  I first review the physical basis for the universal maximal proper
acceleration. Next, I introduce a new formulation for a relativistic scalar
quantum field which generalizes the canonical theory to include the limiting
proper acceleration. This field is then used to construct a simple model of an
uncorrelated many-body system. I next argue that for a macroscopic object
consisting of more than Avogadro's number of atoms, any supposed quantum state
of the object is negligibly small, so that for all practical purposes, the
object is best described by classical mechanics. Thus, a new explanation is
offered for the quantum-to-classical transition and the absence of quantum
superposition of macroscopic objects in the everyday world.
