Article,
Lorentz-invariant Markov processes in relativistic phase space
Arkiv för Matematik, 6 (3): 241-268 (1966)10.1007/BF02592032.
Abstract
his paper deals with certain “random motions” permitted by the special theory of relativity; that is, with probability measures on sets of trajectories on which speeds are less than or equal to the speed c of light (which we take equal to 1 throughout). We deal with classes of such measures indexed by possible initial states, related to each other by the Lorentz group (implying certain invariance conditions for individual measures).
