Hawking radiation redshift (?)

In summary, the Hawking radiation is initially created at higher frequencies, but appears as infrared due to the red-shifting effects of extreme gravity.
  • #1
Edi
177
1
I think it was proven that firing a photon (laser) straight up from the surface of Earth did in fact redshift the photon and decrease its frequency.
And now, when we consider a black hole and Hawking radiation... I mean - the gravity inside the event horizon is so strong that EM cannot escape and it doesn't make any sense that an inch outside the EV the photon would be free to go. There is still an extreme pull of gravity and any photon flying "up" would be significantly red-shifted.
Now the question is - how much red-shifted it would get? If we receive and infrared photon, then at what frequency it left the event horizon?!

And another thing - ti red this article about "lab event horizon" that had something to do with a piece of glass, short pulses of intense laser and a follow up laser.. or something like that. What they detected was some extra photons in the infra red frequencies associated with Hawking radiation. Its all fine, but - - when we consider that the radiation from real EV would be significantly red-shifted and from that lab EV it wouldn't be - the radiation in the lab should be at much higher frequencies, if it is indeed Hawking radiation.

put it in few words - the Hawking radiation is (as I think) created at higher frequencies, but we receive infra red due to the extreme gravity's red-shift. And the ones in the lab should be higher frequency.

...?
 
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  • #2
Yes, you are correct. The Hawking radiation is created at higher frequencies, however, due to the extreme gravity of a black hole, the radiation is red-shifted and appears at lower frequencies when it reaches us. The Hawking radiation detected in the lab experiment would also be significantly red-shifted, but because the gravity of the lab environment is much weaker than that of a black hole, the frequency of the radiation will not be as drastically reduced as the radiation coming from an actual black hole.
 

What is Hawking radiation redshift?

Hawking radiation redshift is a phenomenon predicted by physicist Stephen Hawking, where particles are emitted from the event horizon of a black hole. These particles have a lower frequency, or longer wavelength, than they would if they were emitted outside of the black hole's gravitational pull. This shift in frequency is known as redshift.

How does Hawking radiation redshift occur?

Hawking radiation redshift occurs because of the intense gravitational pull of a black hole. As particles near the event horizon, they can be split into two virtual particles, with one falling into the black hole and the other escaping. The particle that escapes has a lower energy and therefore a lower frequency, resulting in redshift.

Is Hawking radiation redshift observable?

Yes, Hawking radiation redshift has been observed indirectly through its effects on the temperature and lifespan of black holes. It has also been observed in laboratory experiments using analog black holes.

What is the significance of Hawking radiation redshift?

Hawking radiation redshift is significant because it is one of the few ways that black holes can lose energy and eventually evaporate. This phenomenon also helps to reconcile the laws of thermodynamics with the existence of black holes.

Can Hawking radiation redshift be applied to other objects besides black holes?

While Hawking radiation redshift is most commonly associated with black holes, it can also occur in other objects with intense gravitational fields, such as neutron stars. However, the effect is much smaller and difficult to observe in these cases.

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