Abstract

Time flows. This oft-lamented fact of human existence seems plain enough, but is remarkably difficult to explain scientifically. Physical theory follows a greater goal—symmetry—and the directional nature of time is left adrift. The phenomenon must nevertheless be explained.Scientists since Isaac Newton have searched classical mechanics for answers, but precious little progress has been made on his mystical ideas. The discoveries of thermodynamics, though clearly relevant, have posed more problems than they have solved.Now a new solution presents itself through quantum mechanics. The intimate relation between thermodynamics and time is not in doubt, but now quantum theory is explaining how the laws of entropy arise from a stranger reality. The theory of decoherence begins to explain time as a holistic quantum concept.