• second "livepost" from the Texas Symposium on Relativistic Astrophysics

    From Phillip Helbig (undress to reply)@21:1/5 to All on Wed Dec 18 01:54:18 2019
    At most of the last few conferences I've been to, including this one,=20
    there has been a talk pointing out that primordial black holes could make=20
    up most or all of the (unknown, non-baryonic) dark matter. Some mass=20
    ranges have not been ruled out, and some which have been have been ruled=20
    out only for all objects of the same mass (or nearly so), rather than a=20
    more or less broad distribution (which is a more natural expectation). =20 These would be spinless, and that seems consistent with LIGO data. No=20
    new physics is needed. Numerical simulations are still not=20
    high-resolution enough to distinguish between even massive black holes=20
    and particles of much less mass. Perhaps they can explain the=20
    small-scale problems in LambdaCDM. I'm not sure why this is often seen=20
    as a dark horse, especially since direct-detection experiments have=20
    found no sign of other types of dark matter. (At the same time, absence=20
    of evidence is not evidence of absence, and the jury is still out. =20
    There are also other types of dark matter which such experiments would=20
    not detect.)

    The speaker was Juan Garcia Bellido. More details can be found at https://arxiv.org/abs/1906.08217 of which he is one of the four authors.
    Of course, my recollection of the talk might be imperfect, but I would
    hope that the arXiv paper gets the details right.

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