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- W2912194312 abstract "Axion-like particles (ALPs) with couplings to electromagnetism have long been postulated as extensions to the Standard Model. String theory predicts an axiverse of many light axions, some of which may make up the dark matter in the universe and/or solve the strong CP problem. We propose a new experiment using superconducting radiofrequency (SRF) cavities which is sensitive to light ALPs independent of their contribution to the cosmic dark matter density. Off-shell ALPs will source cubic nonlinearities in Maxwell's equations, such that if a SRF cavity is pumped at frequencies $omega_1$ and $omega_2$, in the presence of ALPs there will be power in modes with frequencies $2omega_1 pm omega_2$. Our setup is similar in spirit to light-shining-through-walls (LSW) experiments, but because the pump field itself effectively converts the ALP back to photons inside a single cavity, our sensitivity scales differently with the strength of the external fields, allowing for superior reach as compared to experiments like OSQAR while utilizing current technology. Furthermore, a well-defined program of increasing sensitivity has a guaranteed physics result: the first observation of the Euler-Heisenberg term of low-energy QED at energies below the electron mass. We discuss how the ALP contribution may be separated from the QED contribution by a suitable choice of pump modes and cavity geometry, and conclude by describing the ultimate sensitivity of our proposed program of experiments to ALPs." @default.
- W2912194312 created "2019-02-21" @default.
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- W2912194312 date "2019-07-09" @default.
- W2912194312 modified "2023-10-15" @default.
- W2912194312 title "Probing Axionlike Particles and the Axiverse with Superconducting Radio-Frequency Cavities" @default.
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- W2912194312 doi "https://doi.org/10.1103/physrevlett.123.021801" @default.
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