Why Do We Get an Einstein Cross Instead of a Skewed Ring?

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SUMMARY

The discussion centers on the phenomenon of Einstein crosses, which occur due to specific alignment conditions in gravitational lensing. Participants reference Hartle's book, "Gravity: An Introduction to Einstein's General Relativity," as a valuable resource for understanding the mechanics behind this phenomenon. The distinction between an Einstein cross and a skewed ring is clarified, emphasizing that the cross formation results from precise alignment rather than mere distortion.

PREREQUISITES
  • Understanding of gravitational lensing principles
  • Familiarity with Einstein's General Relativity
  • Knowledge of optical phenomena in astrophysics
  • Basic concepts of light propagation in curved spacetime
NEXT STEPS
  • Read Hartle's "Gravity: An Introduction to Einstein's General Relativity"
  • Explore the mathematical framework of gravitational lensing
  • Investigate the conditions leading to different lensing configurations
  • Study observational techniques for detecting Einstein crosses
USEFUL FOR

Astronomers, astrophysicists, and students of general relativity seeking to deepen their understanding of gravitational lensing phenomena.

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Why do we ever get Einstein crosses? I realize it is because the alignment is not right, but why do we get a cross because of this instead of just a skewed ring?

Thanks,
Jamie
 
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Unredeemed said:
Why do we ever get Einstein crosses? I realize it is because the alignment is not right, but why do we get a cross because of this instead of just a skewed ring?

Thanks,
Jamie

Hartle's book Gravity: An Introduction to Einstein's General Relativity has a nice treatment of this. I can look it up on Monday.
 
George Jones said:
Hartle's book Gravity: An Introduction to Einstein's General Relativity has a nice treatment of this. I can look it up on Monday.

That would be great, thank you.
 

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