We develop a gravitational collapse model in which spacetime geometry is postulated to beirreducibly classical and quantum superpositions of massive systems decay under a stochasticdynamics driven by a physical temporal medium. The model combines the Diósi–Penrosespatial kernel with a coloured temporal kernel of finite correlation time _c; the hypothesis _c τ τ= / E_g renders it parameter-free. The decoherence envelope is derived exactly: Gaussian at ℏ Δearly times, crossing to exponential Diósi–Penrose decay — a signature distinguishing themodel from thermal decoherence and from all Markovian collapse models. The coloured kernelsuppresses collapse-induced spontaneous radiation by ( _c) ², reconciling gravitational ωτ ⁻collapse with the underground null results that exclude the parameter-free Markovian model.We give quantitative predictions for levitated nanospheres and matter-wave interferometry, sixfalsification conditions, and outline interpretive consequences: a classicality wavefrontdefining the present moment, a selective arrow of time, and dark energy as the unimodularaccumulation of collapse-injected energy.
We develop a gravitational collapse model in which spacetime geometry is postulated to beirreducibly classical and quantum superpositions of massive systems decay under a stochasticdynamics driven by a physical temporal medium. The model combines the Diósi–Penrosespatial kernel with a coloured temporal kernel of finite correlation time _c; the hypothesis _c τ τ= / E_g renders it parameter-free. The decoherence envelope is derived exactly: Gaussian at ℏ Δearly times, crossing to exponential Diósi–Penrose decay — a signature distinguishing themodel from thermal decoherence and from all Markovian collapse models. The coloured kernelsuppresses collapse-induced spontaneous radiation by ( _c) ², reconciling gravitational ωτ ⁻collapse with the underground null results that exclude the parameter-free Markovian model.We give quantitative predictions for levitated nanospheres and matter-wave interferometry, sixfalsification conditions, and outline interpretive consequences: a classicality wavefrontdefining the present moment, a selective arrow of time, and dark energy as the unimodularaccumulation of collapse-injected energy.
Version 2.8 — submission manuscript. Preprint prepared for submission to Foundations of Physics. Supersedes v2.6, v2.5, v2.3, v2.2 and v1. A gravitational collapse model in which spacetime geometry is postulated to be irreducibly classical and superpositions of massive systems decay under a stochastic dynamics driven by a physical temporal medium: one stationary noise field combining the Diósi–Penrose spatial kernel with a coloured temporal kernel of finite universal bandwidth ω_u — the single new parameter of the primary model. The decoherence envelope is derived exactly (Gaussian onset, DP exponential tail), and two universality propositions are proved: the DP tail is fixed by the kernel's zero-frequency weight alone, and a Gaussian onset is generic for any finite-bandwidth medium — making the crossover, not any particular kernel, the experimental signature. A selectivity theorem shows each configuration draws its collapse dominantly from noise modes near its own gravitational frequency ΔE_g/ℏ. The parameter-free tuning of earlier versions is retained as named Conjecture C1, with a proof that no single stationary spectrum realises it for all configurations at once. The coloured kernel suppresses collapse-induced spontaneous radiation, reconciling the model with underground null results; heating bounds survive at full strength. Predictions include a closed-form optimal measurement window (separation 0.330 at t = 0.837 τ_dec under C1) and a mass-and-time ceiling on Bell violations, with five falsification conditions. The BMV/GIE treatment is current with the 2024–2026 literature. Changes in v2.8 (Appendix B, B11–B13): universal-bandwidth primary model with derived (ω_u, R_0) window; C1 demoted to conjecture with proved obstruction; no-signalling corrected and branch-conditioned; non-Markovian trajectory literature engaged, Born-rule theorem declared open; one prediction and the "present moment" identification withdrawn with reasons; GIE dispute disentangled; references verified. This paper builds on v1 of the companion collapse-model work (10.5281/zenodo.19960071). The lowest-energy principle assumed here was withdrawn in v2.2 of that paper and does not appear in the current version (v2.8); the framework presented here has not been revised accordingly. Retained as a record of the earlier line of enquiry All revisions, withdrawn claims, and corrected errors are documented in Appendix B; open problems in Section 8. AI tools (Claude, Anthropic) assisted with formalisation and editing; the conceptual framework originated with the author, who takes full responsibility. Full declaration in the manuscript.
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.
This work presents the first derivation of a measurement-collapse threshold within the Physical Time Medium (PTM) framework, expressed as a gravitational self-energy condition. By modeling the PTM density perturbation field ρₜ and the universal coupling coefficient κₚₜ, the collapse requirement Eₚₜ · τ ≥ ħ emerges naturally, without importing assumptions from Penrose–Diósi theory. A full mapping between PTM fields and the Newtonian potential Φ is shown, giving κₚₜ = (4πG)², which links quantum state instability directly to the PTM derivation of G. This closes the constant loop and ensures internal mathematical coherence across previous PTM publications. The resulting collapse timescale τₚₜ matches experimental bounds from molecular interferometry, optomechanical oscillators, and mesoscopic superposition experiments—demonstrating that PTM collapse behavior is quantitatively consistent with established empirical limits. This document establishes a unified gravitational interpretation of measurement collapse that is compatible with: • PTM gravity (G from time-medium consumption) • PTM life (emergence of stable self-maintaining structure) • PTM quantum collapse (transition from superposition to classical state) The formulation is mathematically self-consistent, testable, and fully aligned with the predictive structure developed in the broader PTM framework.
We derive an objective-collapse prediction for massive spatial superpositions from a singlepremise — that physical distinguishability is finite and discrete — and show that it evades thespontaneous-radiation bounds that exclude the parameter-free Di´osi–Penrose model. The mechanism is conservative: a superposition of a massive body in two locations is a superposition oftwo gravitational configurations, and when the gravitational self-energy difference ∆E betweenthem reaches the capacity of one distinguishability cell, coherence commits, on the timescaleτ ∼ℏ/∆E. This reproduces the Di´osi–Penrose collapse time, here derived rather than posited,with a regularisation length fixed without tuning as the nucleon Compton wavelength, giving acollapse mass ceiling of order 1012–1014 amu. The prediction is consistent with every matterwave interference experiment performed — at the current record (∼ 105 amu) the predictedcoherence time exceeds the experimental one by ten orders of magnitude — and lies withinreach of next-generation nanoparticle interferometry. Crucially, we derive the collapse masterequation and show that the momentum-diffusion coefficient, which controls spontaneous electromagnetic radiation and by which white-noise collapse models are experimentally excluded,vanishes exactly. The reason is structural: because the distinguishability ledger is discrete,the collapse rate as a function of branch separation is identically zero below a threshold — ahard step, not a smooth rise — so its curvature at zero separation, which sets the momentumdiffusion, is exactly zero. Localised charges therefore radiate nothing, and the undergroundradiation bounds do not apply. The result rests on one stated assumption, strict discreteness ofthe distinguishability count, which is the premise itself; granting it, the evasion of the radiationbounds is a theorem rather than a tuning.
Time Cosmology (TC) reads the dark sectors as tenses and identifies the present with an irreversible selection performed by the fundamental forces. At the background and recent-universe level TC is observationally degenerate with quintessence. This paper exhibits the program's first non-cosmological discriminant. Carried to the laboratory, the irreversible recording of an outcome into the gravitational ledger is governed by the Penrose energy-time criterion tau ~ hbar/E_G, a parameter-free collapse time for spatial superpositions; TC supplies the ontological reason Penrose left open (collapse = writing to the past) and attaches a Landauer cost. Because TC selection is a quantum non-demolition (QND) measurement by the existing forces, not a stochastic noise field, it carries no continuous momentum diffusion and hence no spontaneous radiation; it therefore survives the 2021 Gran Sasso experiment that excluded the parameter-free Diosi-Penrose model. The prediction is falsifiable: a spatial superposition of ~1e-17 to 1e-15 kg held beyond tau must collapse; the gap to capability is ~6 orders of magnitude for second-scale experiments, shrinking to ~1-2 orders for long-hold MAQRO-class proposals. Scope is stated explicitly: the collapse time reproduces Penrose's (the novelty is the grounding and the non-radiative survival); the non-radiativity rests on strict non-stochasticity, with a residual-diffusion bound left as the central open calculation; the test is not within current reach. All numerical claims are reproduced by the archived code included in this record. Companion records: Indispensable Present (10.5281/zenodo.20707004), N3 (10.5281/zenodo.20564003), N5 calorimeter (10.5281/zenodo.20617808).
The companion paper (Bryant 2026) proposed that time functions as a physical mediumthrough which the universe propagates its lowest-energy solutions, giving rise to gravity,quantum decoherence, the arrow of time, and dark energy as unified consequences of asingle variational principle. Here we extend this framework by proposing that thetemporal medium is three-dimensional — possessing three independent degrees offreedom (τ₁, τ₂, τ₃) rather than the single temporal axis of standard (3+1)-dimensionalspacetime. We propose natural physical assignments for each temporal dimension: τ₁as the propagation axis of the classicality wavefront (the experienced arrow of time), τ₂as the decoherence depth dimension (accumulating coherence penalty history), and τ₃as the entropic dimension (registering total entropy production). We show that this(3+3)-dimensional framework resolves several tensions left open in the companionpaper, including the origin of the temporal medium's energy density, the mechanism of quantum outcome selection, and the geometric account of nonlocal entanglementcorrelations. Causality is preserved by the lowest-energy principle itself — closedtemporal loops are exponentially suppressed by the same mechanism that enforces thearrow of time. We derive modified field equations, a generalised classicality wavefrontequation, and new experimental predictions distinguishing the three-dimensionaltemporal medium from the one-dimensional case.