做化工的外贸网站都有什么地方百度ai人工智能

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以前看《费曼物理学讲义》觉得最小作用原理部分讲得非常多、而且比较炫。现在知道原因了。

The principle of least action in quantum mechanics

Richard Phillips Feynman(Princeton U.
)

May, 1942
74 pages
Supervisor:

John Archibald Wheeler

Thesis: PhD

Princeton U.

(1942)
ISBN:

9789812567635

DOI:

10.1142/9789812567635_0001

View in:

CERN Document Server, ADS Abstract Service

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13 citations
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Abstract:
A generalization of quantum mechanics is given in which the central mathematical concept is the analogue of the action in classical mechanics. It is therefore applicable to mechanical systems whose equations of motion cannot be put into Hamiltonian form. It is only required that some form of least action principle be available. It is shown that if the action is the time integral of a function of velocity and position (that is, if a Lagrangian exists), the generalization reduces to the usual form of quantum mechanics. In the classical limit, the quantum equations go over into the corresponding classical ones, with the same action function. As a special problem, because of its application to electrodynamics, and because the results serve as a confirmation of the proposed generalization, the interaction of two systems through the agency of an intermediate harmonic oscillator is discussed in detail. It is shown that in quantum mechanics, just as in classical mechanics, under certain circumstances the oscillator can be completely eliminated, its place being taken by a direct, but, in general, not instantaneous, interaction between the two systems. The work is non-relativistic throughout.
Note:

Ph.D. Thesis (Advisor: John Archibald Wheeler)Thesis