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Supernovae evidence for foundational change to cosmological models

We present a new, cosmologically model-independent, statistical analysis of the Pantheon+ Type Ia Supernovae spectroscopic data set, improving a standard methodology adopted by Lane et al. We use the Tripp equation for supernova standardization alone, thereby avoiding any potential correlation in th...

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Bibliographic Details
Main Authors: Seifert, Antonia (Author) , Lane, Zachary G (Author) , Galoppo, Marco (Author) , Ridden-Harper, Ryan (Author) , Wiltshire, David L (Author)
Format: Article (Journal) Editorial
Language:English
Published: February 2025
In: Monthly notices of the Royal Astronomical Society. Letters
Year: 2025, Volume: 537, Issue: 1, Pages: L55-L60
ISSN:1745-3933
DOI:10.1093/mnrasl/slae112
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnrasl/slae112
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Author Notes:Antonia Seifert, Zachary G. Lane, Marco Galoppo, Ryan Ridden-Harper and David L. Wiltshire
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Summary:We present a new, cosmologically model-independent, statistical analysis of the Pantheon+ Type Ia Supernovae spectroscopic data set, improving a standard methodology adopted by Lane et al. We use the Tripp equation for supernova standardization alone, thereby avoiding any potential correlation in the stretch and colour distributions. We compare the standard homogeneous cosmological model, i.e. spatially flat Lambda cold dark matter (LambdaCDM), and the timescape cosmology which invokes backreaction of inhomogeneities. Timescape, while statistically homogeneous and isotropic, departs from average Friedmann-Lemaître-Robertson-Walker evolution, and replaces dark energy by kinetic gravitational energy and its gradients, in explaining independent cosmological observations. When considering the entire Pantheon+ sample, we find very strong evidence (ln B > 5) in favour of timescape over LambdaCDM. Furthermore, even restricting the sample to redshifts beyond any conventional scale of statistical homogeneity, z > 0.075, timescape is preferred over $\Lambda$CDM with ln B > 1. These results provide evidence for a need to revisit the foundations of theoretical and observational cosmology.
Item Description:Veröffentlicht: 19. Dezember 2024
Gesehen am 03.12.2025
Physical Description:Online Resource
ISSN:1745-3933
DOI:10.1093/mnrasl/slae112

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