Probing ultra-light dark photon from inverse Compton-like scattering

Abstract

Dark photon not only provides a portal linking dark sector particles and ordinary matter but also is a well-motivated dark matter candidate. We propose to detect the dark photon dark matter through the inverse Compton-like scattering process $p+{\gamma }^{\prime }\to p+\gamma$. Thanks to the ultra-high energy primary cosmic rays, we find that such a method is able to probe the dark photon mass from $10^{-2}$ eV down to $10^{-19}$ eV with the expected sensitivity of eROSITA $X$-ray telescope, which can extend the current lower limit of dark photon mass from Jupiter's magnetic fields experiment by about three orders of magnitude.

9 pages, 4 figures, discussions and references added, version accepted by PRD

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Cited by in corpus (4)

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• An Improved Bound on Accelerated Light Dark Matter
• Curl up with a good $\mathbf{B}$: Detecting ultralight dark matter with differential magnetometry
• Plasmon-enhanced Direct Detection Method for Boosted sub-MeV Dark Matter