Search for ultra-light axions with CMB polarization

2023/04/07 by Diego-Palazuelos, P. · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2304.03647

Abstract

When coupled to electromagnetism via a Chern-Simons interaction, axion-like particles (ALP) produce a rotation of the plane of linear polarization of photons known as cosmic birefringence. Recent measurements of cosmic birefringence obtained from the polarization of the cosmic microwave background (CMB) hint at the existence of an isotropic birefringence angle of β≈ 0.3^∘, currently excluding β=0 with a statistical significance of 3.6σ. Were such measurement to be confirmed as a cosmological signal, CMB information alone could constrain the ALP parameter space for masses m_ϕ\lesssim 10^-27eV and axion-photon coupling constants g_ϕγ\gtrsim 10^-20GeV^-1.

Cited by

• Axion couplings in Orbifold GUTs
• Testing the Heterotic String with the Axion-Photon Coupling

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