The large-scale modulation of the density distribution in standard axionic CDM and its cosmological and physical impact

TL;DR

This paper explores how the energy density of axion fields forms large-scale inhomogeneous structures called archioles, affecting cosmological observations like relic radiation anisotropies and providing constraints on axion interactions.

Contribution

It introduces the concept of archioles as nonlinear inhomogeneous structures in axion dark matter and analyzes their impact on cosmological spectra and anisotropies.

Findings

Spectrum of inhomogeneities generated by archioles is characterized.

Effects of archioles on relic radiation quadrupole anisotropy are evaluated.

Model-independent constraints on axion interaction scale are derived.

Abstract

It is shown, that the energy density of coherent axion field oscillations in the cosmology of standard invisible axion should be distributed in the Universe in the form of archioles, being nonlinear inhomogeneous structure, reflecting the large scale distribution of Brownian structure of axion strings in the very early Universe. Spectrum of inhomogeneities, generated by archioles, is obtained and their effects in the spectrum and quadrupole anisotropy of relic radiation are considered. The axionic-string-decay-model-independent restriction on the scale of axion interaction is obtained.