When do the laws of general relativity breakdown?

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Discussion Overview

The discussion revolves around the conditions under which the laws of general relativity (GR) may break down and the transition to quantum mechanics (QM). Participants explore whether there is a specific point or size at which this transition occurs, or if it is a more gradual process. The conversation touches on theoretical implications and the relationship between GR and QM, particularly in extreme conditions like black holes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants express uncertainty about when GR breaks down and QM takes over, noting that there is currently no experimental data that definitively shows a breakdown of GR.
  • One participant suggests that inside a black hole, GR and QM are in conflict, indicating a potential breakdown of one or both theories in such extreme conditions.
  • Another viewpoint proposes that the transition occurs as one approaches the sub-atomic level, although this is not universally accepted.
  • A participant mentions that there is no contradiction between GR and QM under ordinary conditions, such as those found in Earth laboratories.
  • One participant references a previous discussion on relativity's effects, suggesting that GR has implications beyond just large-scale phenomena.

Areas of Agreement / Disagreement

Participants do not reach a consensus on when GR breaks down in favor of QM. Multiple competing views are presented, with some suggesting specific conditions (like black holes or sub-atomic levels) while others emphasize the lack of definitive evidence.

Contextual Notes

The discussion highlights limitations in current understanding, particularly regarding the lack of experimental data on gravitational effects that could indicate a breakdown of GR. The relationship between GR and QM remains unresolved, with various assumptions and definitions at play.

joebloggs
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Ok, firstly I just want to say I have a layman's interest in physics. But from my limited understanding physicists use the theory of general relativity to understand big things like stars and galaxies and use quantum mechanics to understand the very small things like atoms and sub-atomic particles. My question is when does general relativity breakdown and quantum mechanics take over? Is there some critical size or point this happens? Or is it a gradual progression? I hope these questions make sense :).
 
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joebloggs said:
when does general relativity breakdown and quantum mechanics take over?

We don't know yet. As far as I know, there is as yet no experimental data on gravitation that unambiguously shows a breakdown of GR.
 
My question is when does general relativity breakdown and quantum mechanics take over?
Inside a black hole these theories are in conflict. This implies that there is a breakdown in one or the other or both.
 
joebloggs said:
Ok, firstly I just want to say I have a layman's interest in physics. But from my limited understanding physicists use the theory of general relativity to understand big things like stars and galaxies and use quantum mechanics to understand the very small things like atoms and sub-atomic particles. My question is when does general relativity breakdown and quantum mechanics take over? Is there some critical size or point this happens? Or is it a gradual progression? I hope these questions make sense :).

I always thought it was when you approach the sub-atomic level.
 
befragen said:
I always thought it was when you approach the sub-atomic level.
There is no contradiction under ordinary (outside of black holes) conditions, such as in any Earth lab.
 
I recently asked a similar question on this forum. Relativity is responsible for a lot of interesting effects such as the color of gold and the liquid state of mercury. If you go back a page or two you should be able to find my thread; there are some pretty interesting responses and links.
 

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