CMB lensing and Ly\alpha\ forest cross bispectrum from DESI's first-year quasar sample
Abstract
The squeezed cross-bispectrum \bispeconed\ between the gravitational lensing in the Cosmic Microwave Background and the 1D \lya\ forest power spectrum can constrain bias parameters and break degeneracies between and other cosmological parameters. We detect \bispeconed\ with significance at an effective redshift 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.
Cite
@article{arxiv.2405.14988,
title = {CMB lensing and Ly\alpha\ forest cross bispectrum from DESI's first-year quasar sample},
author = {N. G. Karaçaylı and P. Martini and D. H. Weinberg and S. Ferraro and R. de Belsunce and J. Aguilar and S. Ahlen and E. Armengaud and D. Brooks and T. Claybaugh and A. de la Macorra and B. Dey and P. Doel and K. Fanning and J. E. Forero-Romero and S. Gontcho A Gontcho and A. X. Gonzalez-Morales and G. Gutierrez and J. Guy and K. Honscheid and D. Kirkby and T. Kisner and A. Kremin and A. Lambert and M. Landriau and L. Le Guillou and M. E. Levi and M. Manera and A. Meisner and R. Miquel and E. Mueller and A. Muñoz-Gutiérrez and A. D. Myers and J. A. Newman and J. Nie and G. Niz and N. Palanque-Delabrouille and W. J. Percival and C. Poppett and F. Prada and C. Ravoux and M. Rezaie and A. J. Ross and G. Rossi and E. Sanchez and E. F. Schlafly and D. Schlegel and H. Seo and D. Sprayberry and T. Tan and G. Tarlé and B. A. Weaver and H. Zou},
journal= {arXiv preprint arXiv:2405.14988},
year = {2024}
}
Comments
13 pages excluding references, 8 figures