Phonon Green's function.

@article{Schwinger1991PhononGF,
  title={Phonon Green's function.},
  author={Julian Seymour Schwinger},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1991},
  volume={88},
  pages={6537 - 6539}
}
  • J. Schwinger
  • Published 1991
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences of the United States of America
The concepts of source and quantum action principle are used to produce the phonon Green's function appropriate for an initial phonon vacuum state. An application to the Mossbauer effect is presented. 
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