  In 1948, Schwinger developed a local Lorentz covariant formulation of
relativistic quantum electrodynamics in space-time which is fundamentally
inconsistent with any delocalized interpretation of quantum mechanics. An
interpretation compatible with Schwinger's theory is presented, which makes all
of the same empirical predictions as conventional delocalized quantum theory in
configuration space. This is an explicit, unambiguous, and Lorentz-covariant
'local hidden variable theory' in space-time, whose existence proves
definitively that such theories are possible. There is no inconsistency with
Bell's theorem because this a local many-worlds theory. Each physical system is
characterized by a wave-field, which is a set of indexed piece-wise
single-particle wavefunctions in space-time, each with with its own
coefficient, along with a memory which contains the separate local
Hilbert-space quantum state at each event in space-time. Each single-particle
wavefunction of a fundamental system describes the motion of a portion of a
conserved fluid in space-time, with the fluid decomposing into many classical
point particles, each following a world-line and recording a local memory.
Local interactions between two systems take the form of local boundary
conditions between the differently indexed pieces of those systems'
wave-fields, with new indexes encoding each orthogonal outcome of the
interaction. The general machinery is introduced, including the local
mechanisms for entanglement and interference. The experience of collapse, Born
rule probability, and environmental decoherence are discussed, and a number of
illustrative examples are given.
