[math-fun] BH/BH collision releases 2-3 solar masses of gravity wave energy
30-solar mass black hole coalesces with a 35-solar mass black hole, producing a 62-solar mass hole, giving out 2-3 solar masses worth of gravitational wave energy in approx. 1/5 second ! 76-minute video of the talk Rainer Weiss from MIT recently gave at KITP. It was an excellent talk that explains much about their detection of gravity waves. http://online.kitp.ucsb.edu/online/colloq/weiss1/
Just a stupid question from a non-physicist. The only theoretical mechanism I know of for ejection of mass from a black hole is Hawking radiation, which I understand to be due to quantum effects near the event horizon, and of extremely small magnitude (9*10^-28 watts for an idealized black hole of 1 solar mass). How then does a black hole collision resurrect 3 solar masses of energy from beyond the grave that is the event horizon?
-----Original Message----- From: math-fun [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Henry Baker Sent: Sunday, March 20, 2016 9:28 PM To: math-fun@mailman.xmission.com Subject: [math-fun] BH/BH collision releases 2-3 solar masses of gravity wave energy
30-solar mass black hole coalesces with a 35-solar mass black hole, producing a 62-solar mass hole, giving out 2-3 solar masses worth of gravitational wave energy in approx. 1/5 second !
76-minute video of the talk Rainer Weiss from MIT recently gave at KITP.
It was an excellent talk that explains much about their detection of gravity waves.
http://online.kitp.ucsb.edu/online/colloq/weiss1/
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Gravity waves. On Mon, Mar 28, 2016 at 1:15 PM, David Wilson <davidwwilson@comcast.net> wrote:
Just a stupid question from a non-physicist. The only theoretical mechanism I know of for ejection of mass from a black hole is Hawking radiation, which I understand to be due to quantum effects near the event horizon, and of extremely small magnitude (9*10^-28 watts for an idealized black hole of 1 solar mass). How then does a black hole collision resurrect 3 solar masses of energy from beyond the grave that is the event horizon?
-----Original Message----- From: math-fun [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Henry Baker Sent: Sunday, March 20, 2016 9:28 PM To: math-fun@mailman.xmission.com Subject: [math-fun] BH/BH collision releases 2-3 solar masses of gravity wave energy
30-solar mass black hole coalesces with a 35-solar mass black hole, producing a 62-solar mass hole, giving out 2-3 solar masses worth of gravitational wave energy in approx. 1/5 second !
76-minute video of the talk Rainer Weiss from MIT recently gave at KITP.
It was an excellent talk that explains much about their detection of gravity waves.
http://online.kitp.ucsb.edu/online/colloq/weiss1/
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-- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com
The two black holes have a kinetic energy, and also a gravitational potential energy which binds them into bound orbits. The potential energy is negative, and twice the kinetic energy. This is more-or-less just Newtonian gravity. As the black holes orbit, they emit gravitational radiation. The total energy of the orbiting pair becomes more negative, which means they must spiral in closer to acquire more of that negative binding energy. Hawking radiation is not involved. -- Gene From: David Wilson <davidwwilson@comcast.net> To: 'math-fun' <math-fun@mailman.xmission.com> Sent: Monday, March 28, 2016 1:15 PM Subject: Re: [math-fun] BH/BH collision releases 2-3 solar masses of gravity wave energy Just a stupid question from a non-physicist. The only theoretical mechanism I know of for ejection of mass from a black hole is Hawking radiation, which I understand to be due to quantum effects near the event horizon, and of extremely small magnitude (9*10^-28 watts for an idealized black hole of 1 solar mass). How then does a black hole collision resurrect 3 solar masses of energy from beyond the grave that is the event horizon?
-----Original Message----- From: math-fun [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Henry Baker Sent: Sunday, March 20, 2016 9:28 PM To: math-fun@mailman.xmission.com Subject: [math-fun] BH/BH collision releases 2-3 solar masses of gravity wave energy
30-solar mass black hole coalesces with a 35-solar mass black hole, producing a 62-solar mass hole, giving out 2-3 solar masses worth of gravitational wave energy in approx. 1/5 second !
76-minute video of the talk Rainer Weiss from MIT recently gave at KITP.
It was an excellent talk that explains much about their detection of gravity waves.
participants (4)
-
David Wilson -
Eugene Salamin -
Henry Baker -
Mike Stay