Dark Matter is narrowed by new research:

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Nov 15, 2017.

  1. paddoboy Valued Senior Member

    Hunt for dark matter is narrowed by new research
    November 15, 2017

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    Michał Rawlik of ETH Zürich and Nicholas Ayres of Sussex Uni. Credit: University of Sussex
    Scientists at the University of Sussex have disproved the existence of a specific type of axion - an important candidate 'dark matter' particle - across a wide range of its possible masses.

    Read more at: https://phys.org/news/2017-11-dark-narrowed.html#jCp


    Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields:

    We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10−24≤ma≤10−17eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.


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