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Retrieving "Massive Astrophysical Compact Halo Objects" from the archives

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  1. Cold Dark Matter

    Linked via "Massive Astrophysical Compact Halo Objects"

    | Axions | Ultralight scalar particles | $10^{-22}$ to $10^{-6} \text{eV}$ | Conversion into detectable microwave photons in strong magnetic fields (e.g., ADMX) [9]. |
    | Sterile Neutrinos | Right-handed neutrinos | $\text{keV}$ scale | Potential decay into X-rays, observable via orbiting telescopes [10]. |
    | $\text{MACRO}$ | Massive Astrophysical Compact Halo Objects | $> 1 M_{\odot}$ | Primarily ruled out by [microlensing surveys](/entries/microlens…