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Keywords = Madelung picture of Schrödinger’s theory

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13 pages, 309 KiB  
Article
A Relationship between the Schrödinger and Klein–Gordon Theories and Continuity Conditions for Scattering Problems
by Markus Scholle and Marcel Mellmann
Symmetry 2023, 15(9), 1667; https://doi.org/10.3390/sym15091667 - 29 Aug 2023
Cited by 1 | Viewed by 1270
Abstract
A rigorous analysis is undertaken based on the analysis of both Galilean and Lorentz (Poincaré) invariance in field theories in general in order to (i) identify a unique analytical scheme for canonical pairs of Lagrangians, one of them having Galilean, the other one [...] Read more.
A rigorous analysis is undertaken based on the analysis of both Galilean and Lorentz (Poincaré) invariance in field theories in general in order to (i) identify a unique analytical scheme for canonical pairs of Lagrangians, one of them having Galilean, the other one Poincaré invariance; and (ii) to obtain transition conditions for the state function purely from Hamilton’s principle and extended Noether’s theorem applied to the aforementioned symmetries. The general analysis is applied on Schrödinger and Klein–Gordon theory, identifying them as a canonical pair in the sense of (i) and exemplified for the scattering problem for both theories for a particle beam against a potential step in order to show that the transition conditions that result according to (ii) in a ‘natural’ way reproduce the well-known ‘methodical’ continuity conditions commonly found in the literature, at least in relevant cases, closing a relevant argumentation gap in quantum mechanical scattering problems. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Quantum Mechanics)
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