Open AccessThe Hellmann–Feynman theorem, the comparison theorem, and the envelope theory
Author(s) -
Claude Semay
Publication year - 2015
Publication title -
results in physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 56
ISSN - 2211-3797
DOI - 10.1016/j.rinp.2015.11.004
Subject(s) - no go theorem , envelope (radar) , quantum no deleting theorem , mathematics , feynman diagram , mathematical physics , quantum mechanics , fundamental theorem , physics , mathematical analysis , fixed point theorem , computer science , telecommunications , radar
The envelope theory is a convenient method to compute approximate solutions for bound state equations in quantum mechanics. It is shown that these approximate solutions obey a kind of Hellmann–Feynman theorem, and that the comparison theorem can be applied to these approximate solutions for two ordered Hamiltonians
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