What kind of topology change does this Lorentzian metric describe?

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SUMMARY

The discussion centers on the Lorentzian metric presented in a specific paper, focusing on its implications for spatial topology changes, particularly the transition from connectedness to disconnectedness over time. The participants debate the nature of the topology change, identifying it as a transformation from a state of 'nothing' to a wormhole represented by the topology ##S^1\times S^2##. The periodicity of time, denoted as ##t##, is also questioned, with ##t=0## indicating the absence of structure and ##t=1## marking the formation of the ##S^3## wormhole.

PREREQUISITES
  • Understanding of Lorentzian metrics in general relativity
  • Familiarity with topological spaces, specifically ##S^1##, ##S^2##, and ##S^3##
  • Knowledge of wormhole theory and its implications in physics
  • Basic grasp of periodic functions and their applications in physics
NEXT STEPS
  • Research the properties of Lorentzian metrics in general relativity
  • Study the implications of topology changes in cosmological models
  • Explore the concept of wormholes and their mathematical representations
  • Investigate periodic time dimensions in theoretical physics
USEFUL FOR

The discussion is beneficial for theoretical physicists, mathematicians specializing in topology, and students studying general relativity and cosmology.

Onyx
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What kind of topology change does this Lorentzian metric describe?
Looking at this paper, what sort of spatial topology change does the lorentzian metric (the first one presented) describe? Does it describe the transition from spatial connectedness to disconnectedness with time? All I know is that there is some topology change involved, but I don’t see the paper specifying what kind. Also, why is ##t## periodic? That seems very unusual to me.
 
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Which one do you call the first example? The one that says that it is Wheeler's beloved wormhole? Then it describes the change from nothing to a wormhole ##S^1\times S^2##.
 
No, when I say the first example, I mean number 7, the Lorentzian metric with the off-diagonal entries.
 
Onyx said:
No, when I say the first example, I mean number 7, the Lorentzian metric with the off-diagonal entries.
That is the same example!
 
martinbn said:
That is the same example!
Oh, my bad.
 
Onyx said:
Oh, my bad.
Well then I suppose ##t=0## represents nothing and ##t=1## represents the ##S^3## wormhole having formed.
 

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