Peter,
The concepts of "event horizon" and "singularities" is somewhat disputed
now.
The "event horizon" is just that radius where the gravitational pull is
strong enough for light to bend down. It's not the "surface" of the
black hole itself. What is interesting here is where the "surface" of
the two black holes meet, as with any binary pair falling into each
other. When the surfaces meet, then the single object core starts to
form and the mass-distribution starts to even out. Now, what would be
really fascinating to study would be just how the dynamic of the black
hole mass acts, as it is under tremendous gravity pull, it will be very
compact and the material behavior there will be "interesting".
The gravity "wave" is the result of the masses shifting in distance from
you, and that is the result of two masses rotating around each other
being pulled by their gravity. The energy being the potential energy
between them, mass M1 have a potential energy in relationship to the
mass M2, due to the height. Since their momentum was not big enough to
pull them apart on a distance, they have slowly been falling towards
each other, those loosing potential energy which is thus emitted.
Notice that neutron stars binary pairs would also be measurable, there
is no big magic to the black holes here except for their enormous mass.
Cheers,
Magnus
On 02/14/2016 05:14 AM, Peter Reilley wrote:
I am curious about the final stages. When they are far apart they are
outside of
each others event horizon (the boundary from which nothing can
escape). As
they wind down the event horizons will merge but not be spherical. They are
hot spherical since the two singularities at their center have not
merged. How
long did it take from the time that the event horizons touched to when the
singularities merged?
Where did the energy of the gravity wave come from? Three solar masses
of energy from what they say. My understanding is that the 2 black holes
started orbiting at some distance and were moving at slow speed. As they
wound
down they picked up speed, ultimately gaining a significant portion of
light speed.
This must have increased their apparent mass. Is this increase in mass
the
same mass that they ultimately lost in radiating the gravity waves?
Once the event horizons merged the singularities continued to orbit each
other and radiate gravity waves. But since the amplitude of the gravity
waves goes down as the spacing decreases will the singularities ever
actually merge? They are infinitely small, so can they ever occupy the
same position and merge?
Pete.
On 2/13/2016 7:14 PM, Bob Camp wrote:
Hi
At least my simple take on it:
As they get closer, the rotation speeds up. It is no different than
the ice skater
pulling in their arms.
Once they get close enough, there are no longer two black holes. They
have become a
single black hole. They now radiate a “dc signal” that the detector
can’t deal with.
Bob
On Feb 13, 2016, at 6:34 PM, Bill Hawkins <[email protected]> wrote:
IMHO, the decay seems backwards because we are watching the growth of
the event as the black holes approach each other, reaching a maximum at
collision.
Don't know why the signal drops off after the collision. May be because
gravity stops changing, or maybe because the resulting object left the
universe - well, not if mass and energy are conserved. Or did the wave
contain all of the radiated energy?
Disclaimer: My field of study was not physics.
Bill Hawkins
-----Original Message-----
From: Bob Stewart
Sent: Saturday, February 13, 2016 2:35 PM
Hi Tom,
Thanks for posting this. I'm looking at the timelab plot, and the only
thing I can relate that to is a musical note played backward. IOW, the
decay seems backwards to me.
Bob - AE6RV
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