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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2412.15143 (astro-ph)
[Submitted on 19 Dec 2024]

Title:Supernovae evidence for foundational change to cosmological
models

Authors:Antonia Seifert, Zachary G. Lane, Marco Galoppo, Ryan
Ridden-Harper, David L. Wiltshire
View a PDF of the paper titled Supernovae evidence for foundational
change to cosmological models, by Antonia Seifert and 4 other authors
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    Abstract:We present a new, cosmologically model-independent,
    statistical analysis of the Pantheon+ type Ia supernovae
    spectroscopic dataset, improving a standard methodology adopted
    by Lane et al. We use the Tripp equation for supernova
    standardisation alone, thereby avoiding any potential correlation
    in the stretch and colour distributions. We compare the standard
    homogeneous cosmological model, i.e., $\Lambda$CDM, and the
    timescape cosmology which invokes backreaction of
    inhomogeneities. Timescape, while statistically homogeneous and
    isotropic, departs from average Friedmann-Lema\^
    itre-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 $\Lambda$CDM. 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.

Comments:          6 pages, 3 figures, 1 table; associated RAS press
                   release RAS PR 24/33
                   Cosmology and Nongalactic Astrophysics
Subjects:          (astro-ph.CO); General Relativity and Quantum
                   Cosmology (gr-qc); High Energy Physics -
                   Phenomenology (hep-ph)
Cite as:           arXiv:2412.15143 [astro-ph.CO]
                   (or arXiv:2412.15143v1 [astro-ph.CO] for this
                   version)
                   https://doi.org/10.48550/arXiv.2412.15143
                   Focus to learn more
                   arXiv-issued DOI via DataCite (pending
                   registration)
Journal reference: MNRAS Letters 537 (2025) L55
                   https://doi.org/10.1093/mnrasl/slae112
Related DOI:       Focus to learn more
                   DOI(s) linking to related resources

Submission history

From: Zachary Lane [view email]
[v1] Thu, 19 Dec 2024 18:26:04 UTC (876 KB)
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