[ExI] A odd Gravitational Wave
avant at sollegro.com
Sat Jan 25 17:54:49 UTC 2020
Quoting John Clark:
>> * > I don't see how an isotropic gravitational collapse could cause
>> gravitational waves. I thought the generation of gravitational waves
>> required a dipole or quadripole or some kind of asymmetry.*
> True, the collapse would have to be very asymmetrical , and I admit that
> seems a bit unlikely.
>> * > But if it wasn't a failed supernova, then I have no idea what could
>> have caused such a short powerful burst of gravitational waves. Very
>> mysterious indeed.*
> I was thinking maybe 2 sub solar mass Black Holes coalescing. That would be
> really cool if true. Black Holes that small would pretty much have to be
> primordial, I can't think of anything except the Big Bang itself that would
> have conditions extreme enough to produce them.
But the burst was so short, only 14 milliseconds. That is shorter than
both the typical signals of the usual stellar black hole collisions
which are on the order of a couple of seconds and neutron star
collisions which are on the order of 30 seconds.
According to space.com:
"Another possibility is that the merging of two intermediate-mass
black holes caused the signal, Howell said. Merging neutron stars
produce waves that last longer (around 30 seconds) than this new
signal, while merging black holes might more closely resemble bursts
(that last around a couple of seconds). However, intermediate black
hole mergers might also release a series of waves that change in
Wouldn't it be cool if the signal was an advanced civilization that
activated an Alcubierre drive powered by a mountain-massed microscopic
black hole in order to escape the imminent supernova of Betelguese?
LIGO hasn't released the frequency/shape of the signal yet so, it is
all just speculation anyway.
Gravitational wave astronomy is such cool stuff. It is like a
renaissance in astrophysics and I seriously think that it will lead us
to a theory of quantum gravity someday.
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