Ranked #1
Dark Energy
Dark Energy
Randy helps Jim get a handle on Dark Energy. Why do we need it? What could it be? What does it have to do with you? ... Read more
9 Feb 2018
•
45mins
Ranked #2
A Gravitational Arrow of Time
A Gravitational Arrow of Time
Jim and Randy discuss a cosmological theory that purports to find an explanation for the arrow of time in gravitational ... Read more
20 Aug 2017
•
41mins
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Ranked #3
Gravitoelectromagnetism
Gravitoelectromagnetism
Randy talks to Jim about gravitoelectromagnetism. Based on the similarity between Newtonian gravity and electrostatics,... Read more
6 Dec 2016
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41mins
Ranked #4
Spooky Action at a Distance
Spooky Action at a Distance
Jim and Randy discuss experiments that put a minimum superluminal speed of communication between parts of a wavefunction... Read more
16 Jul 2019
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47mins
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Ranked #5
Loop Quantum Gravity
Loop Quantum Gravity
Jim and Randy discuss loop quantum gravity, and integration of quantum mechanics and gravity that quantizes space-time i... Read more
16 Aug 2019
•
44mins
Ranked #6
The Physics of Time Travel
The Physics of Time Travel
Randy and Jim talk about traveling through through time, discussing relativity and, in particular, Kurt Goedel's solutio... Read more
24 Nov 2017
•
43mins
Ranked #7
The Dimensionality of Space-Time
The Dimensionality of Space-Time
Jim discusses why the world we observe is 4-dimensional with Randy. We discuss anthropic and fundamental reasons why we... Read more
25 Nov 2018
•
43mins
Ranked #8
Bimetric Gravity
Bimetric Gravity
Randy introduces Jim to Sabine Hossenfelder's bimetric theory of gravity. In this gravitational theory, there are two t... Read more
24 Nov 2019
•
46mins
Ranked #9
Post-Newtonian Gravitation
Post-Newtonian Gravitation
Jim discusses the Parameterized Post-Newtonian formalism with Randy. The PPN framework is a general, linearized metric ... Read more
8 Jun 2018
•
41mins
Ranked #10
Tunneling Time
Tunneling Time
Jim talks to Randy about the amount of time it takes for an electron to tunnel through a forbidden region of space. Asto... Read more
7 Jul 2018
•
47mins
Ranked #11
Retrocausality
Retrocausality
Jim and Randy look at how quantum mechanics is affected by time. Most importantly, what happens when temporal boundary ... Read more
25 Jul 2018
•
34mins
Ranked #12
The Gravitational Equivalence Principles
The Gravitational Equivalence Principles
Jim talks to Randy about the different ways in which the equivalence principle of general relativity can be formulated. ... Read more
15 Apr 2018
•
46mins
Ranked #13
The Origin of Inertia
The Origin of Inertia
Randy tells Jim about a scheme that uses Mach's Principle - the idea that there is a preferred background frame with res... Read more
11 Jan 2018
•
38mins
Ranked #14
X17
X17
Jim and Randy discuss a possible "fifth force," the hypothetical X17 particle that has been seen in several experiments.... Read more
3 May 2020
•
38mins
Ranked #15
The Consistent Histories Interpretation of Quantum Mechanics
The Consistent Histories Interpretation of Quantum Mechanics
Jim and Randy discuss the consistent histories interpretation of quantum mechanics. The brainchild of Robert Griffiths a... Read more
24 May 2018
•
45mins
Ranked #16
Photonic Molecules and Optical Circuits
Photonic Molecules and Optical Circuits
Randy tells Jim about photonic molecules, pairs of photons that create bound states like molecules do through a force me... Read more
16 Jul 2017
•
36mins
Ranked #17
General Relativity for the Experimentalist
General Relativity for the Experimentalist
Randy shares some of his favorite papers with Jim: papers on general relativity by engineer and science fiction author R... Read more
14 Feb 2017
•
49mins
Ranked #18
Time Crystals
Time Crystals
Jim talks to Randy about structures that are periodic in time like crystals are periodic in space. Show notes: http://f... Read more
22 Dec 2017
•
34mins
Ranked #19
Wigner's Friend
Wigner's Friend
Randy and Jim discuss experiments that purport to show that there is no such thing as objective reality.Show Notes: http... Read more
22 Sep 2019
•
44mins
Ranked #20
f(R) Theories of Gravity
f(R) Theories of Gravity
Jim and Randy discuss gravitational theories that modify general relativity by changing the action using a polynomial de... Read more
2 Jun 2017
•
37mins
