Light Behavior in Black Holes: Exploring Curved Space-Time

[Giuliano97]

Good morning everyone, I'm Giuliano and I would like to know how light behaves in a black hole and because it can not get out.
More precisely, i understand that light moves in curved space-time format from the black hole, but once passed within swarzchild radius the photon is expected to impact the superdense mass of the black hole , or can not get out because it does not have enough energy to climb the spacetime curvature and ends up to " stretch " within he has no more energy.
sorry for my ignorance and for my english and thanks in advance.

 

[RyanH42]

If a light beam goes into a black hole it can never go out.What happens to it.The photon energy increases the mass of black hole.Every energy fallen into blak hole makes it heavier.

 

[phinds]

i understand that light moves in curved space-time format from the black hole

yes

but once passed within swarzchild radius the photon is expected to impact the superdense mass of the black hole

yes

, or can not get out because it does not have enough energy to climb the spacetime curvature

yes

and ends up to " stretch " within he has no more energy.

Don't understand what you mean here.

 

[Giuliano97]

@phinds
i mean that its wavelength would be lengthened

 

[phinds]

@phinds
i mean that its wavelength would be lengthened

@phinds
i mean that its wavelength would be lengthened

OK, but what's with the "no more energy" ?

As a beam of light approaches a black hole, it becomes blue shifted from the point of view of someone closer to the black hole and I suppose that process continues past the event horizon, but I don't see the energy going to zero.

 

[Giuliano97]

@phinds
thank you for your answer,
As i know photons becomes blue shifted when they enter in the black hole and a red shift when they try to escape from it .
A photon that was born exactly on the horizon of events , directed towards the outside of the black hole , would suffer an infinite red shift so its wavelength would be lengthened to infinite (his energy would become zero ) .
Sorry for my english again..

 

[Nugatory]

As i know photons becomes blue shifted when they enter in the black hole and a red shift when they try to escape from it .

Relative to an observer outside the event horizon, yes.
[quote]
A photon that was born exactly on the horizon of events , directed towards the outside of the black hole , would suffer an infinite red shift so its wavelength would be lengthened to infinite (his energy would become zero ) .
[/QUOTE]
That's not quite right. It will never reach an observer outside the event horizon, so there is no meaningful way of talking about its red shift relative to such an observer.

 

[Giuliano97]

@Nugatory
I agree, but although we can not see the actual redshift of light , we can still take the redshift and the stretching of the wavelength as due to lack of leakage of light from a black hole ?