
#1
Nov2312, 11:19 PM

P: 18

As we know, the gravitational pull of the black hole is too strong, not even light can escape from it...
Let me assume 2 person: A and B A is sucked into a black hole while B is outside the event horizon... At first, B will notice that A has disappeared due to the lights(image) of A is sucked by the black hole... On the other hand, A will still see the image of B because the lights(image) of B is being sucked into the black hole. What this all mean? Do this event relates to relativity which both of them are in different inertial frame causing things which they observed to differs? Thanks for spending your time reading the entire post...*(it's quite long)...haha 



#2
Nov2312, 11:48 PM

PF Gold
P: 5,674

You are correct that A will continue to see B, even after A passes the event horizon 



#3
Nov2312, 11:49 PM

P: 2,471

my understanding is that A will appear to hover on the event horizon and will never be observed falling in. From A's perspective though, A will pass the event horizon and continue the fall being stretched out like taffy due to gravitational tidal effects.
http://www.slate.com/articles/news_a...lack_hole.html and in more detail: http://math.ucr.edu/home/baez/physic...s/fall_in.html 



#4
Nov2312, 11:57 PM

PF Gold
P: 5,674

What events occur inside a black hole?The sphagettification may occur either inside or outside the BH, depending on its size. 



#5
Nov2412, 12:00 AM

P: 2,471





#6
Nov2412, 12:07 AM

PF Gold
P: 5,674





#7
Nov2412, 12:11 AM

P: 2,471





#8
Nov2412, 07:58 PM

P: 7

No events occur inside a black hole because black holes don't have an interior.




#9
Nov2412, 08:03 PM

PF Gold
P: 5,674





#10
Nov2412, 09:00 PM

P: 7

"inside the event horizon" can't be made rigorous, if only because the notion of event horizon( assuming it can be made rigorous) is no more rigorous than the notion of BH interior since an event horizon is an asymptotic limit of future null infinity. In the usual OpSnyVolk representation of Schwarz that's where the radial coordinate magically turns into the temporal coordinate. At that point you don't know where you are! Next to nonsense, or in it?




#11
Nov2412, 09:39 PM

Mentor
P: 16,466

Also, there are several coordinate charts that are well behaved at the EH, so the failure of one is clearly a problem with those coordinates, not the EH itself. 



#12
Nov2412, 10:29 PM

P: 7

Your "region" can't be well defined since its domain is rest of universe. A singularity or BH can only make sense when it's approached from asymptotic spatial infinity and an effective approach may not be complete in the assumed metric. So I would ask you where in the approach is the path without timelike vector?




#13
Nov2412, 11:35 PM

Sci Advisor
Thanks
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#14
Nov2512, 07:23 AM

Mentor
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