How do you explain the CMB anisotropy diagram?

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    Cmb Diagram Explain
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SUMMARY

The discussion centers on the Cosmic Microwave Background (CMB) anisotropy diagram, specifically focusing on the significance of multipole moments and the concept of the "opening angle." Participants highlight that the x-axis represents multipole moments, which are crucial for understanding the CMB's physical properties. The mention of values such as "opening angle of 20" indicates a specific measurement relevant to the analysis of CMB data. Overall, the conversation emphasizes the complexity of interpreting these diagrams in cosmology.

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  • Understanding of multipole moments in cosmology
  • Familiarity with the Cosmic Microwave Background (CMB)
  • Basic knowledge of electromagnetic theory
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  • Explore the concept of "opening angle" in cosmological measurements
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Astronomers, cosmologists, and students studying the Cosmic Microwave Background, as well as anyone interested in the mathematical and physical interpretations of cosmological data.

Simfish
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http://map.gsfc.nasa.gov/media/070950/070950b.jpg
So the x-axis is multipole moment, which I remember from 2nd-quarter electromagnetism. Anyways, it surprises me that 1000-order multipole moments can even be physically significant.
 
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I got a professor to explain most of it to me. But I still don't get "opening angle". You supposedly can get a value with an "opening angle of 20". Or 21. Or 22.
 
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