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Time's Arrow Points to Many Worlds

Shan Gao

Published Aug 15, 2021• 0 citations
OpenAlex

Abstract

It is argued that when assuming the initial state of the universe is not a special low-entropy macro-state, but a general superposition of both low-entropy states and high-entropy states, the observed thermodynamic arrow of time will provide strong evidence for the existence of many worlds.

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The nature of time and the origin of its apparent directionality remain among the most profound openquestions in physics. The prevailing view, grounded in thermodynamics and general relativity, holdsthat time possesses an intrinsic arrow pointing from a low-entropy past toward a higher-entropy future.In this paper, we propose an alternative framework in which the arrow of time is not fundamentalbut emerges from the process of past creation. We argue that a universal present exists—a single,shared “now” in which all objects reside—and that what we call the past is not a fixed record butis continuously created from the present. In this view, we do not move through time toward thefuture; we remain in the present while generating the past. We propose that wavefunction collapsevia environmental decoherence is the physical mechanism by which the present generates the past,suggesting a natural reinterpretation of the boundary between quantum mechanics and generalrelativity: quantum mechanics describes the present realm of uncollapsed superpositions, while generalrelativity describes the classical past realm that emerges from it. A key consequence of this frameworkis that observers at different gravitational potentials, running on different proper clocks as describedby general relativity, will observe a measurable, accumulating drift in the apparent timing of the samepast event. We propose that precision timing observations of pulsars offer a viable experimental testof this prediction. If confirmed, this would represent a fundamental shift in our understanding of thenature of time. We present this as a testable phenomenological framework rather than a completefundamental theory.