College Physics ›› 2023, Vol. 42 ›› Issue (8): 1-.doi: 10.16854/j.cnki.1000-0712.220596
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YANG Shi-jie
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Abstract: The paper systemically describes the fundamental principle of the Green,s function method. It demonstrates that the reversal relation holds only for the case of self-adjoint operator. The homogeneous boundary condition of the Green,s function also comes from the self-adjointness of the differential operator while the Green integral formula does not directly apply to the non-self-adjoint operator. The paper also addresses perturbation expansion method induced by the Green,s function, shows its relation to the popular Feynman diagram technique in physical science so as to help the student understanding the internal logics when learning advanced physics.
Key words: Green,s function, self-adjoint operator, boundary condition, perturbation expansion
YANG Shi-jie. Notes on the Green,s function method[J].College Physics, 2023, 42(8): 1-.
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URL: https://dxwl.bnu.edu.cn/EN/10.16854/j.cnki.1000-0712.220596
https://dxwl.bnu.edu.cn/EN/Y2023/V42/I8/1
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