[time-nuts] LIGO detects gravitational waves

[Peter Reilley]

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 <bill.iaxs at pobox.com> 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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