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Proper Time as an Emergent Ratio of Quantum Uncertainties: New Predictions for Quantum Time Dilation and Gravitational Effects

A.B.M Masum Billah Mim

Published Apr 16, 2026• 0 citations
Publisher

Abstract

We propose that time is not a fundamental background but emerges from the quantum uncertainties of position, momentum, and energy. This is captured by the postulate \(\Delta \tau = \frac{\Delta x \,\Delta p}{\gamma \,\Delta E}\),where \(\Delta \tau\) is the proper time interval, \(\Delta x,\Delta p,\Delta E\) are the standard quantum uncertainties, and \(\gamma = 1/\sqrt{1-v^2/c^2}\) is the Lorentz factor associated with the average velocity \(v\). Using the standard wave‑packet relation \(\Delta E = v \Delta p\), our equation reduces exactly to the special relativistic proper time \(\Delta \tau = \Delta x/(\gamma v)\), demonstrating consistency with all existing tests. However, for non‑classical quantum states where \(\Delta E \neq v \Delta p\) (e.g., a superposition of widely separated momenta), our equation predicts new measurable effects: (i) a significant modification of the decay length of unstable particles (muons), (ii) a dependence of clock rates on the spatial spread \(\Delta x\) even in flat spacetime, and (iii) a quantum correction to gravitational time dilation when the Lorentz factor is replaced by the general relativistic factor \(\Gamma\). These predictions are falsifiable and provide a concrete experimental window into the emergent nature of time.

DOI
10.5281/zenodo.19602789

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We propose that time is not a fundamental background but emerges from the quantum uncertainties of position, momentum, and energy. This is captured by the postulate (\Delta \tau = \frac{\Delta x ,\Delta p}{\gamma ,\Delta E}),where (\Delta \tau) is the proper time interval, (\Delta x,\Delta p,\Delta E) are the standard quantum uncertainties, and (\gamma = 1/\sqrt{1-v^2/c^2}) is the Lorentz factor associated with the average velocity (v). Using the standard wave‑packet relation (\Delta E = v \Delta p), our equation reduces exactly to the special relativistic proper time (\Delta \tau = \Delta x/(\gamma v)), demonstrating consistency with all existing tests. However, for non‑classical quantum states where (\Delta E \neq v \Delta p) (e.g., a superposition of widely separated momenta), our equation predicts new measurable effects: (i) a significant modification of the decay length of unstable particles (muons), (ii) a dependence of clock rates on the spatial spread (\Delta x) even in flat spacetime, and (iii) a quantum correction to gravitational time dilation when the Lorentz factor is replaced by the general relativistic factor (\Gamma). These predictions are falsifiable and provide a concrete experimental window into the emergent nature of time.
A proper time observable for a quantum clock is introduced and it is found that the proper time read by one clock conditioned on another clock reading a different proper time obeys classical time dilation in accordance with special relativistic kinematical time dilation. Here, we extend this proposal to a weak gravitational field in order to investigate whether the weak equivalence principle holds for quantum matter. We find that for general quantum states the quantum time dilation in a weak gravitational field obeys a similar gravitational time dilation found in classical relativity. However, unlike the special relativistic case, the time dilation involves the external time (a background coordinate time at the observer on the Earth) as well as the proper times of two clocks. We also investigate a quantum time dilation effect induced by a clock in a superposition of wave packets localized in momentum space or in position space and propose the setup to observe the gravitational effect in the quantum interference effect in the time dilation.
Abstract Time dilation is a difference in measured time between two clocks that either move with different velocities or experience different gravitational potentials. Both of these effects stem from the theory of relativity and are usually associated with classically defined trajectories, characterized by position, momentum, and acceleration. However, when spatial degrees of freedom are treated in a quantum way and a clock is allowed to be in a coherent superposition of either two momenta or two heights, additional quantum corrections to classical time dilation appear, called kinematic and gravitational quantum time dilations, respectively. We show that similarly to its classical counterpart, kinematic quantum time dilation is universal for any clock mechanism, while gravitational quantum time dilation is not. We also show that although both of these effects reduce to incoherent averaging of different classical time dilation contributions, there exists an additional quantum time dilation effect that has no classical analog and can be extracted from higher-order corrections to the system’s Hamiltonian.
Classical clocks measure proper time along their worldline, and Riemannian geometry provides tools for predicting the time shown by clocks in both flat and curved spacetimes. Common approaches to time in quantum systems, based for instance on wave functions or density matrices, tend to obscure this geometric property at the quantum level. Here, a new framework is demonstrated for perturbing the classical path-length functional to include quantum degrees of freedom within a modified Riemannian geometry. In this framework, a quantum clock travels on geodesics of a family of spacetimes deformed by parameters specifying the clock's quantum state. Detailed derivations provide potentially testable corrections to gravitational time-dilation in Schwarzschild spacetime that scale with the ratio of the clock's Compton wavelength to its wave packet's spatial extent.
In general relativity, the description of spacetime relies on idealised rods and clocks, which identify a reference frame. In any concrete scenario, reference frames are associated to physical systems, which are ultimately quantum in nature. A relativistic description of the laws of physics hence needs to take into account such quantum reference frames (QRFs), through which spacetime can be given an operational meaning. Here, we introduce the notion of a spacetime quantum reference frame, associated to a quantum particle in spacetime. Such formulation has the advantage of treating space and time on equal footing, and of allowing us to describe the dynamical evolution of a set of quantum systems from the perspective of another quantum system, where the parameter in which the rest of the physical systems evolves coincides with the proper time of the particle taken as the QRF. Crucially, the proper times in two different QRFs are not related by a standard transformation, but they might be in a quantum superposition one with respect to the other.Concretely, we consider a system of N relativistic quantum particles in a weak gravitational field, and introduce a timeless formulation in which the global state of the N particles appears "frozen", but the dynamical evolution is recovered in terms of relational quantities. The position and momentum Hilbert space of the particles is used to fix the QRF via a transformation to the local frame of the particle such that the metric is locally inertial at the origin of the QRF. The internal Hilbert space corresponds to the clock space, which keeps the proper time in the local frame of the particle. Thanks to this fully relational construction we show how the remaining particles evolve dynamically in the relational variables from the perspective of the QRF. The construction proposed here includes the Page-Wootters mechanism for non interacting clocks when the external degrees of freedom are neglected. Finally, we find that a quantum superposition of gravitational redshifts and a quantum superposition of special-relativistic time dilations can be observed in the QRF.
According to relativity, the reading of an ideal clock is interpreted as the elapsed proper time along its classical trajectory through spacetime. In contrast, quantum theory allows the association of many simultaneous trajectories with a single quantum clock, each weighted appropriately. Here, we investigate how the superposition principle affects the gravitational time dilation observed by a simple clock – a decaying two-level atom. Placing such an atom in a superposition of positions enables us to analyze a quantum contribution to a classical time dilation manifest in spontaneous emission. In particular, we show that the emission rate of an atom prepared in a coherent superposition of separated wave packets in a gravitational field is different from the emission rate of an atom in a classical mixture of these packets, which gives rise to a quantum gravitational time dilation effect. We demonstrate that this nonclassical effect also manifests in a fractional frequency shift of the internal energy of the atom that is within the resolution of current atomic clocks. In addition, we show the effect of spatial coherence on the atom's emission spectrum.
We present a unified and minimal theoretical framework addressing the quantum-classical transition, the measurement problem, and the emergence of the arrow of time, grounded in gravitational physics. Building on the insight that quantum superpositions of mass distributions necessarily imply superpositions of gravitational potentials, we show that such states are unavoidably associated with superpositions of proper times due to gravitational time dilation. By extending the system Hilbert space to include a temporal degree of freedom, we demonstrate that matter-time entanglement leads naturally to effective decoherence when the time degree of freedom is traced out. The resulting reduced dynamics takes the form of a Lindblad master equation derived from an underlying unitary evolution. This framework reproduces the correct microscopic and macroscopic limits, clarifies the relation to Diósi-Penrose-type models, and provides a coherent account of classicality and temporal irreversibility without postulating observers, environmental decoherence as fundamental, or objective wavefunction collapse.