Jim goes on a diatribe about infinities and the multiverse.
19 Jun 2020
Entropy v. Entropy
In this episode, I discuss a paper talking about the relationship between physical entropy and information-theoretic entropy in the context of quantum communication.
14 May 2020
The Machine in the Ghost
This week, I talk about the fate of the universe in Bohmian Cosmology. Specifically, how Torres, Fabris, and Piattella use the de Broglie-Bohm interpretation of quantum mechanics to modify the Wheeler-De Witt equation in the an accelerating universe.
Show Notes: http://papers.physicsfm.com/3
30 Apr 2020
Itty Bitty Physics
I talk about a paper by John Archibald Wheeler, "Information, Physics, Quantum: The Search for Links."
Show Notes: http://papers.physicsfm.com/2
19 Apr 2020
The Quantum Bookie
I talk about Quantum Bayesianism, the extension of the Bayesian interpretation of probability to quantum mechanics, through the work of Christopher Fuchs.
Show Notes: http://papers.physicsfm.com/1
4 Mar 2017
PhysicsFM - Intermission - Quantum Metaphysics
Jim and Randy discuss the ways in which we interpret the wavefunction, quantum indeterminancy, and other strange things that happen in quantum mechanics -- going through nine classes of interpretation and what they mean about the underlying reasons for quantum mechanical behavior.
5 Aug 2015
PhysicsFM - Quantum Paradoxes 9 - Quantum Cats
Randy and Jim discuss the implications of Schroedinger's Cat. In light of the measurement problem, in light of the collapse of the wave function, how can you understand what is happening to a quantum mechanical system?
2 Jul 2015
PhysicsFM - Quantum Paradoxes 8 - Measurement and Compensation
Jim and Randy discuss how "compensation forces" allow measurements of non-canonical variables without the difficulties discovered in the previous episode. They also discuss why some very important concepts of classical physics -- velocity and the electric field -- are not canonical.
22 Apr 2015
PhysicsFM - Quantum Paradoxes 7 - Quantum Measurements - Jim Rantschler and Randy Morrison
Randy and Jim talk about measurements of quantum systems, specifically in terms of a paradox involving the measurement of the velocity. This includes a long discussion of the von Neumann model of quantum mechanics.
25 Mar 2015
PhysicsFM - Quantum Paradoxes 6 - Nonlocality and Causality - Randy Morrison and Jim Rantschler
Jim and Randy discuss Aharonov and Rohrlich's suggestion that quantum mechanics should be formulated in terms of axioms based upon its physical peculiarities -- Nonlocality and Causality.
20 Feb 2015
PhysicsFM - Quantum Paradoxes 5 - Modular Variables - Randy Morrison and Jim Rantschler
Randy and Jim discuss modular variables and how looking at an infinite number of slits in a diffraction grating can better elucidate the process of quantum interference than the two-slit experiment.
24 Jan 2015
PhysicsFM - Quantum Paradoxes 4 - Phases and Gauges - Randy Morrison and Jim Rantschler
Jim and Randy talk about two paradoxes that help describe the Aharonov-Bohm effect. This requires an excursion into the gauge invariance of the vector potential of electrodynamics -- and how that gauge has real effects in quantum theory, even though it did not in classical physics.
20 Dec 2014
PhysicsFM - Quantum Paradoxes 3 - Is Quantum Theory Complete? - Randy Morrison and Jim Rantschler
Randy and Jim discuss the completeness of quantum theory via the EPR Paradox, Bell's Theorem, and the Aspect Experiment and they discuss the Block Universe and David Bohm's interpretation of quantum mechanics.
21 Nov 2014
PhysicsFM - Quantum Paradoxes 2 - How to Weigh a Quantum - Randy Morrison and Jim Rantschler
Jim and Randy discuss the meaning of consistency, black body radiation, the Compton effect, uncertainty relationships, single-slit diffraction, and the clock in a box paradox.
21 Oct 2014
PhysicsFM - Quantum Paradoxes 1 - The Uses of Paradox - Randy Morrison and Jim Rantschler
Randy and Jim discuss paradoxes in general, some quantum effects, what paradoxes mean to physics, and the twin paradox.
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