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Quantum mechanics from an epistemic state space

Per Östborn (Lund University, Sweden) We derive the Hilbert space formalism of quantum mechanics from epistemic principles. A key assumption is that a physical theory that relies on entities or distinctions that are unknowable in principle gives rise to wrong predictions. An epistemic formalism is developed, where concepts like individual and collective knowledge are used, and knowledge may be actual… Read more →

Weekly Papers on Quantum Foundations (12)

Classical Branch Structure from Spatial Redundancy in a Many-Body Wave Function  PRL: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. on 2017-3-24 2:00pm GMT Author(s): C. Jess Riedel When the wave function of a large quantum system unitarily evolves away from a low-entropy initial state, there is strong circumstantial evidence it develops “branches”: a decomposition into orthogonal components that… Read more →

Weekly Papers on Quantum Foundations (11)

Quantum Probabilities as Behavioral Probabilities. (arXiv:1703.05691v1 [q-bio.NC])  quant-ph updates on on 2017-3-18 9:36am GMT Authors: V.I. Yukalov, D. Sornette We demonstrate that behavioral probabilities of human decision makers share many common features with quantum probabilities. This does not imply that humans are some quantum objects, but just shows that the mathematics of quantum theory is applicable to the description of human… Read more →

The De Broglie-Bohm Theory As A Rational Completion Of Quantum Mechanics

We try to give a physical meaning to the wave function or quantum state of a system, apart from being a very efficient tool for predicting results of measurements on that system. In other words, we ask: what does it mean for a system outside the laboratories to have a wave function? We first explain why two possible, and probably common, answers to… Read more →

Weekly Papers on Quantum Foundations (10)

The unexpected resurgence of Weyl geometry in late 20-th century physics. (arXiv:1703.03187v1 [math.HO])  gr-qc updates on on 2017-3-11 7:48am GMT Authors: Erhard Scholz Weyl’s original scale geometry of 1918 (“purely infinitesimal geometry”) was withdrawn by its author from physical theorizing in the early 1920s. It had a comeback in the last third of the 20th century in different contexts: scalar… Read more →

On testing the simulation hypothesis

Tom Campbell, Houman Owhadiy, Joe Sauvageauz, David Watkinson Can the hypothesis that reality is a simulation be tested? We investigate this question based on the assumption that if the system performing the simulation is fi nite (i.e. has limited resources), then to achieve low computational complexity, such a system would, as in a video game, render content (reality) only at the moment that information… Read more →

Weekly Papers on Quantum Foundations (9)

Reversible time travel with freedom of choice. (arXiv:1703.00779v1 [gr-qc])  quant-ph updates on on 2017-3-04 8:42am GMT Authors: Ämin Baumeler, Fabio Costa, Timothy C. Ralph, Stefan Wolf, Magdalena Zych General relativity predicts the existence of closed time-like curves, along which a material object could travel back in time and interact with its past self. The natural question is whether this possibility leads to inconsistencies: Could… Read more →