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quant-ph1996
Geometric Foundation of Spin and Isospin
Ludger Hannibal
Various theories of spinning particles are interpreted as realizing elements of an underlying geometric theory. Classical particles are described by trajectories on the Poincare gr…
quant-ph1995
On Hegerfeldt's paradox
Ludger Hannibal
The acausal behavior of relativistic states exhibited by Hegerfeldt is shown not to be present in physical systems described by first order in time evolution equations.