Separating the memory of reionization from cosmology in the Ly$\alpha$ forest power spectrum at the post-reionization era
Paulo Montero-Camacho, Yuchen Liu, Yi Mao

TL;DR
This paper introduces a simple, model-independent analytical template to account for the impact of cosmic reionization on the Lyα forest power spectrum, enabling more accurate cosmological inference by marginalizing over reionization effects.
Contribution
It proposes a new analytical template for the reionization impact, reducing model dependence and computational cost in Lyα forest analyses for cosmology.
Findings
Template achieves ≤6% error at large scales
Reproduces broadband effects of reionization in correlation functions
Successfully recovers forecast errors in cosmological parameters
Abstract
It has been recently shown that the astrophysics of reionization can be extracted from the Ly forest power spectrum by marginalizing the memory of reionization over cosmological information. This impact of cosmic reionization on the Ly forest power spectrum can survive cosmological time scales because cosmic reionization, which is inhomogeneous, and subsequent shocks from denser regions can heat the gas in low-density regions to K and compress it to mean-density. Current approach of marginalization over the memory of reionization, however, is not only model-dependent, based on the assumption of a specific reionization model, but also computationally expensive. Here we propose a simple analytical template for the impact of cosmic reionization, thereby treating it as a broadband systematic to be marginalized over for Bayesian inference of cosmological…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsMonetary Policy and Economic Impact · Cosmology and Gravitation Theories
