Is only GR enough for proved the event horizon

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Discussion Overview

The discussion centers around the question of whether General Relativity (GR) is sufficient to demonstrate that nothing can escape from a black hole's event horizon, or if string theory is necessary for this proof. The scope includes theoretical considerations related to black holes and the application of different physical theories.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant asserts that using GR is adequate to show that nothing can escape from a black hole's event horizon, challenging the necessity of string theory.
  • Another participant questions the professor's insistence on string theory, suggesting that the requirement may depend on the context or purpose of the inquiry.
  • A different viewpoint expresses skepticism about the utility of string theory in proving concepts related to black holes, labeling it as an exercise in futility.
  • A participant indicates that their project is a high school endeavor and that they have not studied string theory, seeking clarity on GR's implications regarding black holes.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of string theory for understanding black holes, indicating that multiple competing perspectives remain without a consensus on the issue.

Contextual Notes

Some participants highlight the historical context of black hole theories, noting that their existence predates string theory, which may influence the discussion about the necessity of different theoretical frameworks.

hypernova
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I do a little project about photon at the event horizon. I use GR to proved that anything in the event horizon can't escape from black hole, but a Prof. say that I must use string theory.But I did't accept with him.So, if someone know about it.Please Help me :cry: .

(I have to tell you that I'm thai people so my english may terrible.Please Forgive me for that.And if someone already ask this question, I'm sorry for ask it again.But I didn't find it anywhere in the forum)
 
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Why does he say you have to use string theory?

Are you taking a string theory course?

Is he a string theory professor?

For what purpose are you working on this problem? For some purposes just getting the answer would be enough, but for other purposes, like learning to do string physics, you would have to use a particular method.

ADDED: Here is a set of introductory lecture note on black holes and string theory. http://arxiv.org/PS_cache/hep-th/pdf/9901/9901050.pdf . I found it by searching on the four words photon string black hole with google scholar.
 
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hypernova said:
I do a little project about photon at the event horizon. I use GR to proved that anything in the event horizon can't escape from black hole, but a Prof. say that I must use string theory.But I did't accept with him.So, if someone know about it.Please Help me :cry: .

(I have to tell you that I'm thai people so my english may terrible.Please Forgive me for that.And if someone already ask this question, I'm sorry for ask it again.But I didn't find it anywhere in the forum)
The existence and description of black holes have been around since before string theory existed. In no way does one have to use string theory to prove anything in relativity.

Pete
 
You can use string theory to 'prove' just about anything. I consider it an exercise in futility.
 
Thank you everyone for your answer.I'll do more research.
My project is just a high school project and I didn't learn any of string in class. I just want to know how GR tell us that it's not have anything that can escape from black hole.
 

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