NEOCLASSICAL PHYSICS AND QUANTUM GRAVITY
Imagine that nature is emergent from pairs of Planck scale fundamental particles, the electrino and the positrino, which are equal yet oppositely charged. These are the only carriers of energy, in electromagnetic and kinetic form. Now add in an infinite 3D Euclidean space (non curvy) and Maxwell’s equations. 𝗡𝗣𝗤𝗚 explores this recipe for nature and how it emerges as a narrative that is compatible with GR and QM, yet far superior in ability to explain the universe and resolve open problems. For 𝗡𝗣𝗤𝗚 basics see: Idealized Neoclassical Model and the NPQG Glossary.
Sabine Hossenfelder interviews Dr. Subir Sarkar of Oxford.
Summary of the Dr. Sarkar interview. His team has identified serious errors in the data science that found evidence for cosmic acceleration. Most of the interview is spent going through the various errors in data catalogues and statistical methods. Upon re-analysis, his team finds not evidence for acceleration, but a cosmic flow of spacetime in the same direction as the CMB dipole. Our galaxy is moving in the same direction as the dipole but 4x faster. (He gives credit to Singer who found this prior but was discounted). He then moves on to a discussion of the flaws in the concordance model (CMB+SNe+BAO). Bottom line he says “Evidence for isotropic acceleration is non-existent, and it is this that has had a major impact not just on cosmology but also fundamental physics.” So essentially he is calling the concept of dark energy into question. https://arxiv.org/abs/1808.04597. He then goes on to discuss how data science errors are problematic in the calculations of the Hubble values discrepancy. Some supernovas with different redshifts in different catalogues and other problems. https://arxiv.org/abs/1911.06456
Sarkar also talks a lot about interpretations, or what I call narrative, and how the field gets locked into certain interpretations. Those interpretations or stories then take on a life of their own and are hard to change when there is new evidence or in this case errors in the data science. It is fascinating how physics and cosmology build up cognitive models or understanding based on stories which are not science themselves, but which are derived from the science. Dark energy, dark matter, one time inflationary big bang, expansion, acceleration of expansion, these are all various stories abstracted from the observations. And some stories are based on other stories, like a story arc of a fiction. It gets very difficult to unweave the tangled tail.
J Mark Morris : San Diego : California : March 3, 2020 : v1