A Poor Man's CMB Primer Part 0: Orientation - Comments

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SUMMARY

The discussion centers on the curvature of space in relation to cosmological models, specifically addressing the claims made in "A Poor Man's CMB Primer." Participants assert that while spacetime is curved, space itself is effectively flat based on observational data, as noted by Hornbein. The curvature of space has been calculated and found to be negligible, which supports the validity of the discussed cosmological models. The conversation highlights the importance of understanding the distinction between spacetime and spatial curvature in cosmology.

PREREQUISITES
  • Understanding of cosmological models and the Cosmic Microwave Background (CMB)
  • Familiarity with spacetime concepts in general relativity
  • Knowledge of observational cosmology and curvature measurements
  • Basic grasp of geometry in the context of physics
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  • Research the implications of flat space in cosmological models
  • Study the methods used for measuring spatial curvature in cosmology
  • Learn about the Cosmic Microwave Background and its significance in cosmology
  • Explore general relativity and its treatment of spacetime versus space
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Astronomers, physicists, and students of cosmology who are interested in the implications of space curvature on cosmological models and the understanding of the universe's structure.

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A Poor Man's CMB Primer. Part 1: Orientation

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But is space is curved, wouldn't this model be incorrect? Surely on this scale any curvature would be significant
 
AgentSmith said:
But is space is curved, wouldn't this model be incorrect? Surely on this scale any curvature would be significant
The curvature has been calculated from observations. It was not measurably different from zero.
 
AgentSmith said:
space is curved

Spacetime is curved, but space, as far as we can tell, is flat, as Hornbein says (the curvature he refers to is space curvature, or more precisely the curvature of spacelike slices which are surfaces of constant time in standard cosmological coordinates).
 
AgentSmith said:
But is space is curved, wouldn't this model be incorrect? Surely on this scale any curvature would be significant
As others have commented, space has been measured to be rather flat; however, I don't see how geometry factors into anything discussed in this post. Where do you think it fits in?
 

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