Episode 61: Dark Stars

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1. 

   E66 · 26 Jun 2022 · 30 min

   Episode 66: The Limit of General Relativity with James Owen Weatherall

   Jim talks with James Owen Weatherall about his work on viewing general relativity as an effective field theory and where it should give way to another theory. General relativity does a very good job of describing the world we see in astronomical observations, but certain results, e.g. singularities, and certain limits, e.g. the Planck scale, hint that there should be another theory that supersedes it. Jim Weatherall argues that this is in a high curvature regime.Show Notes: http://frontiers.physicsfm.com/66

2. 

   E65 · 22 May 2022 · 1 hr 5 min

   Episode 65: Causality, Time and the Experiment Paradox with Michal Eckstein

   Jim talks with Michal Eckstein of the Copernicus Institute for Interdisciplinary Studies about how two different kinds of ordering, chronological and causal, give rise to a robust idea of time. Additionally, we discuss the Experiment Paradox, a generalization of other measurement-type paradoxes in physics.Show Notes: http://frontiers.physicsfm.com/65

3. 

   E64 · 24 Apr 2022 · 29 min

   Episode 64: Born's Rule with Blake Stacey

   Jim talks with Blake Stacey about recent attempts to replace Born's rule. Born's rule is the principle used in quantum mechanics that associates quantum states to the probability of measurement. There has been a recent interest in Quantum Foundations to try to find a less arbitrary rationale for this procedure. Show Notes: http://frontiers.physicsfm.com/64

4. 

   E63 · 20 Mar 2022 · 44 min

   Episode 63: Gleason's Theorem with Blake Stacey

   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

5. 

   E62 · 13 Feb 2022 · 39 min

   Episode 62: Deformed Special Relativity

   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

6. 

   E60 · 12 Sep 2021 · 43 min

   Episode 60: Warp Bubbles

   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

7. 

   E59 · 5 Jul 2021 · 49 min

   Episode 59: The Hubble Crisis

   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

8. 

   E58 · 6 Jun 2021 · 38 min

   Episode 58: Phantom Matter

   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

9. 

   E57 · 2 May 2021 · 26 min

   Episode 57: Quantum Effects in Gravitational Waves

   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

10. 

    E56 · 1 Apr 2021 · 45 min

    Episode 56: Anomalous Magnetic Moment of the Muon

    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