On Friday, November 8, 2019 at 12:42:40 AM UTC-6, Alan Grayson wrote:
>
>
>
>> You don't see a problem with a theory that predicts a clock which stops 
>> as seen by an outside observer, when the observer using the clock, which 
>> measures proper time, must see it moving forward?  AG
>>
>>
>> No.  Why should it be a problem?  You're watching the clock approach the 
>> event horizon and the photons from it come further and further apart until 
>> you have to wait seconds between photons, and then hours, and then days, 
>> and years...why because they have to travel thru more spacetime.  If it's a 
>> rotating black hole, as most of them will be, each photon will have to 
>> orbit many times on it's way out.
>>
>> Brent
>>
>
> If clock which is fixed some distance from the EH, and the BH isn't 
> rotating, why must the photons traveling to the fixed observer have to 
> travel progressively longer times? AG 
>



Keep in mind that all this (deducing what happens in physical reality from 
the mathematics) all depends  on what mathematics one begins with.

Starting instead with a LQG-type mathematics, one might have a bouncing 
clock that slows until it bounces - going backwards in time.


*Crossing the event horizon with Loop Quantum Gravity*

*Loosely speaking, the full phenomenon is analogous to the bouncing of a 
ball. A ball falls to the ground, bounces, and then moves up. The upward 
motion after the bounce is the time-reversed version of the falling ball. 
Similarly, a black hole “bounces” and emerges as its time-reversed 
version—the definition of a white hole.*

https://resonancescience.org/crossing-the-event-horizon-with-loop-quantum-gravity/

@philipthrift

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