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Physics Frontiers

Physics Frontiers

Episode 70: Path Integrals and Entanglement with Ken Wharton

Sun, 18 Dec 2022

Jim talks with Ken Wharton about how to describe entangled states as sums over histories of particle paths using the path integral method.  He shows how this works for Bell-type experiments, entanglements swapping, delayed choice experiments, and the triangle network.  This leads to a second way to describe what happens quantum mechanically without introducing non-locality (but requiring other classical ideas to break down).

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Episode 69: The Flavor Puzzle with Joe Davighi

Sun, 20 Nov 2022

Jim talks with Joe Davighi of the University of Zurich about the flavor unification at high energies - the merging of all leptons into one kind of particle.  The discussion includes symmetries in particle physics, symmetry breaking at low temperatures, and unification schemes in general.  Joe also discusses both leptoquarks and proton stability in the context of his theory.

Episode 68: Quantum Resource Theories with Gilad Gour

Mon, 26 Sep 2022

Jim talks with Gilad Gour of the University of Toronto about quantum resource theories.  These are theories of largish systems that describe the relationships between possible states by the different levels of resources required for each.  By using resources, a system can move from one state to another.  This results in a partial order where between two states there could be two different states inaccessible to one another. Although (usually) these coalesce into an order based on a single property of thermodynamically-sized systems, the entropy, a few do not.

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Episode 67: Optical Gravity with Matthew R. Edwards

Sun, 14 Aug 2022

Jim talks with Matthew R. Edwards about his theory of Optical Gravity.  This is a Le Sage model of gravity based on graviton filiments.

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Episode 66: The Limit of General Relativity with James Owen Weatherall

Sun, 26 Jun 2022

Jim talks with James Owen Weatherall about his work on viewing general relativity as an effective field theory and where it should give way to another theory.  General relativity does a very good job of describing the world we see in astronomical observations, but certain results, e.g. singularities, and certain limits, e.g. the Planck scale, hint that there should be another theory that supersedes it.  Jim Weatherall argues that this is in a high curvature regime.

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