LIGO announces another detection GW170104

AgentB
AgentB
Joined: 17 Mar 12
Posts: 915
Credit: 513,211,304
RAC: 0
Mike Hewson
Mike Hewson
Moderator
Joined: 1 Dec 05
Posts: 6,043
Credit: 105,820,333
RAC: 51,558

Cheers, Mike.

mr_burns.gif

Quick check : I can't see a sigma statistic quoted but the probability rate ( with assumptions ) converts to roughly 5.5 :-)

LOL : the bounding of the graviton mass will please some, make others unhappy, and confuse the rest ! :-)

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Winterknight
Winterknight
Joined: 4 Jun 05
Posts: 478
Credit: 77,642,739
RAC: 16,207

This latest hit the

This latest hit the Washington Post yesterday afternoon (their time), although I just found it.

Scientists detect gravitational waves from black holes colliding 3 billion light-years from Earth

Shawn Kwang
Shawn Kwang
Moderator
Administrator
Joined: 3 Nov 15
Posts: 276
Credit: 711,450
RAC: 405

AgentB wrote: Comparison of

AgentB, this link is broken. 

Einstein@Home Project

AgentB
AgentB
Joined: 17 Mar 12
Posts: 915
Credit: 513,211,304
RAC: 0

Shawn Kwang wrote:AgentB,

Shawn Kwang wrote:
AgentB, this link is broken. 

Yes it is, in my excitement ...  let me retry

 Comparison of the gravitational wave events GW150914 and GW170104

 

astro-marwil
astro-marwil
Joined: 28 May 05
Posts: 426
Credit: 149,029,774
RAC: 5,023

Hallo! It´s great

Hallo!

It´s great indeed!

Specially, because there are probably up to 5 more events in the pipeline.

But, why is there no note in BOINC Manager/Notes ?

 

Kind regards and happy crunching

Martin

Mike Hewson
Mike Hewson
Moderator
Joined: 1 Dec 05
Posts: 6,043
Credit: 105,820,333
RAC: 51,558

There is much discussion

There is much discussion about the spins of the holes. This has a significant effect on the 'death spiral' which is either quicker or slower depending upon the mutual spin orientations ie. one can constrain those according to the timing of the final orbits. Interestingly the combined hole has a spin parameter of 0.64, this being a dimensionless number that compares to the maximal ( which would be 1.0 ). In effect this means that points on the event horizon are scooting around at approximately two thirds of the speed of light. What a vortex around the plug hole this is ! Given that the hole's surface is barely a thousand kilometers around* then anything in-falling would be a mere instantaneous smear before being gone forever. Wow. That's what I call a Black Hole Blender or the Ultimate Angle Grinder. :-))

Cheers, Mike.

* Black hole 'radius' goes like 3km per solar mass, so diameter 6km per solar mass, 60 solar masses is thus 6 x 60 = 360 km, for ( apparent ) circumference multiply by PI => ~ 1100 km. Time = distance/velocity = 1100/[0.64 x 300000] ~ 6 milliseconds to go around the circumference once ( as viewed from a distance ). I'm ignoring that such a fast hole would be an oblate spheroid, fatter at it's equator c/w pole to pole .....

( edit ) FWIW : there is an eerie analogy b/w black hole spins and magnetic particles, when seen in pairs. The system energy in both cases is lower when the spins are aligned anti-parallel and higher when parallel. There are other correspondences too, which has prompted some to say that subatomic particles are tiny black holes ..... but in detail no one has made the theory work yet.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.