Speaker
Description
I will discuss a novel broadband strategy to search for axions by leveraging observables controlled by the axion field squared. A practical implementation of this concept, allowing to probe the axion–photon coupling, is to operate a dc SQUID at the flux sweet spot. There, the output voltage depends quadratically on the magnetic flux. Using lock-in modulation one can also evade low-frequency noise.
The proposed setup is ultra-broadband, spanning over 15 orders of magnitude in axion mass, with further expansion of the mass range possible. The projected sensitivity is |gaγγ| ≳ 10^{-16} GeV^{-1}, orders of magnitude better than current bounds, and largely independent of axion mass. I will discuss the sources of systematic background and a nulling technique to reduce them to an acceptable level.
This strategy can be extended to other axion couplings and other wave dark matter candidates.
Based on a work in collaboration with Kin Chun Fong and Lam Hui (2605.11078).
| Primary Abstract Topic | Theory: Axions and Wave-Like-DM |
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