First Search for Ultraheavy Dark Matter Using a Magnetically Levitated Particle

• URL: http://arxiv.org/abs/2608.20464v1
• Date: Thu, 20 Aug 2026 18:00:18 GMT
• Title: First Search for Ultraheavy Dark Matter Using a Magnetically Levitated Particle
• Abstract summary: We present the first search for ultraheavy dark matter using a magnetically levitated particle.<n>The POLONAISE experiment uses a milligram-scale ferromagnet levitated in a superconducting trap.<n>Our results extend levitated sensing beyond the mass reach of optical levitation by seven orders of magnitude into the ultraheavy dark matter frontier.
• Score: 0.009356426151788713
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present the first search for ultraheavy dark matter using a magnetically levitated particle. The POLONAISE experiment uses a milligram-scale ferromagnet levitated in a superconducting trap, admitting a force sensitivity of $0.07\,\mathrm{fN\,Hz^{-1/2}}$ and resolving impulses as small as $1\,\mathrm{TeV}/c$. Treating every candidate impulse as a possible dark matter event, we set optimum-interval upper limits on the neutron coupling $α_n$ for dark matter interacting through a new light mediator. For dark matter masses $10^6\,\mathrm{GeV}/c^2\text{-}10^{15}\,\mathrm{GeV}/c^2$ and mediators lighter than $30\,\mathrm{meV}/c^2$, we exclude couplings as low as $α_n = 3.2\times 10^{-9}$ at $95\%$ confidence level and set leading constraints on the dark matter-neutron cross section for composite dark matter. Our results extend levitated sensing beyond the mass reach of optical levitation by seven orders of magnitude into the ultraheavy dark matter frontier.

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