Author:
Babić Ivana,Schmidt Fabian,Tucci Beatriz
Abstract
Abstract
The physical scale corresponding to baryon acoustic oscillations (BAO), the size of the
sound horizon at recombination, is precisely determined by CMB experiments. Measuring the
apparent size of the BAO scale imprinted in the clustering of galaxies gives us a direct estimate
of the angular-diameter distance and the Hubble parameter as a function of redshift. The BAO
feature is damped by non-linear structure formation, which reduces the precision with which we can
infer the BAO scale from standard galaxy clustering analysis methods. Many methods to undo this
damping via the so-called BAO reconstruction have so far been proposed; however, they all rely on
backward modeling. In this paper, we present the first results of isotropic BAO inference from
rest-frame halo catalogs using forward modeling combined with the EFT likelihood, in the case
where the initial phases of the density field are fixed. We show that the remaining systematic
bias is less than 2% when we consider cutoff values of Λ ≤ 0.25 h Mpc-1
for all halo samples considered, and below 1% and consistent with zero for all but the most
highly biased samples. We also demonstrate that, when compared to the standard power spectrum
likelihood approach under the same assumption of fixed phases, the 1σ errors associated to
the field level inference of the BAO scale are 1.1 to 3.3 times smaller, depending on the value of
the cutoff and the halo sample. Our analysis therefore unveils another promising feature of using
field-level inference for high-precision cosmology.
Subject
Astronomy and Astrophysics
Cited by
4 articles.
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