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Nelson-Barr ultralight dark matter

Michael Dine

Gilad Perez and Wolfram Ratzinger

Inbar Savoray

  • Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, Santa Cruz, California, USA

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Phys. Rev. D 111, 015049 – Published 31 January, 2025

DOI: https://doi.org/10.1103/PhysRevD.111.015049

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 elements of the Cabibbo–Kobayashi–Maskawa matrix 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.

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Phys. Rev. D 111, 015049– Published 31 January, 2025
  • Received 21 August 2024
  • Revised 29 November 2024
  • Accepted 15 January 2025
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