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"Baryons,
dark matter and black holes: a common origin"
|
Date: |
Download-files: |
Time: |
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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.