A unified harmonic framework for dark siren cosmology
April Qiu Cheng, Jonathan Gair

TL;DR
This paper introduces a unified harmonic cross-correlation framework for dark siren cosmology, enabling precise inference of cosmological parameters from gravitational wave data without electromagnetic counterparts.
Contribution
It extends existing dark siren methods by combining cross-correlation with galaxy clustering and spectral information, improving scalability and precision for next-generation GW surveys.
Findings
Cross-correlation alone can measure H_0 and Ω_m to 1% and 5% with 2 years of data.
The method effectively marginalizes over galaxy field realizations, incorporating galaxy clustering.
Next-generation detectors are needed to fully realize the method's potential due to large-number statistics requirements.
Abstract
The galaxy catalog dark siren method aims to infer cosmological parameters from gravitational waves (GWs) without an electromagnetic counterpart by statistically marginalizing over possible host galaxies. The cross-correlation of GW sources and galaxies is a promising avenue for cosmological inference without requiring observed host galaxies, by leveraging 2-point statistics. We provide a detailed guide to the cross-correlation method, clarifying its relationship to standard dark siren techniques as well as the assumptions necessary to be able to use this formalism on GW data. We show that the cross-correlation method is an extension of the angular part of the galaxy catalog method in which we effectively marginalize over all possible realizations of the unknown galaxy field, jointly adding information from galaxy--galaxy clustering. Combined with the spectral sirens method, which…
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.
