You can't have a monopole wave in gravity. So how would a simple direct
collapse create a gravitational wave? Just small anisotropies?
Brent
On 1/22/2020 12:46 PM, John Clark wrote:
At 9:02:11 PM Eastern Standard Time on Monday January 13 the 2 LIGO
detectors in the USA and the VIRGO detector in Italy noticed an
unusual Gravitational Wave, unlike merging Neutron Stars that produce
waves that last about 30 seconds and merging stellar mass Black Holes
that last about a second this one only lasted for 14 milliseconds.
Nobody is quite sure what caused it, the best guess is a unnovae, they
have been observed optically a few times in stars too large to go
supernova and instead collapse directly into Black Holes and just turn
off; no supernova has ever been observed from a star larger than 18
solar masses although stars well over 100 solar masses exist. As it
happened this event occurred on a area in the sky near to but not
precisely at Betelgeuse's location, but Betelgeuse is still there and
probably isn't massive enough to be a unnovae, its eventual fate is
probably just a boring old Supernova. And the wave could be caused by
something else, 14 milliseconds is pretty short even for a unnovae.
Gravitational-Wave Candidate Event Database
<https://gracedb.ligo.org/superevents/S200114f/>
John K Clark
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