Physics Frontiers

Jim Rantschler

Jim Rantschler and Randy Morrison discuss physics from elementary particles to cosmological effects at the limits of our theoretical knowledge or have recently emerged.

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82 episodes
Updated Oct 27, 2025

Episodes82

Newest first

Jun 6, 2019 · 34 min
The Positive Energy Theorem
Randy introduces Jim to a refutation of the positive energy theorem in a universe with a cosmolog...
May 4, 2019 · 36 min
Entropic Gravity
Jim and Randy discuss Eric Verlinde's theory thermodynamic theory of gravity. This theory purpor...
Feb 24, 2019 · 33 min
The Chameleon Field
Randy and Jim discuss the chameleon field -- a way to model dark energy with a scalar boson of va...
Dec 23, 2018 · 52 min
The Octonions
Randy tells Jim about a way to use an extension of an extension of the complex numbers to reveal ...
Dec 9, 2018 · 35 min
Negative Effective Mass
Randy tells Jim about experiments with Neutrons and Photons in materials that exhibit negative ef...
Nov 25, 2018 · 43 min
The Dimensionality of Space-Time
Jim discusses why the world we observe is 4-dimensional with Randy. We discuss anthropic and fun...
Oct 30, 2018 · 35 min
The Einstein-Cartan Torsion Field Theory
Randy explains to Jim theories on how to incorporate a native angular momentum into general relat...
Oct 15, 2018 · 42 min
The Metamaterial Stress Tensor
Randy tells Jim about recent results in the description of the electromagnetic stress tensor in m...
Sep 22, 2018 · 42 min
The String Theory Landscape
Jim and Randy explore the landscape of string theory in the anthropic manner put forward by Leona...
Aug 10, 2018 · 32 min
CPT Symmetry and Gravitation
CPT Symmetry is a fundamental symmetry in the standard model. Jim and Randy discuss what happens...
Jul 25, 2018 · 34 min
Retrocausality
Jim and Randy look at how quantum mechanics is affected by time. Most importantly, what happens ...
Jul 7, 2018 · 47 min
Tunneling Time
Jim talks to Randy about the amount of time it takes for an electron to tunnel through a forbidde...
Jun 8, 2018 · 41 min
Post-Newtonian Gravitation
Jim discusses the Parameterized Post-Newtonian formalism with Randy. The PPN framework is a gene...
May 24, 2018 · 46 min
The Consistent Histories Interpretation of Quantum Mechanics
Jim and Randy discuss the consistent histories interpretation of quantum mechanics. The brainchil...
May 16, 2018 · 46 min
Gravitational Alternatives to Dark Energy
Jim and Randy discuss how modifications to general relativity can be used to mimic the effects of...
Apr 25, 2018 · 41 min
The Quantum Vacuum and the Casimir Effect
Jim and Randy review two very convincing papers that make the claim that the Casimir effect is du...
Apr 15, 2018 · 46 min
The Gravitational Equivalence Principles
Jim talks to Randy about the different ways in which the equivalence principle of general relativ...
Mar 25, 2018 · 39 min
Antimatter Production at a Potential Boundary
Randy shows Jim an idea for generating antimatter using the Casimir effect that doesn't require a...
Mar 16, 2018 · 58 min
Gravitational Field Propulsion
Randy introduces Jim to several ways in which people have theorized that gravity can be used to p...
Feb 24, 2018 · 25 min
The Island of Stability
Randy tells Jim about the island of stability: a theoretically predicted oasis of stable nuclear ...