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Creators/Authors contains: "Kaplan, David E"

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  1. ; ; ; ; (, Physical Review D)
    Light, weakly coupled bosonic particles such as axions can mediate long range monopole-dipole interactions between matter and spins. We propose a new experimental method to detect such a force exerted by the spin of electrons on a freely falling atom using atom interferometry. The intrinsic advantages of atom interferometry, such as the freely falling nature of the atom and the well-defined response of the atom to external magnetic fields, should enable the proposed method to overcome systematic effects induced by vibrations, magnetic fields, and gravity. This approach is most suited to probe forces with a range ≳ 10     cm . With current technology, our proposed setup could potentially extend probes of such forces by an order of magnitude beyond present laboratory limits. Published by the American Physical Society2025 
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    Free, publicly-accessible full text available June 1, 2026
  2. ; ; (, Physical Review D)
    We study the consequences of new long-range forces between neutrinos on cosmic scales. If these forces are a few orders of magnitude stronger than gravity, they can induce perturbation instability in the nonrelativistic cosmic neutrino background in the late time universe. As a result, the cosmic neutrino background may form nonlinear bound states instead of free-streaming. The implications of the formation of nonlinear neutrino bound states include enhancing matter perturbations and triggering star formation. Based on existing measurements of the matter power spectrum and reionization history, we place new constraints on long-range forces between neutrinos with ranges lying in 1     kpc ≲ m ϕ − 1 ≲ 10     Mpc . Published by the American Physical Society2025 
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    Free, publicly-accessible full text available March 1, 2026
  3. ; ; ; ; (, Journal of High Energy Physics)
    We propose to use atoms and molecules as quantum sensors of axion-mediated monopole-dipole forces. We show that electron spin precession experiments using atomic and molecular beams are well-suited for axion searches thanks to the presence of co-magnetometer states and single-shot temporal resolution. Experimental strategies to detect axion gradients from localised sources and the earth are presented, taking ACME III as a prototype example. Other possibilities including atomic beams, and laser-cooled atoms and molecules are discussed. 
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  4. ; ; (, Journal of High Energy Physics)
    A bstract We describe the model-independent mechanism by which dark matter and dark matter structures heavier than ~ 8 × 10 11 GeV form binary pairs in the early Universe that spin down and merge both in the present and throughout the Universe’s history, producing potentially observable signals. Sufficiently dense dark objects will dominantly collide through binary mergers instead of random collisions. We detail how one would estimate the merger rate accounting for finite size effects, multibody interactions, and friction with the thermal bath. We predict how mergers of dark dense objects could be detected through gravitational and electromagnetic signals, noting that such mergers could be a unique source of high frequency gravitational waves. We rule out objects whose presence would contradict observations of the CMB and diffuse gamma-rays. 
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  5. ; ; ; ; ; (, Physical Review Letters)
  6. ; ; (, Physics Letters B)
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  7. ; ; (, Physical Review D)
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  8. ; ; ; ; (, Physical Review Letters)
  9. ; ; ; ; (, Physical Review Letters)
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  10. ; (, Physical Review D)
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