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

Mar 20, 2022 · 44 min
Episode 63: Gleason's Theorem with Blake Stacey
Jim talks with Blake Stacey about Gleason's Theorem, a foundational topic in the foundations of q...
Feb 13, 2022 · 39 min
Episode 62: Deformed Special Relativity
Jim and Randy talk about how special relativity might be amended to incorporate a minimum length ...
Oct 31, 2021 · 42 min
Episode 61: Dark Stars
Jim and Randy talk about alternatives to black holes without event horizons or singularities.Show...
Sep 12, 2021 · 43 min
Episode 60: Warp Bubbles
Randy tells Jim about developments of metrics describing isolated spacetime bubbles that could, p...
Jul 5, 2021 · 48 min
Episode 59: The Hubble Crisis
Randy and Jim discuss the current tension between measurements of the Hubble constant by differen...
Jun 6, 2021 · 38 min
Episode 58: Phantom Matter
Jim and Randy talk about the Higgs portal to dark matter and the nightmare scenario for particle ...
May 2, 2021 · 26 min
Episode 57: Quantum Effects in Gravitational Waves
Randy and Jim talk about two proposals to use gravitational wave interferometry to show that grav...
Apr 1, 2021 · 44 min
Episode 56: Anomalous Magnetic Moment of the Muon
Jim and Randy discuss the measurements of the anomalous magnetic moment of the muon and some of t...
Dec 7, 2020 · 37 min
Episode 55: Multiversality
Jim and Randy discuss the rationales for multiverses based on quantum mechanics, string theory, a...
Oct 18, 2020 · 45 min
Episode 54: The ANITA Experiment
Randy and Jim talk about the strange results of the ANITA experiment: tau neutrinos that seem to ...
Aug 17, 2020 · 41 min
Electromagnetic Gravitational Repulsion
Randy tells Jim about ways in which electromagnetism reduces the gravitational attraction caused ...
Jul 8, 2020 · 37 min
Sterile Neutrinos
Jim and Randy discuss the hypothesis of sterile neutrinos, neutrinos that are even more ghostly t...
Jun 10, 2020 · 38 min
Gravitational Wave Astronomy
Jim and Randy talk about gravitational waves.
May 3, 2020 · 38 min
X17
Jim and Randy discuss a possible "fifth force," the hypothetical X17 particle that has been seen ...
Apr 4, 2020 · 39 min
The Unruh Effect
Jim and Randy discuss the apparent creation of quanta seen by comparing the viewpoints of relativ...
Jan 19, 2020 · 40 min
The Gertsenshtein Effect
Randy introduces Jim to the Gertsenshtein effect, the conversion of gravitational waves to electr...
Nov 24, 2019 · 46 min
Bimetric Gravity
Randy introduces Jim to Sabine Hossenfelder's bimetric theory of gravity. In this gravitational ...
Sep 22, 2019 · 44 min
Wigner's Friend
Randy and Jim discuss experiments that purport to show that there is no such thing as objective r...
Aug 16, 2019 · 44 min
Loop Quantum Gravity
Jim and Randy discuss loop quantum gravity, and integration of quantum mechanics and gravity that...
Jul 16, 2019 · 47 min
Spooky Action at a Distance
Jim and Randy discuss experiments that put a minimum superluminal speed of communication between ...