Monday, July 5, 2021

The Hubble Crisis

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Recorded: 2021/01/07 Released: 2021/07/05

Randy and Jim the differences between measurements in the Hubble constant and some proposals to resolve the issue.
------------------------------------------- Notes:

1. The papers we read for this program:
2. Related Episodes of Physics Frontiers:
3. Wendy Freedman recently published this article about the same topic, which some people say resolves the tension (It came out in the arXiv in June, we recorded in January, so it wasn't included). After going through it this weekend (7/17-18), I don't think it makes as strong a conclusion as the press made out, but it is worth reading, even at 48 pages. 4. Please visit and comment on our subreddit, YouTube Channel and if you can help us keep this going by contributing to our Patreon, we'd be grateful.
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Sunday, June 6, 2021

Phantom Matter

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Recorded: 2020/11/09 Released: 2021/06/06

Randy and Jim discuss a set of potential theories that could constitute dark matter that connect to normal matter through the Higgs particle.
------------------------------------------- Notes:

1. The papers we read for this program:
2. Related Episodes of Physics Frontiers:
3. Jim recently appeared on Anthony Jeannot's Highbrow Drivel podcast, displaying his innate ability to talk out of his ass for 60 minutes. Check it out. 3. Please visit and comment on our subreddit, YouTube Channel and if you can help us keep this going by contributing to our Patreon, we'd be grateful.
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Transcript (Rough Draft)
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Sunday, May 2, 2021

Quantum Effects in Gravitational Waves

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Recorded: 2020/10/01 Released: 2021/05/02

Jim and Randy discuss two proposals for experiments that would be sensitive to a quantum particle of gravity. Unlike electromagnetism where the quanitzation of matter requires a photon field, the quantization of matter does not require quantized gravitons.
------------------------------------------- Notes:

1. The papers we read for this program:
2. Other papers mention in this podcast:
  • Dyson, F. "Is a Graviton Detectable?." Int. J. Mod. Phys. A 28, 1330041 (2013). [pdf
  • Feynman, R., "The Quantum Theory of Gravitation." Acta Phys.Polon. 24 (1963) 697-722 24, 697 (1963).
3. Related Episodes of Physics Frontiers:
4. Randy mentioned our first podcast, Physics FM where we were discussing Aharonov and Rohrlich's Quantum Paradoxes.
5. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.
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Transcript (Rough Draft)
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Thursday, April 1, 2021

The Anomalous Magnetic Moment of the Muon

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Recorded: 2020/07/23 Released: 2021/04/01

Jim and Randy discuss measurements of the anomalous magnetic moment of the muon, as well as what the discrepency between theory and experiment might mean as far as new physics.
------------------------------------------- Notes:

1. The papers we read for this program:
2. Related Episodes of Physics Frontiers:
3. Fermilab's Muon g-2 Experiment.
4. The Mathematica Notebook mentioned in the first article. You can use this to explore different kinds of beyond the standartd model particles in the way the authors did.
5 Jim mentioned Melvin Schwartz's Principles of Electrodynamics [Amazon], an old textbook that goes into the details of the measurement of the anomalous magnetic moment. Because this is at least the second time I've used it extensively for the podcast, I have made a video, available here describing the book. Fortunately, my phone only had space for a 14 minute video, so I had to shut up about it.
6. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.
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Transcript (Rough Draft)
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Sunday, December 6, 2020

Multiversality

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Recorded: 2020/06/25 Released: 2020/12/06

Jim and Randy discuss rationales for the existence of a multiverse, guided by quantum mechanics, string theory, and the anthropic principle.
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Notes:

1. The papers we read for this program:



2. Related Episodes of Physics Frontiers:
3. Randy mentioned Sabine Hossenfelder's video on String Theory.
4. Jim mentioned Ian Hacking's The Emergence of Probabilty [Amazon]. This is a very intersting book that discusses the development of probability, with many interesting factoids along the way. In fact, it was in reading this book that I got the idea for the quantum dice.
5. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.

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Transcript (Rough Draft)
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Sunday, October 18, 2020

The ANITA Experiment

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Recorded: 2020/06/04 Released: 2020/10/18

Randy tells Jim about charged black holes, which exhibit an interesting reduction in their gravitational attraction. They discuss the Reissner-Nordstrom metric and an alternative theory.
-------------------------------------------

Notes:

1. The papers we read for this program:
  • Anchordoqui, L.A., V. Barger, J.G. LEaned, D. Marfatia, and T.J> Weiler "Upgoing ANITA Events as Evidence of the CPT Symmetric Universe" Letters in High Energy Physics 1, ? (2018). [arXiv
  • Gorham, P.W., et al., "Characteristics of Four Upward-Pointing Cosmic-Ray-Like Events Observed with ANITA." Phys. Rev.< Lett. 071101 , (2016). [arXiv]
  • ICECUBE COLLABORATION (over 250 "authors"), "A Search for ICECUDE Direction of ANITA Neutrino Candidates." ApJ 892, 53 (2020). [arXiv]
  • Safa, I., A. Pizzuto, F. Halzen, R. Hussain, A. Kheirandish, and J. Vandenboucke, "Observing EeV Neutrinos through Earth: GZK and teh Anomalous ANITA events." Journal of Cosmology and Astroparticle Physics 2020, ? (2020). [arXiv]
  • Romero-Wolf, A., et al., "A Comprehensive Analysis of Anomalous ANITA Evens Disfavors Diffuse Tau-Neutrino Flux Origin." Phys. Rev. D 99, 063011 (2019) [arXiv]



2. Related Episodes of Physics Frontiers:


3. ""The Saga of Atomspheric Neutrinos" by J.G. Learned at teh University of Hawaii. A perspective on the history of neutrino physics that Randy sent me and I mentioned in the podcast.

4. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.

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Transcript (Rough Draft)
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Sunday, August 16, 2020

Electromagnetic Gravitational Repulsion

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Recorded: 2020/05/21 Released: 2020/08/16

Randy tells Jim about charged black holes, which exhibit an interesting reduction in their gravitational attraction. They discuss the Reissner-Nordstrom metric and an alternative theory.
-------------------------------------------

Notes:

1. The papers we read for this program:
  • Lo, CK "Comments on 'Unification of Gravity and Electromagnetism by Mohammed A. El-Lakany' and Einstein's Unification" Journal of Physical Science and Application 7, 28 (2017).
  • Graves, J.C. and D.R. Brill, "Gravitational Bounce." Phys. Rev. 120, 1507 (1960).
  • Carter, B., "Complete Analytic Extension of the Symmetry Axis of Kerr's Solution of Einstein's Equations." Phys. Rev. 141, 1242 (1966). The next reference is so short, familiarity with this one is important.
  • Carter, B., "The Complete Analytic Extension of the Reissner-Nordstrom Metric in the Special Case e2 = m2." Phys. Lett. 21, 423 (1966).
  • de la Cruz, V. and W. Israel, "Gravitational Bounce." Il Nuovo Cimento 51, 6444 (1967).



2. Related Episodes of Physics Frontiers:


3. The Nature of Space and Time [Amazon], a debate between Stephen Hawking and Roger Penrose about relativity and cosmology. A very accessible, and recommended, discussion. As I mentioned to Randy, it's a good place to get acquainted with Penrose diagrams.

4. Gravitation [Amazon} by Misner, Thorne, and Wheeler. Contains all the information about gravity that you always wanted to know.

5. David Waite's general relativity on-line textbook and YouTube Channel.

6. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.

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Transcript (Rough Draft)
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