Why Does Matter Cause Space to Warp?

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Discussion Overview

The discussion centers around the question of why matter causes space to warp, particularly in the context of gravity as described by general relativity (GR). Participants explore various visualizations and conceptualizations of gravity, ranging from particle interactions to larger-scale effects, while seeking an intuitive understanding of the phenomenon.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant visualizes gravity as particles "pinching" space, suggesting that the accumulation of particles leads to gravitational attraction through warped space.
  • Another participant questions the concept of "pinching" space, asking for clarification on how this visualization aids in understanding gravity.
  • Some participants argue that while the visualization attempts to explain gravity at a particle scale, it does not provide a better explanation than GR, which offers clear mathematical descriptions.
  • There is a discussion about the scale at which gravity operates, with some asserting that gravity exists at all scales, while others suggest it is only significant above certain scales due to the accumulation of particles.
  • One participant acknowledges that every atom warps spacetime, and accumulating a vast number of atoms results in significant warping, but questions the original visualization's effectiveness.
  • Concerns are raised about speculative ideas and the need for quantitative backing to support claims made in the discussion.
  • Despite various viewpoints, the question of why matter warps space remains unresolved, with participants expressing differing opinions on the validity of the proposed models.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the visualization of gravity and the underlying mechanics of how matter causes space to warp. The discussion remains unresolved, with no consensus reached on the effectiveness of the proposed explanations.

Contextual Notes

Some participants highlight the limitations of the original visualization, questioning its clarity and its ability to provide a quantitative understanding of gravity. There are also references to the need for adherence to forum policies regarding speculative posts.

  • #31
Alright.
 
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  • #32
I don't think the OP got a fair hearing. Pinch is maybe a bit too loose in terminology. Let's try to read his mind.

If I might speak for his notion, GR says that a stress-energy tensor is the source of gravity. Traditionally you'd lump in there all forms of energy including rest masses of particles, electric field stresses, etc. Yes, even the electron is a source of gravity in GR, with m0c^2 in the T00 term and it's electric field in the EM tensor, nonzero at least along the diagonal in a rest frame I think.

Now *if* you postulated that space-time had a certain energy density and *if* you assumed that the particle masses and EM energy densities had their origin in this same energy density (Higgs?) and *if* space-time were an elastic medium such that concentrating some of it ("pinching") meant straining it near the pinch in accord with the Einstein equation, *then* maybe the pinch model might be onto something. I think maybe one of these assumption has a case. Most are not going to hold any water.

At best it's a nice mental extension of the overused rubber sheet analogy. I like it but I don't think it works.
 
  • #33
I hope my posts did not come off as disrespectful. I appreciate the link Zapper, and the input from you Vanadium. My communications skills are not the best. My girlfriend even thinks I'm mildly autistic. Anyway, if anyone reading this happens to come across anything related to what I posted in post #28, please feel free to send me a pm. Also, I did not mean to hijack the thread. I think what I brought up is very much related to the OP "Fundamental source of gravity", just not in the GR conceptualization.
 
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