What Is Space in Physics?

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SUMMARY

The discussion centers on the concept of space in physics, particularly within the framework of general relativity. Space-time is described as a dynamic entity influenced by mass and energy, which can cause curvature. The conversation explores various models of the universe, including open, closed, and flat universes, emphasizing that current observations suggest our universe is flat. Key terminology includes 'de Sitter universe' and 'Weyl curvature tensor', which are essential for understanding the curvature of space-time in the absence of matter.

PREREQUISITES
  • Understanding of general relativity and its implications on space-time.
  • Familiarity with cosmological models: open, closed, and flat universes.
  • Knowledge of the Weyl curvature tensor and its significance in physics.
  • Basic concepts of dark energy and its role in the universe's expansion.
NEXT STEPS
  • Research the implications of the Weyl curvature tensor in general relativity.
  • Study the characteristics and differences between open, closed, and flat universe models.
  • Explore the concept of the de Sitter universe and its relevance in cosmology.
  • Investigate the role of dark energy in the universe's expansion and its observational evidence.
USEFUL FOR

Students of physics, cosmologists, and anyone interested in the fundamental nature of space-time and the universe's structure.

  • #31
Light Bearer said:
"Space has no objective existence whatsoever in the same way that ponderable matter does.

In GR, it does.

Light Bearer said:
It is also a void through which force carriers can propagate, but it is the characteristics of the force carriers which determine the way in which they behave and interact with ponderable matter. I believe that this is the most modern view and it replaces the older concepts of space being an aether with properties of its own."

You're talking about the idea of graviton fields replacing spacetime? Certainly a modern treatment of space and gravity, though we haven't found any gravitons, nor come up with one widely accepted theory yet.
 

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