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What if Time Really Exists?

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abstract

Despite the obvious utility of the concept, it has often been argued that time does not exist. I take the opposite perspective: let's imagine that time does exist, and the universe is described by a quantum state obeying ordinary time-dependent quantum mechanics. Reconciling this simple picture with the known facts about our universe turns out to be a non-trivial task, but by taking it seriously we can infer deep facts about the fundamental nature of reality. The arrow of time finds a plausible explanation in a "Heraclitean universe," described by a quantum state eternally evolving in an infinite-dimensional Hilbert space.

fields

gr-qc 1

years

2026 1

verdicts

UNVERDICTED 1

representative citing papers

Toward a Phenomenologically Acceptable Quantum Cyclic Universe

gr-qc · 2026-05-28 · unverdicted · novelty 4.0

A finite-dimensional quantum model with commensurable energy eigenvalues and minimum-entropy initial condition yields exact periodicity and a distinguished entropy minimum that may represent the Big Bang while suppressing Boltzmann Brains.

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  • Toward a Phenomenologically Acceptable Quantum Cyclic Universe gr-qc · 2026-05-28 · unverdicted · none · ref 79 · internal anchor

    A finite-dimensional quantum model with commensurable energy eigenvalues and minimum-entropy initial condition yields exact periodicity and a distinguished entropy minimum that may represent the Big Bang while suppressing Boltzmann Brains.