Writing sin^2 theta * Sin 2 phi in terms of spherical Harmonics

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SUMMARY

The discussion focuses on expressing the term "Sin^2 theta * Sin 2 phi" using spherical harmonics, specifically combining Y(2,-2) and Y(2,2). The user encounters an issue where the resulting expression includes the imaginary unit 'i', leading to complex eigenvalues in their Hamiltonian analysis. This indicates a potential error in the transformation process or assumptions made during the derivation.

PREREQUISITES
  • Understanding of spherical harmonics, specifically Y(2,-2) and Y(2,2)
  • Familiarity with Hamiltonian mechanics and eigenvalue problems
  • Knowledge of trigonometric identities, particularly Sin^2 and Sin 2
  • Basic complex number theory and its application in quantum mechanics
NEXT STEPS
  • Review the derivation of spherical harmonics and their properties
  • Study the relationship between trigonometric functions and spherical harmonics
  • Examine Hamiltonian systems and the implications of complex eigenvalues
  • Learn about the role of complex numbers in quantum mechanics and wave functions
USEFUL FOR

Physicists, mathematicians, and students working on quantum mechanics, particularly those dealing with Hamiltonians and spherical harmonics.

Physicslad78
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I am trying to write the term "Sin^2 theta * Sin 2 phi" in terms of spherical Harmonics (they form a combination of Y(2,-2) and Y(2,2)) but the term I get contains the imaginary number 'i'. Am I doing something wrong.. In fact this term is a part of a Hamiltonian and when I get the eigenvalues I find that some are complex! What is happening?


Thanks
 
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It is very hard to tell what you are doing wrong if you don't show explicit the work you have done and how you motivate the steps.
 

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