Title: Primordial Black Holes in Light of LIGO/Virgo Observations
Abstract: Assuming that a fraction of dark matter is in primordial black holes (PBHs), a population of PBH binaries is formed before matter-radiation equality from large Poisson fluctuations in their spatial distribution. In this talk I will show that many of these binaries are disrupted by a nearby PBH or a small cluster of PBHs, yet a large fraction of them survives until they merge. I will present a derivation for a lower bound on the PBH merger rate and show that the LIGO/Virgo observations give the strongest constraint on the abundance of O(10) solar mass PBHs. I will also show that the PBH binaries can be responsible for the LIGO/Virgo events if 0.2% of dark matter is in PBHs with a narrow mass function that peaks at ~20 solar mass.
After many weeks, here's the moment both @INPHOJames and I captured the starlings forming the shape of a bird over Lough Ennell, Co. Westmeath https://t.co/9zY5DpD7T2
We have entered the last month to capture that amazing photo of the sky and win our Astrophotography competition.
We are accepting photographs taken between 01 January 2020 and 31 March 2021.
You can submit an entry up to Friday 02nd April 2021.
More: dias.ie/reachforthesta…
Meet the Judges of our "Reach for the Stars" Astrophotography competition!
@petertgallagher is Head of @DIASAstronomy & has spent the past two decades studying the Sun its impacts on the Earth. To learn more and submit an entry see
dias.ie/reachforthesta…#DIASdiscovers
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Last Updated: 23rd November 2020 by Denjoe O'Connor
Ville Vaskonen (King’s College London)
Title: Primordial Black Holes in Light of LIGO/Virgo Observations
Abstract: Assuming that a fraction of dark matter is in primordial black
holes (PBHs), a population of PBH binaries is formed before matter-radiation
equality from large Poisson fluctuations in their spatial distribution. In
this talk I will show that many of these binaries are disrupted by a nearby
PBH or a small cluster of PBHs, yet a large fraction of them survives until
they merge. I will present a derivation for a lower bound on the PBH merger
rate and show that the LIGO/Virgo observations give the strongest constraint
on the abundance of O(10) solar mass PBHs. I will also show that the PBH
binaries can be responsible for the LIGO/Virgo events if 0.2% of dark matter
is in PBHs with a narrow mass function that peaks at ~20 solar mass.
Talk – Video
Talk – Slides
Category: Uncategorised
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We have entered the last month to capture that amazing photo of the sky and win our Astrophotography competition. We are accepting photographs taken between 01 January 2020 and 31 March 2021. You can submit an entry up to Friday 02nd April 2021. More: dias.ie/reachforthesta…
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @petertgallagher is Head of @DIASAstronomy & has spent the past two decades studying the Sun its impacts on the Earth. To learn more and submit an entry see dias.ie/reachforthesta… #DIASdiscovers