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PODCAST

Physics Frontiers

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

science physics

All Episodes

44:09

Episode 63: Gleason's Theorem with Blake Stacey

Physics Frontiers ·

2022/03/20

Jim talks with Blake Stacey about Gleason's Theorem, a foundational topic in the foundations of quantum mechanics. Gleason's theorem gives us a set of characteristic states for a measurement and the probability rule associated measuring them. This is the first part of the interview. The second part will discuss recent attempts to replace the Born Rule.Show Notes: http://frontiers.physicsfm.com/63

en-us

39:00

Episode 62: Deformed Special Relativity

Physics Frontiers ·

2022/02/13

Jim and Randy talk about how special relativity might be amended to incorporate a minimum length scale. Such scales are common in quantum gravity theories, and in the limit where both QM and GR are less important, QG should induce first order corrections to SR. We then talk about how these corrections seem to lead to unreasonable paradoxes.Show Notes: http://frontiers.physicsfm.com/62

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42:37

Episode 61: Dark Stars

Physics Frontiers ·

2021/10/31

Jim and Randy talk about alternatives to black holes without event horizons or singularities.Show Notes: http://frontiers.physicsfm.com/61

en-us

43:08

Episode 60: Warp Bubbles

Physics Frontiers ·

2021/09/12

Randy tells Jim about developments of metrics describing isolated spacetime bubbles that could, possibly, move faster than light.Show Notes: http://frontiers.physicsfm.com/60

en-us

48:47

Episode 59: The Hubble Crisis

Physics Frontiers ·

2021/07/05

Randy and Jim discuss the current tension between measurements of the Hubble constant by different methods, and some attempts to resolve the issue.Show Notes: http://frontiers.physicsfm.com/59

en-us

38:03

Episode 58: Phantom Matter

Physics Frontiers ·

2021/06/06

Jim and Randy talk about the Higgs portal to dark matter and the nightmare scenario for particle physicists: what if the LHC never saw any traces of supersymmetric particles?Show Notes: http://frontiers.physicsfm.com/58

en-us

26:21

Episode 57: Quantum Effects in Gravitational Waves

Physics Frontiers ·

2021/05/02

Randy and Jim talk about two proposals to use gravitational wave interferometry to show that gravitons exist through noise measurements.Show Notes: http://frontiers.physicsfm.com/57

en-us

44:36

Episode 56: Anomalous Magnetic Moment of the Muon

Physics Frontiers ·

2021/04/01

Jim and Randy discuss the measurements of the anomalous magnetic moment of the muon and some of the ways in which the discrepancy between theory and experiment could manifest themselves in new physics.Show Notes: http://frontiers.physicsfm.com/56

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37:36

Episode 55: Multiversality

Physics Frontiers ·

2020/12/07

Jim and Randy discuss the rationales for multiverses based on quantum mechanics, string theory, and the anthropic principle.Show Notes: http://frontiers.physicsfm.com/55

en-us

45:15

Episode 54: The ANITA Experiment

Physics Frontiers ·

2020/10/18

Randy and Jim talk about the strange results of the ANITA experiment: tau neutrinos that seem to come up out of the Earth.Notes: http://frontiers.physicsfm.com/54

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41:12

Electromagnetic Gravitational Repulsion

Physics Frontiers ·

2020/08/17

Randy tells Jim about ways in which electromagnetism reduces the gravitational attraction caused by a body.

en-us

37:41

Sterile Neutrinos

Physics Frontiers ·

2020/07/08

Jim and Randy discuss the hypothesis of sterile neutrinos, neutrinos that are even more ghostly than neutrinos that are dark matter candidates.

en-us

38:25

Gravitational Wave Astronomy

Physics Frontiers ·

2020/06/10

Jim and Randy talk about gravitational waves.

en-us

38:25

X17

Physics Frontiers ·

2020/05/03

Jim and Randy discuss a possible "fifth force," the hypothetical X17 particle that has been seen in several experiments. Erratum: The g-2 of the muon was shown to be off by 1 part in 500,000 in 2001 at Brookhaven. It may not be in there, I'm not sure how much of that I cut out.Show Notes: http://frontiers.physicsfm.com/50

en-us

39:35

The Unruh Effect

Physics Frontiers ·

2020/04/04

Jim and Randy discuss the apparent creation of quanta seen by comparing the viewpoints of relatively accelerating observers -- the Unruh Effect. (There is a little noise that shows up on Randy's track half way through - I did my best)Show Notes: http://frontiers.physicsfm.com/49(links to papers, podcasts, and more!)

en-us

40:14

The Gertsenshtein Effect

Physics Frontiers ·

2020/01/19

Randy introduces Jim to the Gertsenshtein effect, the conversion of gravitational waves to electromagnetic waves through resonances.Show Notes: http://frontiers.physicsfm.com/48

en-us

46:50

Bimetric Gravity

Physics Frontiers ·

2019/11/24

Randy introduces Jim to Sabine Hossenfelder's bimetric theory of gravity. In this gravitational theory, there are two types of matter whose only interaction is through gravitation. However, each one reacts to space-time differently, resulting in different metric tensors for each. In low-curvature situations, this creates a kind of anti-gravitation.Show Notes: http://frontiers.physicsfm.com/47

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44:43

Wigner's Friend

Physics Frontiers ·

2019/09/22

Randy and Jim discuss experiments that purport to show that there is no such thing as objective reality.Show Notes: http://frontiers.physicsfm.com/46

en-us

44:27

Loop Quantum Gravity

Physics Frontiers ·

2019/08/16

Jim and Randy discuss loop quantum gravity, and integration of quantum mechanics and gravity that quantizes space-time itself through the use of uncertain quanta of volumes and the random connections between them.

en-us

47:51

Spooky Action at a Distance

Physics Frontiers ·

2019/07/16

Jim and Randy discuss experiments that put a minimum superluminal speed of communication between parts of a wavefunction.Show Notes: http://frontiers.physicsfm.com/44

en-us

82 results

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