Preprint

PUBDB-2025-02071

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sensitivity of a Gigahertz Fabry-Pérot Resonator for Axion Dark Matter Detection

Egge, J. (Corresponding author)DESY* ; Meyer, M.Extern*

2025

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Report No.: arXiv:2506.03091

Abstract: Axions are hypothetical pseudo-Nambu Goldstone bosons that could explain the observed cold dark matter density and solve the strong CP problem of quantum chromodynamics (QCD). Haloscope experiments commonly employ resonant cavities to search for a conversion of axion dark matter into photons in external magnetic fields. As the expected signal power degrades with increasing frequency, this approach becomes challenging at frequencies beyond tens of Gigahertz. Here, we propose a novel haloscope design based on an open Fabry-Pérot resonator. Operating a small-scale resonator at cryogenic temperatures and at modest magnetic fields should already lead to an unparalleled sensitivity for photon-axion couplings $g_{aγ} \gtrsim 3\times10^{-12}\,\mathrm{GeV}^{-1}$ at 35GHz. We demonstrate how this sensitivity could be further improved using graded-phase mirrors and sketch possibilities to probe benchmark models of the QCD axion.

Note: 10 pages, 8 figures, 1 table. Submitted

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Contributing Institute(s):

1. Any Light Particle Search (ALPS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)
3. AxionDM - Searching for axion and axion-like-particle dark matter in the laboratory and with high-energy astrophysical observations (948689) (948689)

Experiment(s):

1. Any Light Particle Search

Appears in the scientific report 2025

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