Earth as a transducer for axion dark-matter detection

Abstract

We demonstrate that ultralight axion dark matter with a coupling to photons induces an oscillating global terrestrial magnetic field signal in the presence of the background geomagnetic field of the Earth. This signal is similar in structure to that of dark-photon dark matter that was recently pointed out and searched for in [arXiv:2106.00022] and [arXiv:2108.08852]. It has a global vectorial pattern fixed by the Earth's geomagnetic field, is temporally coherent on long time scales, and has a frequency set by the axion mass $m_a$. In this work, we both compute the detailed signal pattern, and undertake a search for this signal in magnetometer network data maintained by the SuperMAG Collaboration. Our analysis identifies no strong evidence for an axion dark-matter signal in the axion mass range $2\times 10^{-18}\text{eV}\lesssim m_a\lesssim 7\times 10^{-17}\text{eV}$. Assuming the axion is all of the dark matter, we place constraints on the axion-photon coupling $g_{a\gamma }$ in the same mass range; at their strongest, for masses $3\times 10^{-17}\text{eV}\lesssim m_a\lesssim 4\times 10^{-17}\text{eV}$, these constraints are comparable to those obtained by the CAST helioscope.

24 pages, 1 figure. Published version

References in corpus (9)

• Dark Matter Candidates from Particle Physics and Methods of Detection
• Dielectric Haloscopes: A New Way to Detect Axion Dark Matter
• Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles
• Physics potential of the International Axion Observatory (IAXO)
• Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields
• Search for axionlike dark matter with a liquid-state nuclear spin comagnetometer
• Search for axion-like dark matter using solid-state nuclear magnetic resonance
• Earth as a transducer for dark-photon dark-matter detection
• Constraints on axionlike dark matter with masses down to $10^{-23}$ eV/c${}^2$

Cited by in corpus (1)

• Advancing Globular Cluster Constraints on the Axion-Photon Coupling