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                "Baryons, dark matter and black holes: a common origin"





 Thursday, 19. Sept. 2019

    Video-Recording for any system with MP4-support

   - Video.mp4  (ca.404 Mb)

 15:15 – 16:25



                                                            Juan Garcia-Bellido

                                                     (Universidad Autonoma de Madrid)


Abstract :

Twenty-three years ago, it was predicted that massive primordial black holes (PBH)

would form via the gravitational collapse of radiation and matter associated with high

peaks in the spectrum of curvature fluctuations, and that they could constitute all of

the dark matter (DM) today. In 2015, it was suggested that the clustering and broad

mass distribution of PBH, which peaks at several Msun, and whose high-mass tails

could be responsible for the seeds of all galaxies. Since then, AdvLIGO-Virgo

interferometers have detected gravitational waves from at least thirty merger events

of very massive and spinless black hole binaries, and we propose that they are PBH.

We have recently understood that a universal mechanism associated with rapid changes

in the number of relativistic species in the early universe could have been responsible

for the formation of PBH at specific scales and thus have a very concrete prediction

for the mass spectrum of DM-PBH, with broad peaks at 10^{-5}, 1, 100, and 10^6 Msun.

 In particular, the QCD quark-hadron transition could be responsible for the efficient

production of baryons over antibaryons at PBH collapse, thus explaining the presence

of baryons today and the relative abundance of DM. We predict that within a few months

a less than one solar mass PBH will be detected by AdvLIGO-Virgo, and that in a few

years an array of GW detectors could be used to determine the mass and spin distribution

of PBH dark matter with 10% accuracy.  Thus, gravitational wave astronomy could be

responsible for a new paradigm shift in the understanding of the nature of dark matter and

galaxy formation.


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