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On the statistical ...
On the statistical assumption on the distance moduli of Supernovae Ia and its impact on the determination of cosmological parameters
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- Dainotti, M. G. (författare)
- Space Science Institute,Graduate University for Advanced Studies,National Astronomical Observatory of Japan
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- Bargiacchi, G. (författare)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli,Scuola Superiore Meridionale
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- Bogdan, M. (författare)
- Lund University,Lunds universitet,Statistiska institutionen,Ekonomihögskolan,Department of Statistics,Lund University School of Economics and Management, LUSEM,Wroclaw University
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- Capozziello, S. (författare)
- University of Naples Federico II,Scuola Superiore Meridionale,Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
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- Nagataki, S. (författare)
- Okinawa Institute of Science and Technology Graduate University,RIKEN SPring-8 center
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(creator_code:org_t)
- 2024
- 2024
- Engelska 12 s.
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Ingår i: Journal of High Energy Astrophysics. - 2214-4048. ; 41, s. 30-41
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Type Ia Supernovae (SNe Ia) are considered the most reliable standard candles and they have played an invaluable role in cosmology since the discovery of the Universe's accelerated expansion. During the last decades, the SNe Ia samples have been improved in number, redshift coverage, calibration methodology, and systematics treatment. These efforts led to the most recent “Pantheon” (2018) and “Pantheon +” (2022) releases, which enable to constrain cosmological parameters more precisely than previous samples. In this era of precision cosmology, the community strives to find new ways to reduce uncertainties on cosmological parameters. To this end, we start our investigation even from the likelihood assumption of Gaussianity, implicitly used in this domain. Indeed, the usual practice involves constraining parameters through a Gaussian distance moduli likelihood. This method relies on the implicit assumption that the difference between the distance moduli measured and the ones expected from the cosmological model is Gaussianly distributed. In this work, we test this hypothesis for both the Pantheon and Pantheon + releases. We find that in both cases this requirement is not fulfilled and the actual underlying distributions are a logistic and a Student's t distribution for the Pantheon and Pantheon + data, respectively. When we apply these new likelihoods fitting a flat ΛCDM model, we significantly reduce the uncertainties on the matter density ΩM and the Hubble constant H0 of ∼40%. As a result, the Hubble tension is increased at >5σ level. This boosts the SNe Ia power in constraining cosmological parameters, thus representing a huge step forward to shed light on the current debated tensions in cosmology.
Ämnesord
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
Nyckelord
- Cosmological parameters
- Cosmology
- Statistics
- Type Ia supernovae
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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