QCD axion dark matter and the cosmic dipole problem

TL;DR

This paper explores whether the QCD axion, a dark matter candidate, can explain the observed discrepancy between galaxy number count dipole and CMB dipole measurements.

Contribution

It proposes a novel approach linking QCD axion dark matter to the cosmic dipole problem, offering a potential solution to a longstanding observational discrepancy.

Findings

QCD axion could influence cosmic dipole measurements

Potential resolution of galaxy-CMB dipole discrepancy

New insights into dark matter's role in cosmic anisotropies

Abstract

There is increasing evidence suggesting a discrepancy between the cosmic dipole observed in the number count of distant galaxies and the one derived from the cosmic microwave background (CMB). In this study, we investigate the possibility that the cosmic dipole problem can be addressed by considering the QCD axion, a hypothetical particle that arises from the spontaneous breaking of the Peccei-Quinn symmetry and is postulated to constitute the dark matter in our universe.