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More black-hole mergers from LIGO–Virgo

13 Apr 2019, 22:55 UTC
More black-hole mergers from LIGO–Virgo
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From the APS April Meeting in Denver, Colorado
The April Meeting of the American Physical Society kicked off today with about 1600 particle, nuclear and astrophysicists gathering in Denver, Colorado. I thought I would start the conference by learning a bit more about the other big black-hole news story this month – the 1 April start-up of the upgraded LIGO and Virgo gravitational wave detectors.
From what I heard in a session called “What we are learning from the population of detected binary black hole mergers“, in less than two weeks the detectors have already bagged two potential black-hole merger events, so the future looks promising.

Indeed, according to Eva Huang of MIT, several black-hole mergers per month should be seen by the detectors — and up to one neutron star merger per month as well.
But what can we learn from the 10 black-hole mergers already spotted, as well as from the many more likely to come?
One important measurement is the rate at which these mergers occur in the universe, which was the subject of a talk by Shasvath Kapadia of the University of Wisconsin — Milwaukee. Knowing this rate should yield a wealth of information about how ...

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