When the photon is born on the horizon .bang?

  • Context: Graduate 
  • Thread starter Thread starter Giulio B.
  • Start date Start date
  • Tags Tags
    Horizon Photon
Click For Summary
SUMMARY

The discussion centers on the behavior of photons generated at the event horizon of a black hole. It is established that a photon strictly at or outside the event horizon can escape, while a photon within the event horizon cannot. The event horizon is defined as a null hypersurface, meaning that a photon located exactly on the horizon can only remain there and cannot escape. This conclusion is supported by the contributions of forum members Warren and George.

PREREQUISITES
  • Understanding of black hole physics
  • Familiarity with the concept of event horizons
  • Basic knowledge of photon behavior in general relativity
  • Comprehension of null hypersurfaces
NEXT STEPS
  • Research the properties of black holes in general relativity
  • Study the concept of null hypersurfaces in advanced physics
  • Learn about the implications of photons at the event horizon
  • Explore the relationship between speed of light and gravitational fields
USEFUL FOR

Physicists, astrophysicists, and students studying general relativity or black hole dynamics will benefit from this discussion.

Giulio B.
when the photon is born on the horizon...bang?

2 electrons are traveling around a black hole, after some time they meet themselves exactly at the horizon of the hole, generating a photon.

if for fate the particle at the moment of be born has a perpendicular speed (opposed relative the center of the black hole), what happends to the photon?

i'm not sure it falls down neither escape, if we suppose it to be at the matematical confine of the horizon , but it must anyway maintain his c speed...:bugeye:
 
Physics news on Phys.org
A photon strictly at or outside the event horizon can escape; a photon inside the event horizon cannot.

- Warren
 
chroot said:
A photon strictly at or outside the event horizon can escape

No, the event horizon is a null hypersurface, so, if a photon is on the horizon, the best that it can do (in terms of "escaping") is to stay on the horizon.

Regards,
George
 

Similar threads

Undergrad Relational event horizons?
  • · Replies 11 ·
Replies
11
Views
2K
High School Photons on a perpendicular bisector path from a black hole's core
  • · Replies 4 ·
Replies
4
Views
2K
High School Theories about light and time near a black hole
  • · Replies 20 ·
Replies
20
Views
3K
Graduate Penrose diagram of black hole with a changing event horizon
  • · Replies 3 ·
Replies
3
Views
4K
High School Kugelblitz at the speed of light misconception
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad The Sub Photon Sphere Escape Game
  • · Replies 8 ·
Replies
8
Views
2K
High School Crashing into an event horizon
  • · Replies 20 ·
Replies
20
Views
2K
Undergrad Can someone fact check my speech about BH?
  • · Replies 19 ·
Replies
19
Views
3K
High School Flashlights and Guns inside an Event Horizon
  • · Replies 24 ·
Replies
24
Views
4K
Undergrad Crossing an Event Horizon: My Experience
  • · Replies 15 ·
Replies
15
Views
2K