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SUMMARY:Preference for evolving dark energy in light of the galaxy bispect
 rum
DTSTART:20250506T120000Z
DTEND:20250506T140000Z
DTSTAMP:20260420T084700Z
UID:indico-event-36032@indico.in2p3.fr
DESCRIPTION:Speakers: Théo SIMON (Montpellier Universe and Particles Labo
 ratory - CNRS)\n\nIn this talk\, I will first present the paradigm of the 
 effective field theory of large-scale structure (EFTofLSS)\, a semi-analyt
 ical method which provides an accurate description of the power spectrum a
 nd bispectrum of bias tracers\, and aims at improving cosmological constra
 ints from large-scale structure surveys\, a major challenge in the context
  of DESI and the forthcoming Euclid mission. Second\, I will present our r
 esults obtained in arXiv:2503.04602\, where we constrain the dark energy e
 quation of state parametrized by (w0\, wa) through an EFTofLSS bispectrum 
 analysis applied to SDSS data. Using pre-DESI clustering data\, combined w
 ith CMB data from Planck and supernova data from Pantheon+\, Union3\, or 
 DESY5\, we find a 2.8 − 3.9 sigma preference for evolving dark energy o
 ver the cosmological constant Λ. This preference appears only when we inc
 lude the one-loop bispectrum\, demonstrating the importance of this contri
 bution to constraining the dark energy history. Finally\, our findings are
  interpreted within the Effective Field Theory of Dark Energy (EFTofDE)\, 
 considering the clustering quintessence limit and the smooth quintessence 
 limit.\n \n\nhttps://indico.in2p3.fr/event/36032/
URL:https://indico.in2p3.fr/event/36032/
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