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SUMMARY:Implications for dark energy and cosmology from recent DES and DES
 I results
DTSTART:20250410T113000Z
DTEND:20250410T133000Z
DTSTAMP:20260307T121900Z
UID:indico-event-5023@agenda.ciemat.es
DESCRIPTION:Speakers: Nicola Deiosso (CIEMAT)\, Santiago Ávila (CIEMAT)\n
 \nImplications of Cosmological Expansion Models from the Final Dark Energy
  Survey BAO and SN DataSpeaker: Santiago Ávila (CIEMAT) The Dark Energy 
 Survey (DES) recently released the final results of its two principal prob
 es of the expansion history: Type Ia Supernovae (SN) and Baryonic Acoustic
  Oscillations (BAO). In this work\, we explore the cosmological implicatio
 ns of these data in combination with external Cosmic Microwave Background 
 (CMB)\, Big Bang Nucleosynthesis (BBN)\, and age-of-the-Universe informati
 on. The BAO measurement\, which is ∼2σ away from Planck-ΛCDM predictio
 ns\, pushes for low values of Ωm compared to Planck in contrast to SN whi
 ch prefers a higher value. We identify several tensions among datasets in 
 the ΛCDM model that cannot be resolved by including either curvature or a
  constant dark energy equation of state.In w0waCDM\, the tensions are alle
 viated and we find a 3.2σ deviation from ΛCDM for DES BAO and SN in comb
 ination with Planck. For the combination of all the background cosmologica
 l probes considered (including θ* from Planck)\, we still find a deviatio
 n of 2.8σ from ΛCDM. This work provides further evidence for non-ΛCDM p
 hysics or systematics\, which is consistent with recent claims in support 
 of evolving dark energy. Measurements of Baryon Acoustic Oscillations and
  Cosmological Constraints From DESI DR2Speaker: Nicola Deiosso (CIEMAT) A
 bstract: The Dark Energy Spectroscopic Instrument (DESI) is leading a grou
 ndbreaking five-year survey to investigate the influence of dark energy on
  cosmic expansion and the evolution of large-scale structure. Latest baryo
 n acoustic oscillations (BAO) measurements and cosmological results from D
 ESI will be presented and discussed\, based on three years of observations
 \, with tens of millions of spectra collected. We considered both solely t
 he data from the survey and in combination with cosmic microwave backgroun
 d (CMB)\, supernovae (SNe)\, Big Bang Nucleosynthesis (BBN) priors\, and 3
 x2pt measurements observations\, as well as being compared with the result
 s obtained with the previous DESI BAO dataset (DR1). In this analysis\, we
  focused on the measurement of constraints on expansion rate\, with partic
 ular attention on the comparison with Planck results considering ΛCDM mod
 el\, on dark energy equation of state and on finding upper limits for the 
 sum of neutrino masses. These results provide a critical assessment of the
  standard cosmological model.  Zoom: http://cfp.ciemat.es/zoomae/evento
 s\n\nhttps://agenda.ciemat.es/event/5023/
LOCATION:Maria de Maeztu
URL:https://agenda.ciemat.es/event/5023/
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