On Tuesday, November 5, 2019 at 8:22:54 AM UTC-6, Alan Grayson wrote:
>
>
>
> On Tuesday, November 5, 2019 at 6:46:46 AM UTC-7, Lawrence Crowell wrote:
>>
>> On Monday, November 4, 2019 at 7:56:55 PM UTC-6, Alan Grayson wrote:
>>>
>>> According to QM, does time stop at the event horizon of a BH? TIA, AG
>>>
>>
>> There is no time on the horizon for particle geodesics on the horizon.
>> These can only be photons, which as null geodesic particles have zero
>> proper time.
>>
>> LC
>>
>
> Isn't that a singularity of sorts; not one involving infinity, but still a
> baffling result that time stops? What happens to time when one crosses the
> horizon? AG
>
Crossing the horizon is a nonevent for the most part. If you try to
accelerate so you hover just above it the time dilation and that you are in
an extreme Rindler wedge will mean you are subjected to a torrent of
radiation. In principle a probe could accelerate to 10^{53}m/s^2 and hover
a Planck unit distance above the horizon. You would be at the stretched
horizon. This would be almost a sort of singular event. On the other hand
if you fall on an inertial frame inwards there is nothing unusual at the
horizon.
LC
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