Nelson-Barr ultralight dark matter

Abstract

We show that, in the Nelson-Barr solution to the strong CP-problem, a naturally light scalar can arise. It gives rise to a completely new phenomenology beyond that of the celebrated QCD axion, if this field constitutes dark matter, as the CKM elements vary periodically in time. We also discuss how the model can be tested using quantum sensors, in particular using nuclear clocks, which leads to an interesting synergy between different frontiers of physics.

8 pages, typos fixed

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Cited by in corpus (5)

• Searching for dark matter with the Th-229 nuclear lineshape from laser spectroscopy
• On the sensitivity of nuclear clocks to new physics
• Leptogenesis in automatic Nelson-Barr models
• Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation
• Exploring the Landscape of Spontaneous CP Violation in Supersymmetric Theories