This is a stub for show notes.
The link you're looking for will be redirected to the show notes for the episode you're interested in as soon as it is about 50% ready.
Until then, go HERE for an index of all Physics Frontiers shows.
Monday, January 22, 2018
Sunday, November 12, 2017
Video: Physics Frontiers Episode 2
Finally got a video together for Physics Frontiers 2 - The de Broglie - Bohm Interpretation of Quantum Mechanics.
It's available on YouTube: PhysicFrontiers0002.mp4
Tell me what you think. I'm trying to add some illustrations that I think might be helpful.
Tuesday, October 31, 2017
Happy Birthday, Physics Frontiers
PhysicsFM was 3 years old October 20th, and the first Physics Frontiers episode came out one year ago today!
We've had over 20,000 downloads in our first year, plus almost 3,000 embedded plays through Podomatic.
Thank you for listening to our podcast. Randy and I are just a little bit happier every time you play one of our podcasts, and twice as happy every time you share it with a friend!
Thanks again!
Jim
We've had over 20,000 downloads in our first year, plus almost 3,000 embedded plays through Podomatic.
Thank you for listening to our podcast. Randy and I are just a little bit happier every time you play one of our podcasts, and twice as happy every time you share it with a friend!
Thanks again!
Jim
Tuesday, October 17, 2017
Extra Dimensions in Space and Time by Itzhak Bars and John Terning
Extra Dimensions in Space and Time is a wonderful find. A few months ago, Randy and I talked about Itzhak Bars' 2T theory of space and time for a Physics Frontiers podcast (it's two podcasts up in the editing queue and will come out about a month from when I publish this), and it was one of the hardest this for us to get a handle on. Randy is really excited about Bars' theory (and not just because he went to USC), but reading the papers he selected left us a little confused about how it worked. When I saw that Springer had a book by Bars on the subject, I decided to take the $125.00 hit. Maybe a longer form text would help me figure out what was going on, and maybe choose a couple of different papers for another podcast that were a little more understandable.
And I was pleasantly surprised by this book.
Extra Dimensions in Space and Time is the first in the Multiversal Journeys series, edited by Farzad Nekoogar. This series of books is fulfilling the purpose of the Multiversal Journeys organization:
making theoretical physics easy for the public. In that, the two halves of this book are non-technical introductions to their topics. The first hundred pages, by Itzhak Bars, talks about a theory of particles and interactions that uses two different time-like dimensions. The next sixty pages, by John Terning, discusses what the proliferation of spatial dimensions in string theory means. And they don't hurt your brain.
In Itzhak Bars' "Two-Time Physics: The Unified View from Higher Dimensional Space and Time," Bars discusses the reasons for his 2T physics. This includes an insightful development of physics, including string theory itself, building up to the rationale for the second time dimension. And then he discusses the implications of the theory.
Interestingly, two-time physics was the result of Bars' postulation of a symmetry. His postulate is this: there is a phase-space symmetry between different space-time dimensions without affecting the physics. Any particular direction at any particular event can be swapped with any other. Furthermore, this works with the energy-momentum tensor. On top of that, an energy can be swapped with a time and a spatial dimension can be swapped with a momentum component. Although his figure does not include cross arrows, I'd expect this to be true with the other possible reconfigurations. He calls this the Sp(2,R) symmetry.
Again, physics does not change when you regard a spatial dimension as being time-like, as long as you switch a time dimension to be space-like.
If this symmetry is indeed a law of nature, like translational or rotational symmetries, then there must be two time dimensions (no more and no less) and four space dimensions (at least, maybe you can have more, I don't remember, but you can't have less) to prevent anomalies like ghost particles -- the real universe is the 4+2 universe. These two extra dimensions are macroscopic, not the microscopic curled-in dimensions of string theory. And this leads to all of the interesting physics. The big, interesting analogy is that the universe you and I reside in, the 3+1 universe, is a holographic shadow of the 4+2 universe. And it is the way in which 4+2 objects project into 3+1 space-time that determines how we view them.
The eight ways in which Bars had shown these objects to project into our space are as:
But since that's the 13th chapter, you're going to skip it anyway.
So, this is a great book, especially given my expectations from Bars' papers, and I recommend it to people who want a deeper understanding about the theories that require additional dimensionality for the world. It's a step up from a popular book, and I think it's exactly the sort of thing that someone who listens to our podcast to enjoy.
And I was pleasantly surprised by this book.
Extra Dimensions in Space and Time is the first in the Multiversal Journeys series, edited by Farzad Nekoogar. This series of books is fulfilling the purpose of the Multiversal Journeys organization:
making theoretical physics easy for the public. In that, the two halves of this book are non-technical introductions to their topics. The first hundred pages, by Itzhak Bars, talks about a theory of particles and interactions that uses two different time-like dimensions. The next sixty pages, by John Terning, discusses what the proliferation of spatial dimensions in string theory means. And they don't hurt your brain.
In Itzhak Bars' "Two-Time Physics: The Unified View from Higher Dimensional Space and Time," Bars discusses the reasons for his 2T physics. This includes an insightful development of physics, including string theory itself, building up to the rationale for the second time dimension. And then he discusses the implications of the theory.
Interestingly, two-time physics was the result of Bars' postulation of a symmetry. His postulate is this: there is a phase-space symmetry between different space-time dimensions without affecting the physics. Any particular direction at any particular event can be swapped with any other. Furthermore, this works with the energy-momentum tensor. On top of that, an energy can be swapped with a time and a spatial dimension can be swapped with a momentum component. Although his figure does not include cross arrows, I'd expect this to be true with the other possible reconfigurations. He calls this the Sp(2,R) symmetry.
Again, physics does not change when you regard a spatial dimension as being time-like, as long as you switch a time dimension to be space-like.
If this symmetry is indeed a law of nature, like translational or rotational symmetries, then there must be two time dimensions (no more and no less) and four space dimensions (at least, maybe you can have more, I don't remember, but you can't have less) to prevent anomalies like ghost particles -- the real universe is the 4+2 universe. These two extra dimensions are macroscopic, not the microscopic curled-in dimensions of string theory. And this leads to all of the interesting physics. The big, interesting analogy is that the universe you and I reside in, the 3+1 universe, is a holographic shadow of the 4+2 universe. And it is the way in which 4+2 objects project into 3+1 space-time that determines how we view them.
The eight ways in which Bars had shown these objects to project into our space are as:
- Dirac Particles
- Particles in a Robertson-Walker Universe
- Massive Particles
- Particles in Maximally Symmetric Spaces
- The Hydrogen Atom
- Particles in a Conformally Flat Space
- The Harmonic Osciallator
- Twistors
which isn't everything, but its a lot.
Bars claims for 2T-Physics are the following:
- Sp(2,R) gauge symmetry of phase space is a fundamental property of nature.
- 2T-field theory, free of ghosts, has be successfully constructed and applied.
- Grand unified theories and supersymmetric 2T-field theory have been constructed as 2T-field theories.
- 2T-physics provides new technical computation tools for 1T-physics.
- 2T supergravity, 2T strings, 2T branes, 2T M-Theory are only partially constructed in 2T-physics at this time.
- A deeper phase space formulation of field theory is likely to exist.
- The extra space and time dimensions in 2T-physics are neither small nor hidden.
John Terning's "Extra Dimensions of Space" is of a similar level, if not anywhere near as weird. This is because Terning focusses on the strings and branes in M-Thoery, and stays just as far away from the scary math, ending, more-or-less, at the Higgs. When the book was written, in 2009, the Higgs particle hadn't been discovered at the LHC, but it was expected. Although nowhere near as detailed and nowhere near as out there as Bars' discussion, Terning does a good job of explaining why you need something like a string theory, and why the string theories that are limits of M-Theory satisfy those issues.
He builds up from the standard modern physics story, through symmetry and gravity, and then discusses string theory. How do strings manifest as particles? How do they interact with each other and with branes? How do branes deform, and what are the implications of such a deformation? Those are the questions Terning answers, just a little bit more exactly than you're used to in an equation-free account.
There is also a final chapter for those of you who feel like equation-free is to physics as Diet Pepsi is a Coca-Cola, "The Equations behind the Words." The thing is, I expect that for most of you that are interested in the exactness that mathematics provides a concept, the equations provided are things you're already familiar with.
But since that's the 13th chapter, you're going to skip it anyway.
So, this is a great book, especially given my expectations from Bars' papers, and I recommend it to people who want a deeper understanding about the theories that require additional dimensionality for the world. It's a step up from a popular book, and I think it's exactly the sort of thing that someone who listens to our podcast to enjoy.
Saturday, October 7, 2017
Stochastic Electrodynamics
Is the entire cosmos awash in a sea of invisible energy? Nikola Tesla thought so. And today a few daring theoretical physicists are pioneering the effort to explain the most exotic characteristics of quantum theory by describing the nature of this universal field of energy and its physical consequences. If they’re right, their theory could revolutionize the energy and transportation sectors around the globe, and perhaps even throw open the door to new forms of spaceflight. On this episode of Physics Frontiers, we’ll investigate the theory of stochastic electrodynamics, one of the most intriguing concepts in modern physics and a rising contender to explain the quantum world.
-------------------------------------------
Notes:
1. The main paper we read for this program: Contribution from Stochastic Electrodynamics to the Understanding of Quantum Mechanics by de la Peña and Cetto [arXiv]
2. The secondary paper we mentioned in program, predicting spontaneous parametric up-conversion: Non-Locality: The Party May Be Over by Marshall [arXiv]
3. Our subreddit.
Sunday, September 24, 2017
Theory and Experiment in Gravitational Physics by Clifford M. Will
Theory and Experiment in Gravitational Physics* is an excellent, if old, tract on the confrontation of general relativity and experiment (I read the revised edition of 1993). The author, C. M. Will, however, gives regular updates in the literature (the last time was 2014, to my knowledge). The theme of the book, really, is that General Relativity works and that, for the most part, its alternatives don't. At least not very well.
This isn't to say that Will shortchanges alternative theories. In fact, I'd say the opposite. Will depicts a wide array of theories of gravity, mainly of the "metric theory" variety because only metric theories of gravity seems to be consistent with experiment -- and the Einstein Equivalence Principle (he hints that the earlier edition included more, and in a few places he includes more). A metric theory satisfies three postulates:
The tests are presented in various ways.
There is an early description of tests of the Einstein equivalence principle (which states that a small object will follow a geodesic trajectory), since that eliminates all non-metric theories. The most important such test is the Eoetvoes experiment, which is a Cavendish-like experiment with bodies of different compositions; if this acts just like the Cavendish experiment, then the weak equivalence principle is sound. And that is about a third of what you need to show that the Einstein equivalence principle is sound. The other two points are local Lorentz invariance, which is tested by the Hughes-Drever NMR experiment, and local position invariance, which is tested by gravitational red shift experiments. These tests restrict gravity to be a metric theory.
Since only metric theories are valid, Will then discusses a parameterized post-Newtonian framework for stellar system tests of gravitational theories. By performing perturbative expansions of the dynamical quantities in the various gravities, he creates a suite of parameters that describe how gravity changes near bodies that are just a little more massive than can be described by classical physics. Each metric theory has a range for each of these parameters in which it is viable. So when measurements are taken, these parameters can be calculated by the data and then used to put limits on, and in some cases disqualify, theories of gravity. Furthermore, many of these parameters indicate symmetry and conservation laws that are valid or invalid in the theory. So even if a theory is not ruled out by experiment, this formulation tells you if, say, the law of conservation of angular momentum holds in it.
Getting to this point is essentially the first half of the book, and the second half mainly describes how different theories fare when confronted with the physical world.
His first foray is into what he calls the classical tests of general relativity, which he modifies because the gravitational red shift experiment is really a test of the weak equivalence principle. So he swaps that out, and uses the deflection of light, the time-delay of light, and the perihelion shift of Mercury as his tests. He then worries about tests of the strong equivalence principle -- which is very like the Einstein equivalence principle, but self-gravitating bodies cannot react to their own effects on space. He finishes up with tests of gravity waves (which oscillate differently in different theories of gravity), binary pulsars (whose neutron stars should be dense enough to affect their own trajectories, if such a things is possible), and a variety of cosmological tests (this was before the anisotropy of the cosmic microwave background was discovered).
And after all this, general relativity survives and most of the other theories really don't. Theories with additional vector and tensor couplings are right out, and scalar-tensor theories looked very doubtful. This is astounding because general relativity, with no free parameters, is the most restrictive theory of the bunch, the one with the least wiggle room to respond to those occasional experiments that are likely to tell the poor theoretician that his baby isn't as beautiful as he thought. In a Popperian world, this makes Einstein's theory the strongest or the survivors, and makes the scalar-tensor theories look bad -- especially when some theorist says that it's all this doom and gloom experiment stuff is okay, because you can always play with the parameters of his theory so that it will work (as one did in one of the papers Randy and I are reading for next week's recording -- it will probably be out around March). These experiments are very effective to be able to eliminate so many different kinds of theories, and with the exception of general relativity, those that survive only survive by being slippery.
And that was what everything looked like in 1993. If you look at Will's 2014 update, general relativity looks even better. Again, this is a wonderful book. We were going to use this, after Quantum Paradoxes, for the second book on PhysicsFM when we were doing that, and for good reason. It is little on the technical side, but if you've gotten through an undergraduate course in gravitation you should be okay (although there are a few chapters in the middle you might feel a little bit over your head in), and I recommend it heartily.
I need to find a better way to sign off. I still sound like a recommendation letter.
I really hope this book gets that internship.
* Links are to Amazon pages. If you buy from them, they'll give Physics Frontiers a cut.
[Edit 5/2/2020 - Removed discussion of new edition, since it's been out for two years, and added new links to Amazon, because they kicked me out of the associates program for underperformance, again, probably in 2018.]
This isn't to say that Will shortchanges alternative theories. In fact, I'd say the opposite. Will depicts a wide array of theories of gravity, mainly of the "metric theory" variety because only metric theories of gravity seems to be consistent with experiment -- and the Einstein Equivalence Principle (he hints that the earlier edition included more, and in a few places he includes more). A metric theory satisfies three postulates:- The underlying space-time structure is defined by a metric tensor field.
- The world lines of small objects are geodesics in space.
- The local space-time geometry approximates a Minkowski space.
The tests are presented in various ways.
There is an early description of tests of the Einstein equivalence principle (which states that a small object will follow a geodesic trajectory), since that eliminates all non-metric theories. The most important such test is the Eoetvoes experiment, which is a Cavendish-like experiment with bodies of different compositions; if this acts just like the Cavendish experiment, then the weak equivalence principle is sound. And that is about a third of what you need to show that the Einstein equivalence principle is sound. The other two points are local Lorentz invariance, which is tested by the Hughes-Drever NMR experiment, and local position invariance, which is tested by gravitational red shift experiments. These tests restrict gravity to be a metric theory.
Since only metric theories are valid, Will then discusses a parameterized post-Newtonian framework for stellar system tests of gravitational theories. By performing perturbative expansions of the dynamical quantities in the various gravities, he creates a suite of parameters that describe how gravity changes near bodies that are just a little more massive than can be described by classical physics. Each metric theory has a range for each of these parameters in which it is viable. So when measurements are taken, these parameters can be calculated by the data and then used to put limits on, and in some cases disqualify, theories of gravity. Furthermore, many of these parameters indicate symmetry and conservation laws that are valid or invalid in the theory. So even if a theory is not ruled out by experiment, this formulation tells you if, say, the law of conservation of angular momentum holds in it.
Getting to this point is essentially the first half of the book, and the second half mainly describes how different theories fare when confronted with the physical world.
His first foray is into what he calls the classical tests of general relativity, which he modifies because the gravitational red shift experiment is really a test of the weak equivalence principle. So he swaps that out, and uses the deflection of light, the time-delay of light, and the perihelion shift of Mercury as his tests. He then worries about tests of the strong equivalence principle -- which is very like the Einstein equivalence principle, but self-gravitating bodies cannot react to their own effects on space. He finishes up with tests of gravity waves (which oscillate differently in different theories of gravity), binary pulsars (whose neutron stars should be dense enough to affect their own trajectories, if such a things is possible), and a variety of cosmological tests (this was before the anisotropy of the cosmic microwave background was discovered).
And after all this, general relativity survives and most of the other theories really don't. Theories with additional vector and tensor couplings are right out, and scalar-tensor theories looked very doubtful. This is astounding because general relativity, with no free parameters, is the most restrictive theory of the bunch, the one with the least wiggle room to respond to those occasional experiments that are likely to tell the poor theoretician that his baby isn't as beautiful as he thought. In a Popperian world, this makes Einstein's theory the strongest or the survivors, and makes the scalar-tensor theories look bad -- especially when some theorist says that it's all this doom and gloom experiment stuff is okay, because you can always play with the parameters of his theory so that it will work (as one did in one of the papers Randy and I are reading for next week's recording -- it will probably be out around March). These experiments are very effective to be able to eliminate so many different kinds of theories, and with the exception of general relativity, those that survive only survive by being slippery.
And that was what everything looked like in 1993. If you look at Will's 2014 update, general relativity looks even better. Again, this is a wonderful book. We were going to use this, after Quantum Paradoxes, for the second book on PhysicsFM when we were doing that, and for good reason. It is little on the technical side, but if you've gotten through an undergraduate course in gravitation you should be okay (although there are a few chapters in the middle you might feel a little bit over your head in), and I recommend it heartily.
I need to find a better way to sign off. I still sound like a recommendation letter.
I really hope this book gets that internship.
* Links are to Amazon pages. If you buy from them, they'll give Physics Frontiers a cut.
[Edit 5/2/2020 - Removed discussion of new edition, since it's been out for two years, and added new links to Amazon, because they kicked me out of the associates program for underperformance, again, probably in 2018.]
Sunday, September 17, 2017
Physics Frontiers Index
Podcast Home
Posted Shows:
1. G4V: The Gravitational 4-Vector Formulation of Gravity
(Recorded: 10/8/2016) (Published: 10/31/2017) [video]
2. The de Broglie-Bohm Interpretation of Quantum Mechanics
(Recorded: 10/15/2016) (Published: 11/15/2017) [video]
3. Graviteoelectromagnetism
(Recorded: 10/22/2016) (Published: 12/6/2017) [video]
4. Phononics
(Recorded: 11/5/2016) (Published: 1/4/2017)
5. Pilot Wave Hydrodynamics
(Recorded: 11/20/2016) (Published: 1/20/2017)
6. General Relativity for the Experimentalist
(Recorded: 11/26/2016) (Published: 2/14/2017)
7. Virtual Gravitational Dipoles
(Recorded: 12/3/2016) (Published: 3/14/2017)
8. Vacuum Fluctuations and the Casimir Effect
(Recorded: 12/10/2016) (Published: 4/27/2017)
9. f(R) Theories of Gravity
(Recorded: 12/17/2016) (Published: 6/2/2017)
10. Requirements for Gravitational Theories
(Recorded: 1/15/2017) (Published: 6/30/2017)
11. Photonic Molecules and Optical Circuits
(Recorded: 1/21/2017) (Published: 7/16/2017)
12. A Gravitational Arrow of Time
(Recorded: 1/28/2017) (Published: 8/20/2017)
13. Exotic Photon Trajectories in Quantum Mechanics
(Recorded: 2/4/2017) (Published: 9/14/2017)
14. Stochastic Electrodynamics
(Recorded: 2/11/2017) (Published: 10/4/2017)
15. Five Proven Methods of Levitation
(Recorded: 3/5/2017) (Published: 10/21/2017)
16. Stochastic Resonance Energy Harvesting
(Recorded: 3/11/2017) (Published: 11/6/2017)
17. The Physics of Time Travel
(Recorded: 4/2/2017) (Published: 11/23/2017)
18. The 2T Physics of Itzhak Bars
(Recorded: 4/8/2017) (Published: 12/6/2017)
19. Exoplanets. [Lost track]
(Recorded: 4/15/2017)
20. Time Crystals
(Recorded: 4/22/2017) (Published: 12/21/2017)
21. The Origin of Inertia
(Recorded: 4/29/2017) (Published: 1/10/2018)
22. Weyl Quasiparticles
(Recorded: 5/7/2017) (Published: 1/18/2018)
23. Dark Energy
(Recorded: 5/20/2017) (Published: 2/8/2018)
24. The Island of Stability
(Recorded: 5/27/2017) (Published: 2/23/2018)
25. Gravitational Field Propulsion
(Recorded: 6/11/2017) (Published: 3/15/2018)
26. Antimatter Production at a Potential Boundary
(Recorded: 6/17/2017) (Published: 3/25/2018)
27. The Gravitational Equivalence Principles
(Recorded: 9/10/2017) (Published: 4/14/2018)
28. The Quantum Vacuum and the Casimir Effect
(Recorded: 9/16/2017) (Published: 4/24/2018)
29. Gravitational Alternatives to Dark Energy
(Recorded: 10/15/2017) (Published: 5/14/2018)
30. Consistent Histories Interpretation of Quantum Mechanics
(Recorded: 10/29/2017) (Pubished: 5/24/2018)
31. The Parameterized Post-Newtonian Framework
(Recorded: 11/12/2017) (Published: 6/8/2018)
32. Tunneling Time
(Recorded: 11/25/2017) (Published: 7/6/2018)
33. Retrocausality
(Recorded: 3/3/2018) (Published: 7/25/2018)
34. CPT Symmetry and Gravitation
(Recorded: 3/28/2018) (Published: 8/10/2018)
35. The String Theory Landscape
(Recorded: 5/12/2018) (Published: 9/21/2018)
36. The Electromagnetic Stress Tensor in Metamaterials
(Recorded: 5/26/2018) (Published: 10/14/2018)
37. The Einstein-Cartan Theory Torsion Field Theory
(Recorded: 6/10/2018) (Published: 10/29/2018)
38. Why is Space-Time Four Dimensional?
(Recorded: 9/8/2018) (Published: 11/25/2018)
39. Negative Effective Mass
(Recorded: 9/29/2018) (Published: 12/9/2018)
40. The Octonions
(Recorded: 10/20/2018) (Published: 12/23/2018)
41. The Chameleon Field
(Recorded: 11/3/2018) (Published: 2/24/2019)
42. Entropic Gravity
(Recorded: 4/4/2019) (Published: 5/3/2019)
43. The Positive Energy Theorem
(Recorded: 12/9/2017) (Published: 6/6/2019)
44. Spooky Action at a Distance
(Recorded: 5/2/2019) (Published: 7/15/2019)
45. Loop Quantum Gravity
(Recorded: 6/13/2019) (Published: 8/16/2019)
46. Wigner's Friend
(Recorded: 7/18/2019) (Published: 9/21/2019)
47. Bimetric Gravity
(Recorded: 8/15/2019) (Published: 11/23/2019)
48. Graviton-Photon Oscillations
(Recorded: 9/13/2019) (Published: 1/19/2020)
49. The Unruh Effect
(Recorded: 10/31/2019) (Published: 4/4/2020)
50. X17
(Recorded: 12/6/2019) (Published: 5/3/2020)
51. Gravitational Wave Astronomy
(Recorded: 3/19/2020) (Published: 6/9/2020)
52. Sterile Neutrinos
(Recorded: 4/24/2020) (Published: 7/7/2020)
53. Electromagnetic-Gravitational Repulsion
(Recorded: 5/21/2020) (Published: 8/16/2020)
54. The ANITA Experiment
(Recorded: 6/4/2020) (Publishted: 10/18/2020)
55. Multiversality
(Recorded: 6/25/2020) (Published: 12/6/2020)
56. The Anomalous Magnetic Moment of the Muon
(Recorded: 7/23/2020) (Published: 4/1/2021)
57. Qunatum Effects and Gravitational Waves
(Recorded: 10/1/2020) (Published: 5/2/2021)
58. The Higgs Portal
(Recorded: 11/9/2020) (Published: 6/7/2020)
59. The Hubble Crisis
(Recorded: 1/7/2021) (Published: 7/25/2021)
60. Physical Warp Drives
(Recorded: 3/25/2021) (Published: 9/12/2021)
61. Dark Stars
(Recorded: 6/10/2021) (Released: 10/31/2021)
62. Deformed Special Relativity
(Recorded: 2021/08/08) (Released: 2/13/2022)
63. Gleason's Theorem with Blake C. Stacey
(Recorded: 1/18/2022) (Published: 3/20/2022) [ Video ]
64. Born's Rule with Blake C. Stacey
(Recorded: 1/18/2022) (Released: 4/24/2022) [Video] [Extra]
65. Time and Causality with Michal Eckstein [Video]
(recorded: 3/21/2022) (Released: 5/20/2022)
66. The Limits of Gravitation with James Owen Weatherall
(Recorded: 5/19/2022) (Released:6/26/2022) [Video][Extra]
67. Optical Gravity with Matthew Edwards
(7/20/2022) (8/14/2022) [Extra]
68. Quantum Resource Theories with Gilad Gour
(08/04/2022) (09/25/2022)
69. The Flavor Puzzle with Joe Davighi
(08/23/2022) (11/20/2022)
70. Path Integrals and Entanglement with Kenneth Wharton
(11/8/2022) (12/18/2022)
71. Inflation and the Primordial Graviton Background with Sunny Vagnozzi
(12/1/2022) (2/19/2023)
72. Born's Rule and Quantum Gravity with Antony Valentini
(03/03/2023) (2023/04/23)
73. Quantum Money with Jiahui Liu
(03/28/2023) (06/18/2023)
74. Stochastic Thermodynamics with David Wolpert
(05/10/2023) (07/09/2023)
75. Which Theories Have a Measurement Problem? with Nick Ormrod and Vilasini Venkatesh
(07/17/2023) (08/20/2023)
76. Undecidability and Theories of Everything with Claus Kiefer
(08/07/2023) (01/28/2024)
77. Maxwellian Ratchets with Alex Jurgens
(12/18/2023) (2024/03/31)
78. Quantum Machine Learning with Bruna Shinohara
(02/16/2024) (05/31/2024)
Coming Soon (in editing):
Decoherent Histories and Many Worlds with Philipp Strasberg
Upcoming Shows (recorded and unedited):
Scheduled Recordings:
Delayed
Ideas:
XX. Superdeterminism
XX. Time Reversal Violations
XX. Quantum Mechanics and Closed Timelike Curves
Podcast Home
Posted Shows:
1. G4V: The Gravitational 4-Vector Formulation of Gravity
(Recorded: 10/8/2016) (Published: 10/31/2017) [video]
2. The de Broglie-Bohm Interpretation of Quantum Mechanics
(Recorded: 10/15/2016) (Published: 11/15/2017) [video]
3. Graviteoelectromagnetism
(Recorded: 10/22/2016) (Published: 12/6/2017) [video]
4. Phononics
(Recorded: 11/5/2016) (Published: 1/4/2017)
5. Pilot Wave Hydrodynamics
(Recorded: 11/20/2016) (Published: 1/20/2017)
6. General Relativity for the Experimentalist
(Recorded: 11/26/2016) (Published: 2/14/2017)
7. Virtual Gravitational Dipoles
(Recorded: 12/3/2016) (Published: 3/14/2017)
8. Vacuum Fluctuations and the Casimir Effect
(Recorded: 12/10/2016) (Published: 4/27/2017)
9. f(R) Theories of Gravity
(Recorded: 12/17/2016) (Published: 6/2/2017)
10. Requirements for Gravitational Theories
(Recorded: 1/15/2017) (Published: 6/30/2017)
11. Photonic Molecules and Optical Circuits
(Recorded: 1/21/2017) (Published: 7/16/2017)
12. A Gravitational Arrow of Time
(Recorded: 1/28/2017) (Published: 8/20/2017)
13. Exotic Photon Trajectories in Quantum Mechanics
(Recorded: 2/4/2017) (Published: 9/14/2017)
14. Stochastic Electrodynamics
(Recorded: 2/11/2017) (Published: 10/4/2017)
15. Five Proven Methods of Levitation
(Recorded: 3/5/2017) (Published: 10/21/2017)
16. Stochastic Resonance Energy Harvesting
(Recorded: 3/11/2017) (Published: 11/6/2017)
17. The Physics of Time Travel
(Recorded: 4/2/2017) (Published: 11/23/2017)
18. The 2T Physics of Itzhak Bars
(Recorded: 4/8/2017) (Published: 12/6/2017)
(Recorded: 4/15/2017)
20. Time Crystals
(Recorded: 4/22/2017) (Published: 12/21/2017)
21. The Origin of Inertia
(Recorded: 4/29/2017) (Published: 1/10/2018)
22. Weyl Quasiparticles
(Recorded: 5/7/2017) (Published: 1/18/2018)
23. Dark Energy
(Recorded: 5/20/2017) (Published: 2/8/2018)
24. The Island of Stability
(Recorded: 5/27/2017) (Published: 2/23/2018)
25. Gravitational Field Propulsion
(Recorded: 6/11/2017) (Published: 3/15/2018)
26. Antimatter Production at a Potential Boundary
(Recorded: 6/17/2017) (Published: 3/25/2018)
27. The Gravitational Equivalence Principles
(Recorded: 9/10/2017) (Published: 4/14/2018)
28. The Quantum Vacuum and the Casimir Effect
(Recorded: 9/16/2017) (Published: 4/24/2018)
29. Gravitational Alternatives to Dark Energy
(Recorded: 10/15/2017) (Published: 5/14/2018)
30. Consistent Histories Interpretation of Quantum Mechanics
(Recorded: 10/29/2017) (Pubished: 5/24/2018)
31. The Parameterized Post-Newtonian Framework
(Recorded: 11/12/2017) (Published: 6/8/2018)
32. Tunneling Time
(Recorded: 11/25/2017) (Published: 7/6/2018)
33. Retrocausality
(Recorded: 3/3/2018) (Published: 7/25/2018)
34. CPT Symmetry and Gravitation
(Recorded: 3/28/2018) (Published: 8/10/2018)
35. The String Theory Landscape
(Recorded: 5/12/2018) (Published: 9/21/2018)
36. The Electromagnetic Stress Tensor in Metamaterials
(Recorded: 5/26/2018) (Published: 10/14/2018)
37. The Einstein-Cartan Theory Torsion Field Theory
(Recorded: 6/10/2018) (Published: 10/29/2018)
38. Why is Space-Time Four Dimensional?
(Recorded: 9/8/2018) (Published: 11/25/2018)
39. Negative Effective Mass
(Recorded: 9/29/2018) (Published: 12/9/2018)
40. The Octonions
(Recorded: 10/20/2018) (Published: 12/23/2018)
41. The Chameleon Field
(Recorded: 11/3/2018) (Published: 2/24/2019)
42. Entropic Gravity
(Recorded: 4/4/2019) (Published: 5/3/2019)
43. The Positive Energy Theorem
(Recorded: 12/9/2017) (Published: 6/6/2019)
44. Spooky Action at a Distance
(Recorded: 5/2/2019) (Published: 7/15/2019)
45. Loop Quantum Gravity
(Recorded: 6/13/2019) (Published: 8/16/2019)
46. Wigner's Friend
(Recorded: 7/18/2019) (Published: 9/21/2019)
47. Bimetric Gravity
(Recorded: 8/15/2019) (Published: 11/23/2019)
48. Graviton-Photon Oscillations
(Recorded: 9/13/2019) (Published: 1/19/2020)
49. The Unruh Effect
(Recorded: 10/31/2019) (Published: 4/4/2020)
50. X17
(Recorded: 12/6/2019) (Published: 5/3/2020)
51. Gravitational Wave Astronomy
(Recorded: 3/19/2020) (Published: 6/9/2020)
52. Sterile Neutrinos
(Recorded: 4/24/2020) (Published: 7/7/2020)
53. Electromagnetic-Gravitational Repulsion
(Recorded: 5/21/2020) (Published: 8/16/2020)
54. The ANITA Experiment
(Recorded: 6/4/2020) (Publishted: 10/18/2020)
55. Multiversality
(Recorded: 6/25/2020) (Published: 12/6/2020)
56. The Anomalous Magnetic Moment of the Muon
(Recorded: 7/23/2020) (Published: 4/1/2021)
57. Qunatum Effects and Gravitational Waves
(Recorded: 10/1/2020) (Published: 5/2/2021)
58. The Higgs Portal
(Recorded: 11/9/2020) (Published: 6/7/2020)
59. The Hubble Crisis
(Recorded: 1/7/2021) (Published: 7/25/2021)
60. Physical Warp Drives
(Recorded: 3/25/2021) (Published: 9/12/2021)
61. Dark Stars
(Recorded: 6/10/2021) (Released: 10/31/2021)
62. Deformed Special Relativity
(Recorded: 2021/08/08) (Released: 2/13/2022)
63. Gleason's Theorem with Blake C. Stacey
(Recorded: 1/18/2022) (Published: 3/20/2022) [ Video ]
64. Born's Rule with Blake C. Stacey
(Recorded: 1/18/2022) (Released: 4/24/2022) [Video] [Extra]
65. Time and Causality with Michal Eckstein [Video]
(recorded: 3/21/2022) (Released: 5/20/2022)
66. The Limits of Gravitation with James Owen Weatherall
(Recorded: 5/19/2022) (Released:6/26/2022) [Video][Extra]
67. Optical Gravity with Matthew Edwards
(7/20/2022) (8/14/2022) [Extra]
68. Quantum Resource Theories with Gilad Gour
(08/04/2022) (09/25/2022)
69. The Flavor Puzzle with Joe Davighi
(08/23/2022) (11/20/2022)
70. Path Integrals and Entanglement with Kenneth Wharton
(11/8/2022) (12/18/2022)
71. Inflation and the Primordial Graviton Background with Sunny Vagnozzi
(12/1/2022) (2/19/2023)
72. Born's Rule and Quantum Gravity with Antony Valentini
(03/03/2023) (2023/04/23)
73. Quantum Money with Jiahui Liu
(03/28/2023) (06/18/2023)
74. Stochastic Thermodynamics with David Wolpert
(05/10/2023) (07/09/2023)
75. Which Theories Have a Measurement Problem? with Nick Ormrod and Vilasini Venkatesh
(07/17/2023) (08/20/2023)
76. Undecidability and Theories of Everything with Claus Kiefer
(08/07/2023) (01/28/2024)
77. Maxwellian Ratchets with Alex Jurgens
(12/18/2023) (2024/03/31)
78. Quantum Machine Learning with Bruna Shinohara
(02/16/2024) (05/31/2024)
Coming Soon (in editing):
Decoherent Histories and Many Worlds with Philipp Strasberg
Upcoming Shows (recorded and unedited):
Scheduled Recordings:
Delayed
Ideas:
XX. Superdeterminism
XX. Time Reversal Violations
XX. Quantum Mechanics and Closed Timelike Curves
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