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- Title
A Relationship between the Schrödinger and Klein–Gordon Theories and Continuity Conditions for Scattering Problems.
- Authors
Scholle, Markus; Mellmann, Marcel
- 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 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.
- Subjects
NOETHER'S theorem; HAMILTON'S principle function; PARTICLE beams; KLEIN-Gordon equation; CONTINUITY; QUANTUM scattering; GALILEAN relativity
- Publication
Symmetry (20738994), 2023, Vol 15, Issue 9, p1667
- ISSN
2073-8994
- Publication type
Article
- DOI
10.3390/sym15091667