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:

• 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]

2. Related Episodes of Physics Frontiers:

• 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

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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