Has LIGO-Virgo detected primordial black holes?

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• Christian Byrnes, University of Sussex
• Wednesday 27 January 2021, 14:00-15:00
• online .

If you have a question about this talk, please contact Nicola Giacobbo.

PhD meet & greet at 12.30

Although black holes can be the remnants of dead stars, it is also possible that some are primordial. Such primordial black holes are the unique dark matter candidate which is not a new type of particle, and they could also explain some of the unexpected properties of the black hole mergers that LIGO has detected. I will summarise the evidence and challenges behind this claim, including a new Bayesian model comparison between astrophysical and primordial black holes. Finally, I will discuss the interesting coincidence of scales between the LIGO , the Chandrasekhar mass, the horizon mass during the QCD transition in the early universe, and the wavelength of gravitational waves on which NANO Grav may (just maybe) have detected a stochastic gravitational wave background.

This talk is part of the Astrophysics Talks Series series.

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• Astrophysics Talks Series
• Bham Talks
• What's on in Physics?
• online

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