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second "livepost" from the Texas Symposium on Relativistic Astrophysics
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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