Does spacetime could curved in a square way ?

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Discussion Overview

The discussion centers around the hypothetical scenario of a square mass object and its implications for the curvature of spacetime according to General Relativity (GR). Participants explore the feasibility of applying GR to non-spherical shapes and the nature of spacetime curvature in such cases.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions whether spacetime could curve in a "square way" due to the hypothetical nature of a square mass object, suggesting that GR is defined on a smooth manifold.
  • Another participant argues that postulating an impossible situation limits the applicability of GR, implying that GR would reject the scenario outright.
  • A different viewpoint suggests that GR can be applied to any shape of object, including a square mass, and that the distortion of spacetime would be similar to that of a spherical object at a distance, though closer to the object the curvature would be influenced by its shape.
  • This participant also notes that while real objects cannot be perfectly square, any measurement of spacetime curvature would smooth out at a distance, preventing discontinuities.
  • A later reply expresses satisfaction with this explanation, indicating it addresses their inquiry.

Areas of Agreement / Disagreement

Participants express differing views on the implications of a square mass object for spacetime curvature. There is no consensus on whether the scenario is meaningful within the framework of GR, as some argue it is impossible while others suggest it can be analyzed.

Contextual Notes

The discussion highlights limitations in the assumptions made about the nature of mass objects and the applicability of GR to non-standard shapes. The implications of these assumptions on the analysis of spacetime curvature remain unresolved.

Who May Find This Useful

This discussion may be of interest to those exploring theoretical physics, particularly in the context of General Relativity and the nature of spacetime. It may also appeal to individuals curious about the implications of non-standard mass shapes in gravitational theory.

hamilton00989
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Does spacetime could curved in a "square way"?

Suppose there is a square mass object in the universe (I know its impossible, but suppose...).
Does spacetime will curved in a "square way"?
I believe that not as GR is defined on a smooth manifold.
Am I right?
 
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hamilton00989 said:
Suppose there is a square mass object in the universe (I know its impossible, but suppose...).
Does spacetime will curved in a "square way"?
I believe that not as GR is defined on a smooth manifold.
Am I right?
When you start off by postulating an impossible situation there is no point in asking what GR would say- it would say "that is impossible"!
 


What exactly is impossible about a square mass object?

You mean a massive cube, right? Or a very flat square pancake? In any case, you can apply GR to any shape of object, the distortion of space-time at a distance will be about the same as for a spherical object, but closer by the curvature will be influenced by the shape. Nothing stops you from simply integrating over the volume, I don't see the problem.

Of course a real object can't be perfectly square, since atoms are sort of round, but even if it was, any measurement of space-time curvature would be at some non-zero distance from the object, so everything already starts smoothing out a bit, and there will be no discontinuities. Is that the answer you were looking for?
 


Yes, this is the answer I have been looking for.
Thanks a lot!
 

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