CMB lensing and Lyα\ forest cross bispectrum from DESI's first-year quasar sample
Abstract
The squeezed cross-bispectrum \ between the gravitational lensing in the Cosmic Microwave Background and the 1D \ forest power spectrum can constrain bias parameters and break degeneracies between σ8 and other cosmological parameters. We detect \ with 4.8σ significance at an effective redshift zeff=2.4 using Planck PR3 lensing map and over 280,000 quasar spectra from the Dark Energy Spectroscopic Instrument's first-year data. We test our measurement against metal contamination and foregrounds such as Galactic extinction and clusters of galaxies by deprojecting the thermal Sunyaev-Zeldovich effect. We compare our results to a tree-level perturbation theory calculation and find reasonable agreement between the model and measurement.
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