Supernovae Evidence for Foundational Change to Cosmological Models
A study analyzing type Ia supernovae indicates a preference for timescape cosmology over the traditional $\Lambda$CDM model, suggesting a reassessment of cosmological principles due to strong statistical support.
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A recent study presents a new statistical analysis of the Pantheon+ type Ia supernovae dataset, suggesting a significant shift in cosmological models. The authors, Antonia Seifert and colleagues, employed a model-independent approach using the Tripp equation for supernova standardization, which mitigates potential correlations in the data. They compared the standard cosmological model, $\Lambda$CDM, with a novel timescape cosmology that accounts for the backreaction of inhomogeneities. The timescape model, which replaces dark energy with kinetic gravitational energy, showed strong statistical support over $\Lambda$CDM, with a likelihood ratio indicating substantial evidence for its validity. Even when focusing on supernovae at redshifts greater than 0.075, the timescape model remained favored. These findings imply a need to reassess the foundational principles of both theoretical and observational cosmology, challenging the long-standing $\Lambda$CDM framework.
- A new analysis of type Ia supernovae suggests a shift in cosmological models.
- The study favors timescape cosmology over the traditional $\Lambda$CDM model.
- The timescape model replaces dark energy with kinetic gravitational energy.
- Strong statistical evidence supports the need to revisit cosmological foundations.
- The findings challenge established theories in cosmology.
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14 commentsThis is an honest question since I have seen this phenomenon occur a few times now with cosmology/astrophysics papers on HN: How did the original poster find this? And why has it gotten such interest/points? I sincerely hope it is simply a well-intentioned interest in our universe (which it greatly heartens me to see!) combined with naïveté (not meant pejoratively, just to refer to lacking context) wrt the technical nature of this work, but I am interested to hear your thoughts.
[0] https://en.wikipedia.org/wiki/Inhomogeneous_cosmology?useski...
[0] https://en.wikipedia.org/wiki/A_Fire_Upon_the_Deep#Setting
The oldest version of this I know of can be seen in a diagram of ways that large black holes could possibly form in this book
https://en.wikipedia.org/wiki/Gravitation_(book)
which shows as early in 1973 people knew they had no idea how supermassive black holes could possibly form. Lately these problems have intensified because Webb seems to see that all sorts of developments seemed to happen a lot more quickly than they should of which leaves one wondering if the first billion years were really the first ten billion years. Could Timescape explain that?
https://theconversation.com/cosmological-models-are-built-on...
Dr Ridden, an author of this paper, has a great explainer video: https://www.youtube.com/watch?v=YhlPDvAdSMw
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