A Lighter QCD Axion from Anarchy
Fatemeh Elahi, Gilly Elor, Alexey Kivel, Julien Laux, Saereh Najjari,, Felix Yu

TL;DR
The paper proposes the Anarchic Axion, a lighter QCD axion model that addresses the Strong CP problem, predicts a residual neutron EDM, and opens new experimental parameter space.
Contribution
It introduces a novel axion model with soft symmetry breaking, providing a new framework for axion searches and effective field theory targets.
Findings
Lighter axion consistent with nEDM constraints
Residual neutron electric dipole moment predicted
New parameter space for axion experiments
Abstract
We introduce the Anarchic Axion, a class of axion models which solves the Strong CP problem within current nEDM constraints with a lighter than usual QCD axion, thus populating new parameter space that ongoing and future experiments target. The Anarchic Axion is driven light by a soft breaking of the Peccei-Quinn symmetry, which also predicts a residual neutron electric dipole moment. We introduce a novel measure to quantify the tuning required for large deviations from the usual QCD axion band. In addition to motivating searches for unusually light axions, this work establishes a new target for axion effective field theory.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsDark Matter and Cosmic Phenomena · Atomic and Subatomic Physics Research · Cosmology and Gravitation Theories
