Light Entering Black Hole: Hawking Radiation Explained

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SUMMARY

The discussion centers on the behavior of light in the vicinity of a black hole, specifically addressing the phenomenon of redshift and blueshift. When two observers, one at a higher altitude and the other at a lower altitude, shine flashlights at each other, the observer at the higher altitude perceives a redshift due to gravitational effects, while the lower observer perceives a blueshift. This gravitational effect is consistent with the behavior of light near a black hole, where the gravitational influence outside the event horizon mimics that of a star of equivalent mass.

PREREQUISITES
  • Understanding of gravitational redshift and blueshift
  • Familiarity with black hole physics
  • Basic knowledge of general relativity
  • Concept of event horizon
NEXT STEPS
  • Research gravitational redshift and blueshift in detail
  • Explore the properties of black holes and their event horizons
  • Study the implications of general relativity on light behavior
  • Investigate the concept of Hawking radiation and its significance
USEFUL FOR

Astronomy enthusiasts, physicists, and students studying general relativity and black hole phenomena will benefit from this discussion.

Superposed_Cat
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Hi all, I was wondering if, when a beam of light is pulled towards a black hole , because it can't accelerate, it is blueshifted? Thanks in advance.
 
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Hi Superposed_Cat! :smile:

If two people with identical flashlights are stationary at the top and bottom of a mountain, shining the flashlights at each other,

the top person will see the light redshifted, and the bottom person will see the light blueshifted.

It's the same for stationary observers near a black hole …

the gravitational effect of a black hole is (outside the event horizon and outside the surface of the star) exactly the same as that of a star of the same mass.
 
Thanks tiny-tim :). Good day fine sir.
 

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