So in the relativistic case, the Feynman path-integral representation of the propagator includes paths which go backwards in time, which describe antiparticles. The paths which contribute to the relativistic propagator go forward and backwards in time, and the interpretation of this is that the amplitude for a free particle to travel between two points includes amplitudes for the particle to fluctuate into an antiparticle, travel back in time, then forward again.
PHYSICS TO-DO LIST:
• FIND THE HIGGS (knowing neutrino masses would be nice too!)
• FIND THE DARK-MATTER PARTICLE.
• QUANTIZE GRAVITY (graviton?).
• QUANTIZE DARK ENERGY (darkon?).
• QUANTIZE INFLATION (inflaton?).
• SOMEHOW TEST POST-1980 THEORIES (Strings, etc.)
http://tinyurl.com/4ctjmv
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