3 papers
quant-ph2001
A Hamiltonian for the description of a non-relativistic spin-1/2 free particle
S. Bruce
We propose a Hamiltonian for a nonrelativistic spin 1/2 \QTR{it}{free} particle (e.g. an electron) and find that it contains information of its internal degrees of freedom in the r…
quant-ph1999
How to build a non-spreading wave packet in quantum mechanics
S. Bruce
Quantum mechanics asserts that a wave packet must inevitably spread as time progresses since the dispersion relation for the quantum waves is assumed to be quadratic in the momentu…
quant-ph1999
An approximation to the Lamb shift and hyperfine splitting as nonlinear effective Coulomb-like interactions in the Dirac equation
S. Bruce, J. Diaz-Valdes
The Dirac equation for the Coulomb problem is restated by incorporating a nonlinear effective interaction into the Dirac Hamiltonian: one keeps the dependence for the Coulomb…