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

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

Location:

United States

Description:

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

Twitter:

@physicsfm

Language:

English


Episodes

X17

5/3/2020
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

Duration:00:38:25

The Unruh Effect

4/4/2020
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!)

Duration:00:39:35

The Gertsenshtein Effect

1/19/2020
Randy introduces Jim to the Gertsenshtein effect, the conversion of gravitational waves to electromagnetic waves through resonances. Show Notes: http://frontiers.physicsfm.com/48

Duration:00:40:14

Bimetric Gravity

11/24/2019
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

Duration:00:46:50

Wigner's Friend

9/21/2019
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

Duration:00:44:43

Loop Quantum Gravity

8/16/2019
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.

Duration:00:44:27

Spooky Action at a Distance

7/15/2019
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

Duration:00:47:51

The Positive Energy Theorem

6/6/2019
Randy introduces Jim to a refutation of the positive energy theorem in a universe with a cosmological constant. Show Notes: http://frontiers.physicsfm.com/43

Duration:00:34:22

Entropic Gravity

5/3/2019
Jim and Randy discuss Eric Verlinde's theory thermodynamic theory of gravity. This theory purports to explain gravitational attraction and inertia through statistical mechanics. Show Notes: http://frontiers.physicsfm.com/42

Duration:00:36:21

The Chameleon Field

2/24/2019
Randy and Jim discuss the chameleon field -- a way to model dark energy with a scalar boson of varying strength. Show Notes: http://frontiers.physicsfm.com/41

Duration:00:33:21

The Octonions

12/23/2018
Randy tells Jim about a way to use an extension of an extension of the complex numbers to reveal the nature of elementary particles. Show Notes: http://frontiers.physicsfm.com/40

Duration:00:52:33

Negative Effective Mass

12/9/2018
Randy tells Jim about experiments with Neutrons and Photons in materials that exhibit negative effective mass. Not only do these effects show that the inertial mass of quasiparticles in a material can become negative, they show that these negative mass quasiparticles act like they have negative gravitational mass, as well. Show Notes: http://frontiers.physicsfm.com/39

Duration:00:35:44

The Dimensionality of Space-Time

11/25/2018
Jim discusses why the world we observe is 4-dimensional with Randy. We discuss anthropic and fundamental reasons why we need 3 dimensions and no more than one time dimension for reasons of complexity, predictability and stability. Show Notes: http://frontiers.physicsfm.com/38

Duration:00:43:38

The Einstein-Cartan Torsion Field Theory

10/29/2018
Randy explains to Jim theories on how to incorporate a native angular momentum into general relativity. Show Notes: http://frontiers.physicsfm.com/37

Duration:00:35:24

The Metamaterial Stress Tensor

10/14/2018
Randy tells Jim about recent results in the description of the electromagnetic stress tensor in metamaterials. In particular, we discuss the efforts to computationally model the stress tensor in amorphous metamaterials. Show Notes: http://frontiers.physicsfm.com/36

Duration:00:42:27

The String Theory Landscape

9/21/2018
Jim and Randy explore the landscape of string theory in the anthropic manner put forward by Leonard Susskind. Show Notes: http:frontiers.physicsfm.com/35

Duration:00:42:28

CPT Symmetry and Gravitation

8/10/2018
CPT Symmetry is a fundamental symmetry in the standard model. Jim and Randy discuss what happens when it is applied to general relativity. Show Notes: frontiers.physicsfm.com/34 [Really sorry for the muted tracks on the first upload. The problem has been fixed. - J]

Duration:00:32:12

Retrocausality

7/25/2018
Jim and Randy look at how quantum mechanics is affected by time. Most importantly, what happens when temporal boundary conditions are used to create standing waves in the wave function of a particle? Show Notes: http://frontiers.physicsfm.com/33

Duration:00:34:49

Tunneling Time

7/6/2018
Jim talks to Randy about the amount of time it takes for an electron to tunnel through a forbidden region of space. Astoundingly, how quickly this happens has been a subject of debate for eighty years and is still unresolved. Show Notes: http://frontiers.physicsfm.com/32

Duration:00:47:16

Post-Newtonian Gravitation

6/8/2018
Jim discusses the Parameterized Post-Newtonian formalism with Randy. The PPN framework is a general, linearized metric theory of gravity that can simulate all metric theories of gravity and compare them to solar system sized experiments. Show Notes: http://frontiers.physicsfm.com/31

Duration:00:41:47