The discussion revolves around the Hubble tension, a discrepancy between measurements of the Hubble constant derived from different cosmological observations. Participants explore the historical context of the tension, its current status, and potential explanations, including the implications of early and late universe data.
Participants generally agree that the Hubble tension remains unresolved and that there are multiple competing views regarding its origins and implications. There is no consensus on whether the tension is due to measurement errors, the need for new physics, or other factors.
Participants express uncertainty regarding the historical context of the Hubble tension and the implications of recombination on density changes, indicating that some assumptions and definitions may be missing or unclear.
Readers interested in cosmology, the evolution of the universe, and the implications of observational discrepancies in astrophysics may find this discussion relevant.
Jaime Rudas said:Sorry but the calibration of JWST characteristics isn't the topic of the original post.
The paper by Freedman et al. is now on arXiv: https://arxiv.org/abs/2408.06153. From the abstract:Jaime Rudas said:Regarding the OP's question, it seems that in a recent conference, Wendy Freedman showed signs of a possible solution, as described by Dr. Becky here.
Of course, as Dr. Becky rightly points out, we need to wait for the publication of the paper to draw conclusions.
Yesterday, finally, Freedman's paper was published in The Astrophysical Journal, with this relevant conclusion:Jaime Rudas said:It should be noted that Freedman's results have not yet been published.
The distances measured using the TRGB and the JAGB methods agree, on average, at a level better than 1%, and with the SHoES Cepheid distances at just over the 1% level. Our results are consistent with the current standard Lambda cold dark matter (ΛCDM) model, without the need for the inclusion of additional new physics.
It strikes me that in this new version, the highlighted quote reads:renormalize said:The paper by Freedman et al. is now on arXiv: https://arxiv.org/abs/2408.06153. From the abstract:
"The distances measured using the TRGB and the JAGB method agree at the 1% level, but differ from the Cepheid distances at the 2.5-4% level. The value of Ho based on these two methods with JWST data alone is Ho = 69.03 +/- 1.75 (total error) km/sec/Mpc. These numbers are consistent with the current standard Lambda CDM model, without the need for the inclusion of additional new physics. Future JWST data will be required to increase the precision and accuracy of the local distance scale."
The distances measured using the TRGB and the JAGB methods agree, on average, at a level better than 1%, and with the SHoES Cepheid distances at just over the 1% level.