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SUMMARY:Probing dark energy evolution with Quaia quasars through the integ
 rated Sachs-Wolfe effect
DTSTART;VALUE=DATE-TIME:20260916T150000Z
DTEND;VALUE=DATE-TIME:20260916T152500Z
DTSTAMP;VALUE=DATE-TIME:20261023T191951Z
UID:indico-contribution-31293@indico.ific.uv.es
DESCRIPTION:Speakers: Mina Ghodsi Yengejeh (Konkoly Observatory)\nThe Inte
 grated Sachs--Wolfe (ISW) effect probes the late-time evolution of gravita
 tional potentials and provides a complementary test of the nature of dark 
 energy. We investigate whether the redshift evolution of the ISW effect ca
 n provide new constraints on the time evolution of dark energy. We conside
 r theoretical predictions for the standard ΛCDM cosmology and alternative
  w0waCDM models favoured by recent DESI BAO and DES Y6 constraints. We per
 form a tomographic cross-correlation analysis of the Quaia quasar catalogu
 e and \\textit{Planck} CMB temperature maps to measure the ISW signal over
  a broad redshift range\, spanning about (10h−1 Gpc)3 comoving volume. W
 e assess the robustness of the inferred ISW amplitude against variations i
 n sky coverage\, multipole range\, and tomographic binning. We detect the 
 ISW effect at a significance of 2.8σ\, corresponding to an amplitude of A
 ISW≃1.69±0.61 relative to the Planck ΛCDM prediction. The inferred sig
 nal remains stable against various analysis choices\, including various CM
 B maps (SMICA\, NILC\, SEVEM)\, different choices of ℓmax and the number
  of multipole bins\, and an alternative quasar bias model. The measured IS
 W amplitude is moderately stronger than predicted by the fiducial ΛCDM co
 smology\, and the alternative w0waCDM models do not account for this discr
 epancy. Future tomographic ISW measurements with improved quasar catalogue
 s from Gaia and forthcoming wide-area galaxy surveys such as Euclid and DE
 SI will help clarify the origin of this difference.\n\nhttps://indico.ific
 .uv.es/event/8160/contributions/31293/
LOCATION:
URL:https://indico.ific.uv.es/event/8160/contributions/31293/
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