data release of DESI based on the baryon acoust
 ic oscillations (BAO) and redshift space distortions (RSD) analyses\, and 
 their impact in cosmology. On one hand\, the BAO signal allows us to trace
  the expansion history of the universe through the last 11 billion years\;
  and on the other hand the RSD allows us to test GR at cosmological scales
  over a similar period of time. In addition if baryon density information 
 is added\, DESI can also infer the rate of expansion today\, the Hubble co
 nstant at 1% level (H0=68.56 ± 0.75) km/s/Mpc. All these results seem to 
 be in good agreement with the standard model of cosmology\, the LCDM model
 .\n When combined with external datasets such as the SuperNovae data and C
 osmic Microwave Background anisotropy observations (CMB)\, we have observe
 d in some cases interesting hints towards evolving dark energy. Furthermor
 e\, DESI data in combination with CMB is able to put constraints on the su
 m of neutrino masses reaching an upper bound of 0.071 eV at 95% confidence
  level within the LCDM model.\n
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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