This work revisits the long‑standing asymmetry in the treatment of time between quantum theory and general relativity. In quantum theory, time functions as an externally supplied, fine‑grained parameter governing microscopic state updates, whereas in relativity it appears as a coarse‑grained geometric quantity encoded in proper time. This Letter argues that this asymmetry can be understood as a scale‑dependent feature rather than a fundamental inconsistency. By reorganizing the perspective within existing theoretical frameworks—without introducing new physical assumptions—the microscopic time of quantum theory and the macroscopic geometric time of relativity can be interpreted as descriptions operating at different temporal scales. This scale‑dependent viewpoint offers a minimal and conceptually coherent starting point for reconsidering the “problem of time’’ in quantum gravity and provides a basic clue toward bridging quantum theory and relativity. The discussion is intended as a compact conceptual note, and a more detailed mathematical formulation will be presented in a separate work.
This work revisits the long‑standing asymmetry in the treatment of time between quantum theory and general relativity. In quantum theory, time functions as an externally supplied, fine‑grained parameter governing microscopic state updates, whereas in relativity it appears as a coarse‑grained geometric quantity encoded in proper time. This Letter argues that this asymmetry can be understood as a scale‑dependent feature rather than a fundamental inconsistency. By reorganizing the perspective within existing theoretical frameworks—without introducing new physical assumptions—the microscopic time of quantum theory and the macroscopic geometric time of relativity can be interpreted as descriptions operating at different temporal scales. This scale‑dependent viewpoint offers a minimal and conceptually coherent starting point for reconsidering the “problem of time’’ in quantum gravity and provides a basic clue toward bridging quantum theory and relativity. The discussion is intended as a compact conceptual note, and a more detailed mathematical formulation will be presented in a separate work.
Abstract The conceptual unification of quantum mechanics and relativity remains one of the central challenges of modern theoretical physics. While quantum theory successfully describes microscopic phenomena through probabilistic wave dynamics and field quantization, relativity establishes the geometric structure of space-time and the causal organization of physical events. Despite extensive progress in quantum field theory and relativistic quantum frameworks, foundational tensions persist regarding locality, causality, and coherence. This study presents a conceptual and structural analysis of quantum field coherence within relativistic space-time. Rather than focusing on specific unification proposals, we examine the compatibility conditions between quantum coherence, relativistic causality, and space-time structure. Particular attention is given to field-based interpretations of quantum states, entanglement propagation limits, and covariance requirements. The analysis synthesizes perspectives from relativistic quantum field theory, conceptual foundations of quantum measurement, and geometric interpretations of space-time. We argue that coherence phenomena can be understood as structurally constrained by relativistic causal order, without requiring violation of space-time locality. The aim of this article is to clarify foundational relationships between quantum coherence and relativistic structure through a conceptual framework that integrates field-theoretic and geometric viewpoints.
Cover Note This document is offered in a constructive spirit as a conceptual bridge between established frameworks. It does not propose a replacement of General Relativity or Quantum Mechanics, nor does it introduce new formal equations. Instead, it suggests that several long-standing tensions arise from a shared observational assumption regarding time and space. By introducing a stratified propagation perspective and distinguishing propagation-time (Kairos time) from measured linear time, the paper aims to show how relativistic geometry and quantum behavior may be understood as complementary descriptions at different resolutions of the same underlying process. The intent is to reduce conceptual friction, not to challenge existing results, and to provide a neutral framework that may help orient future theoretical and experimental work.
This work introduces Universal Quantum Time (UQT), a theoretical framework in which Planck’s constant emerges as an effective, coarse-grained quantity rather than a fundamental constant. A sub-Planckian temporal field provides global ordering of microscopic dynamics, from which standard quantum mechanics arises through temporal coarse-graining. The framework offers a deterministic foundation for quantum phenomena, including vacuum fluctuations, entanglement, and randomness, and explores implications for gravity, spacetime structure, antimatter as a time-conjugate sector, and experimental signatures. The theory is presented as a candidate framework addressing long-standing inconsistencies between quantum field theory and general relativity.
The problem of time in quantum gravity is often presented as a consequence of applying quantum theory to general relativity. These notes adopt a broader perspective. We first examine how time enters classical mechanics, relativity, quantum theory, and quantum field theory, distinguishing three principal aspects: causal order, temporal duration, and the present. This analysis shows that the conceptual difficulties associated with time do not arise only when gravity is quantised. Tensions between causal structure, clocks, observables, and measurement are already present in the theories from which quantum gravity is constructed. We then survey responses to the problem of time across the principal approaches to quantum gravity. These include canonical and Wheeler-DeWitt quantisation, path-integral and histories formulations, perturbative and background-dependent approaches, causal sets, and twistor theory. The programmes are compared according to whether they retain an external time, render time problematic through quantisation, or incorporate causal or temporal structure into their foundations. Particular emphasis is placed on questions arising from quantum foundations and relativistic quantum information. We conclude by examining linearised gravity and weak-gravity quantum systems. This regime shows that the problem of time is not confined to Planck-scale physics, but arises already in attempts to provide a predictive and operationally meaningful quantum description of spacetime near flat geometry.
Cover Note This document is offered in a constructive spirit as a conceptual bridge between established frameworks. It does not propose a replacement of General Relativity or Quantum Mechanics, nor does it introduce new formal equations. Instead, it suggests that several long-standing tensions arise from a shared observational assumption regarding time and space. By introducing a stratified propagation perspective and distinguishing propagation-time (Kairos time) from measured linear time, the paper aims to show how relativistic geometry and quantum behavior may be understood as complementary descriptions at different resolutions of the same underlying process. The intent is to reduce conceptual friction, not to challenge existing results, and to provide a neutral framework that may help orient future theoretical and experimental work.
Abstract Quantum mechanics and relativity are two of the most successful theoretical frameworks in modern physics, yet their conceptual foundations remain difficult to reconcile at the deepest level. Quantum theory describes physical systems through states, observables, probabilities, measurement contexts, superposition, entanglement, and nonclassical correlations. Relativity describes physical processes through space-time structure, causal order, invariant physical law, observer-dependent decomposition of time and space, and constraints on signal propagation. This article examines the conceptual relationship between quantum measurement, relativistic causality, and space-time description. The purpose is not to present a mathematical unification but to analyze how the two frameworks organize physical explanation differently and where their interpretive tensions arise. Special attention is given to the measurement problem, the status of quantum states, the role of observers and reference frames, the meaning of locality, the distinction between correlation and causal influence, and the challenge of describing quantum processes without privileging a single global time. The article argues that many apparent conflicts between quantum theory and relativity result from importing classical intuitions into domains where they no longer apply. Quantum entanglement does not permit controllable faster-than-light communication, yet it challenges classical separability. Relativity forbids superluminal signaling, yet it does not require that all physically meaningful correlations be reducible to local classical properties. Measurement introduces another difficulty because standard quantum theory often describes state update in a way that appears instantaneous, while relativistic space-time does not provide a universal present. The discussion develops a conceptual framework in which quantum measurement is treated as a physical interaction, relativistic causality as a constraint on operational influence, and space-time description as an organizing structure for events rather than a simple background stage. This analysis is relevant for quantum field theory, quantum information, relativistic quantum foundations, and future approaches to quantum gravity.