An SU(2) gauge principle for the Cosmic Microwave Background: Perspectives on the Dark Sector of the Cosmological Model

TL;DR

This paper explores the implications of modeling the Cosmic Microwave Background with an SU(2) gauge principle, proposing new perspectives on the dark sector and structure formation in cosmology.

Contribution

It introduces a novel SU(2) gauge framework for the CMB and discusses its effects on dark matter and structure formation, extending beyond traditional U(1) models.

Findings

SU(2) gauge principle alters CMB radiation properties

Potential role of ultralight axions in structure formation

Hierarchical Yang-Mills contributions influence axion dynamics

Abstract

We review consequences for the radiation and dark sectors of the cosmological model arising from the postulate that the Cosmic Microwave Background (CMB) is governed by an SU(2) rather than a U(1) gauge principle. We also speculate on the possibility of actively assisted structure formation due to the de-percolation of lump-like configurations of condensed ultralight axions with a Peccei-Quinn scale comparable to the Planck mass. The chiral-anomaly induced potential of the axion condensate receives contributions from SU(2)/SU(3) Yang-Mills factors of hierarchically separated scales which act in a screened (reduced) way in confining phases.