Cosmology with the Lyman-a Forest 3D Power Spectrum

Mar 04, 2024 - 11:00 am to 12:00 pm

Campus, Varian 355

Roger de Belsunce (UC Berkeley) In Person and zoom

Zoom info:

The Lyman-a forest traces large-scale structure at Mpc scales and below at high redshifts (2 < z < 4). Given the sparse sampling of the Lya forest transverse to the line-of-sight, gridded Fourier-transform-based estimators are affected by the non-trivial window matrix. I will present a weighted pair-count estimator in configuration space, effectively measuring the anisotropic clustering without the need for fast Fourier transforms. I will discuss a series of tests on Gaussian mocks including realistic noise levels, survey geometries and contaminants. I will present the first measurement of the 3D Lyman-a forest power spectrum. Finally, I will discuss ongoing work to perform a full-shape cosmological analysis of Lyman-a forest data from cosmological surveys such as eBOSS, DESI and future surveys.