The Arrow of Time
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AbstractThe thermodynamic arrow of time is likely not a fundamental property of microscopic equations,which are largely time-reversible. It emerges statistically because the universe began in anextraordinarily special initial state of very low entropy—specifically, low gravitational entropy. Thesecond law of thermodynamics then drives cosmic evolution toward increasingly probablemacrostates, producing the asymmetry between past and future that we define as the a
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2026-04-28
