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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:
- Addison, G.E>, D.J. Watts, C.L. Bennett, M. Halpern, and G. Hinshaw, "Elucidating ΛCDM: Impact of Baryon Acoustic Oscillation Measurements on the Hubble Constant Discrepancy." ApJ 853, 119 (2018) [arXiv]
- Agrawal, P., F.-Y. Cyr-Racine, D. Pinner, L. Randall "Rock'n'Roll Solutions to the Hubble Tension." (2019) [arXiv]
- ..., "A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo ." ApJ 909, 208 (2021). [arXiv]
- Carnegie Supernova Project, " The Carnegie Supernova Project: Absolute Calibration and the Hubble Constant ." ApJ 869 56 (2018) [arXiv]
- Yang, T. S. Birrer, and B. Hu, "The first simultaneous measurement of Hubble constant and post-Newtonian parameter from time-delay strong lensing." Mon. Notices Royal Astron. Soc. 497, L56 (2020) [arXiv]
- Physics Frontiers 56: Multiversality
- Physics Frontiers 35: The String Theory Landscape
- Physics Frontiers 31: The Parameterized Post-Newtonian Framework
- Physics Frontiers 9: f(R) Theories of Gravity
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New paper explains that Cosmic background measurements are the most accurate and errors in measurement of Cepheid variables and red giants may be responsible for the apparent discrepancy. Here is the paper: https://arxiv.org/abs/2106.15656 (in prepublication) and here is a summary of it: https://cosmoquest.org/x/2021/07/new-research-may-bring-the-universe-into-cohesion/.
ReplyDeleteI read about that, although well after we recorded. I'm not sure what to think about it yet.
DeleteHi Jim and Randy. Long time listener of the podcast and I wanted to extend my gratitude for the episodes. Undertaking a theoretical PhD in a department focused on the experimental side, these podcasts allow me to connect with areas I wouldn't usually be exposed to.
ReplyDeleteI was wondering if you would consider doing an episode where we hear more about Jim and Randy's careers in physics: what motivates you to study, what research you have been a part of and how you have both stayed active during the pandemic.
Thanks again and best,
Jack.
Thanks, Jack! I don't think we'll be doing anything like that. There are occasional bits in the podcast where we talk about our pasts, but in general, we like to stick to papers, and we haven't been able to get our lives peer reviewed yet.
DeleteI would like to assure you, though, that neither of us has any first-hand knowledge of the research that we talk about, or any financial interest in any of the theories...even in the physics betting markets.