[time-nuts] LIGO detects gravitational waves

Magnus Danielson magnus at rubidium.dyndns.org
Sun Feb 14 11:49:10 UTC 2016


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 <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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