Detailed Record
CMB lensing and Ly𝛼 forest cross bispectrum from DESI’s first-year quasar sample
| Abstract | 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. |
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| Authors |
N. G. Karaçaylı  , Paul Martini , David H. Weinberg , Simone Ferraro , Roger de Belsunce , J. Aguilar , S. P. Ahlen , E. Armengaud , D. Brooks , T. Claybaugh , Axel de la Macorra , Biprateep Dey , P. Doel , K. Fanning , J. E. Forero-Romero , Satya Gontcho A Gontcho , A. X. Gonzalez-Morales , G. Gutiérrez , J. Guy , Klaus Honscheid , D. Kirkby , Theodore Kisner , A. Kremin , A. Lambert , M. Landriau , L. Le Guillou , M. E. Levi , Marc Manera , Aaron M. Meisner , R. Miquel , Eva-Maria Mueller , A. Muñoz-Gutiérrez , Adam D. Myers  , Jeffrey A. Newman , Jundan Nie , G. Niz , N. Palanque‐Delabrouille , Will J. Percival , C. Poppett , F. Prada , C. Ravoux , Mehdi Rezaie , Ashley J. Ross , G. Rossi , E. Sánchez , E. F. Schlafly , David J. Schlegel , Hee‐Jong Seo , David Sprayberry , Ting Tan , G. Tarlé , B. A. Weaver , Hu Zou
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| Journal Info | American Physical Society | Physical review. D/Physical review. D. , vol: 110 , iss: 6 |
| Publication Date | 9/3/2024 |
| ISSN | 2470-0010 |
Type |
article |
| Open Access |
closed
|
| DOI | https://doi.org/10.1103/physrevd.110.063505 |
| Keywords |
Photometric redshift (Score: 0.4761826) |