Jim Rantschler and Randy Morrison discuss physics from elementary particles to cosmological effects at the limits of our theoretical knowledge or have recently emerged.
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
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
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
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
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
Jim and Randy talk about alternatives to black holes without event horizons or singularities.Show Notes: http://frontiers.physicsfm.com/61
Different people morn differently
I always sensed a closeness between Jim and Randy. When Randy passed Jim it seemed to me was too bereft to eulogize Randy. I don’t mean to put words in Jim’s mouth or pretend to know something I don’t, but the love between friends can be more profound than is comprehensible. I felt that depth in Jim’s closing remarks after their last show. I felt a profound sadness. I also felt he was angry that he left Jim so swiftly. Jim loved him that much.
They did randy dirty!
How disrespectful. No mention of Randy’s passing or tribute to him. On to the next episode. How cold!
I am shocked, saddened and in disbelief. We lost Randy. I always loved listening to these two friends, Jim and Randy go over papers on subjects way over my head. But the tone and vibe and information always left me feeling a little better if not learn something. My condolences to Jim. You lost a friend and partner. I
post briefly read, with glazed over eyes, about the LHC at CERN spotting these all charm quarks. I would love to hear your take. (there’s a “beauty” quark?)