Correlation Analysis of Decaying Sterile Neutrino Dark Matter in the Context of the SRG Mission

TL;DR

This paper analyzes the correlation between sterile neutrino dark matter decay signatures and galaxy distributions using the 2MRS catalog, aiming to improve constraints on sterile neutrino properties with current and future X-ray observations.

Contribution

It introduces a detailed correlation analysis framework for sterile neutrino decay signals and galaxy distributions, incorporating both Limber and extended Limber approximations for improved accuracy.

Findings

Power spectra calculated for eROSITA and ART-XC telescopes.

Extended Limber approximation enhances small multipole analysis.

Constraints on sterile neutrino parameters derived from correlation spectra.

Abstract

We provide a correlation analysis of signatures associated with traces of the dark matter decay and the galaxy spatial distribution according to the 2MRS catalog of galaxies. Signature data analysis plays an important role in the context of current and future observations and cosmological constraints. Attention is paid to the constraints that can be obtained for decaying sterile neutrinos when analyzing observations in the context of the Spectr-Roentegn-Gamma (SRG) mission. We study the correlation spectra of dark matter and galaxies, which can be obtained both for the eROSITA telescope and for the first time for the ART-XC telescope. The analysis is carried out both within the framework of the Limber approximation and within the framework of the extended Limber approximation, which makes it possible to more accurately study the power spectra in the region of small multipoles. We calculate the power spectra in both approaches and examine the contribution of different ranges of multipoles to the resulting constraints on sterile neutrino parameters.