Standard quantum mechanics—the theory that is made use of in practice and is, because of this, taught in university courses— is a theory that is weakly objective only. For this reason it is most conveniently and neatly expressed by means of a set of basic rules of calculation that enable physicists to make predictions concerning what will be observed. Classical and quantum physics both make considerable use of the expressions "physical system" and "state of a physical system." Quantum mechanics is essentially a probabilistic theory. Except in special cases it makes no predictions that bear on individual systems. Rather, it predicts statistical frequencies. In other words, it predicts, as a rule, the number n of times that a given event will be observed when a large number N of physical systems of the same type and satisfying specified conditions are subjected to a measurement process.
The geometric phase due to the evolution of the Hamiltonian is a central concept in quantum physics and may become advantageous for quantum technology. In noncyclic evolutions, a proposition relates the geometric phase to the area bounded by the phase-space trajectory and the shortest geodesic connecting its end points. The experimental demonstration of this geodesic rule proposition in different systems is of great interest, especially due to the potential use in quantum technology. Here, we report a previously unshown experimental confirmation of the geodesic rule for a noncyclic geometric phase by means of a spatial SU(2) matter-wave interferometer, demonstrating, with high precision, the predicted phase sign change and π jumps. We show the connection between our results and the Pancharatnam phase. Last, we point out that the geodesic rule may be applied to obtain the red shift in general relativity, enabling a new quantum tool to measure gravity.
An approach to the measurement induced geometric phase based on the de Broglie--Bohm hidden-variable model is developed. The analysis involves an evolving geometric phase connecting the initial and final states of an individual experimental run. As an illustration the geometric phase produced by a cyclic sequence of spin-
21 filtering experiments is considered. It is argued, in this case, that the evolving geometric phase can be made close to the Samuel-Bhandari phase.
Resolving the Quantum Measurement Problem via 5D Geometry This paper is the second installment in the "Time-Delay Field" (TDF) theory series. Following the foundational work in "Emergent Wave Mechanics" (DOI: 10.5281/zenodo.18685669), we apply the 5D null geodesic framework to solve the longstanding "Measurement Problem" in quantum mechanics. Abstract:The instantaneous collapse of the wave function upon observation remains an unresolved paradox involving ill-defined concepts like "observers." We resolve this paradox within the TDF framework. By modeling particles as 5D null geodesics, we demonstrate that any measurement process necessarily involves a momentum transfer
Δpμ in 4D. Due to the geometric constraint of the 5D null metric (
PAPA=0), this 4D momentum kick forces a compensatory shift in the delay dimension momentum, resulting in a stochastic phase shift ("phase kick"). We show analytically that this mechanism randomizes the geometric phase, washing out interference terms. Thus, wave function collapse is derived as a deterministic, local mechanical process of "phase-momentum coupling" in the 5D bulk, eliminating the need for subjective observers. Key Contributions: Mechanical Collapse: Proves that "measurement" is simply a momentum transfer that scrambles the extra-dimensional phase. Derivation of the Born Rule: Shows that probability (
∣ψ∣2) arises from the conservation of 5D trajectory flux. No "Spooky" Action: Replaces non-local jumps with local geometric interactions in the delay dimension. Experimental Consistency: Aligns with recent symmetry-dependent timing experiments (Guo et al., 2026). Keywords: Measurement Problem, Wave Function Collapse, Decoherence, Time-Delay Field, 5D Geometry, Born Rule, Quantum Foundations, Objective Collapse.
We present the Geometric Block Universe (GBU), a framework in which the universe is a single static geometric structure and the probabilistic content of quantum mechanics is derived from that geometry rather than postulated. The central technical task is to obtain the Born rule as a theorem of Riemannian spectral geometry. At the quantum level of description the block is modelled by a compact Riemannian manifold B. The Riemannian volume measure is the natural density on B, and it forces the L2 inner product; the physical states are selected by a Dirichlet variational principle, which we prove to be the unique admissible choice among natural functionals of the appropriate degree under two explicitly stated and minimal hypotheses, in every dimension n ≥ 2. Under these hypotheses the Born rule is not assumed: it follows as a geometric theorem, the squared L2 overlap of states forced by the naturality of the volume measure together with Gleason's theorem [5] applied after holographic truncation. Quantum states are identified with Laplace-Beltrami eigenfunctions, the spectral modes of the metric Laplacian on B. The framework is a no-collapse one, and its ontology is block-universe realist: what is ontic is the geometry, while the state ψ is an indexical description of the transition amplitudes available to an observer from its current block. Nothing collapses and nothing splits; there is a fixed structure and observers who traverse it, and what appears within a traversal as a measurement event is a feature of how a path sits in the block rather than a process the structure undergoes. This places GBU in the no-collapse family, while departing from it ontologically, replacing dynamically generated branches with pre-existing geodesic paths. The holographic bound truncates the spectrum to a finite physical subspace, suggesting a finite-mode regularisation of ultraviolet divergences, with recovery of low-energy quantum field theory deferred to Paper 3. Temporal asymmetry is derived as an observer-selection effect on record-accumulating geodesics rather than a fundamental feature of the geometry. The constants c, ℏ and G are identified as geometric conversion factors between levels of the block structure. We demonstrate the framework on an explicit two-sphere calculation, and outline a five-paper programme. Throughout, the paper is explicit about the boundary between what is proven (the conditional Born-rule theorem), what is a route with a verified proof-of-concept (the dynamics), and what remains conjectural (the origin of the two-level structure, and the constants).