Time-of-arrival formalism for the relativistic particle
arXiv:quant-ph/9608013 · doi:10.1088/0305-4470/30/13/027
Abstract
A suitable operator for the time-of-arrival at a detector is defined for the free relativistic particle in 3+1 dimensions. For each detector position, there exists a subspace of detected states in the Hilbert space of solutions to the Klein Gordon equation. Orthogonality and completeness of the eigenfunctions of the time-of-arrival operator apply inside this subspace, opening up a standard probabilistic interpretation.
16 pages, no figures, uses LaTeX. The section "Interpretation" has been completely rewritten and some errors corrected