A Near-Cutoff Waveguide Haloscope for sub-meV Dark Matter

Chuan-Yang Xing; Bin Zhu

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arXiv · 2605.15820

A Near-Cutoff Waveguide Haloscope for sub-meV Dark Matter

Chuan-Yang Xing·Bin Zhu

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Abstract

We propose a near-cutoff parallel-plate waveguide haloscope for sub-meV dark matter. The concept retains the large-area openness of a dish antenna while providing cavity-like field enhancement through slow-wave response and coherent accumulation, without relying on a closed standing-wave resonance. For a copper waveguide, the projected dark photon sensitivity reaches $\varepsilon\simeq2.1\times10^{-15}$ near $m_{A'}\simeq 0.1\,\mathrm{meV}$. With an external magnetic field, the same transducer can approach QCD axion parameter space. The waveguide haloscope highlights a sensitive and scalable route toward future sub-meV bosonic dark matter searches.

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Chuan-Yang Xing, Bin Zhu. 2026-05-15. A Near-Cutoff Waveguide Haloscope for sub-meV Dark Matter. https://arxiv.org/abs/2605.15820

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