CMB lensing and Lyα forest cross bispectrum from DESI's first-year quasar sample
The squeezed cross-bispectrum Bκ,Lyα between the gravitational lensing in the cosmic microwave background and the 1D Lyα forest power spectrum can constrain bias parameters and break degeneracies between σ8 and other cosmological parameters. We detect Bκ,Lyα 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.
Publication Details
- Journal
- UCL Discovery (University College London)
- Published
- 2024-09-15
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Gordon and Betty Moore Foundation
- California Institute of Technology
- Chinese Academy of Sciences
- Consejo Nacional de Ciencia y Tecnología
- Ministerio de Ciencia e Innovación
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives
- Office of Science
- Jet Propulsion Laboratory
- Science and Technology Facilities Council
- Division of Astronomical Sciences
- High Energy Physics
- Lawrence Berkeley National Laboratory