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- W4385774562 abstract "Inspired by the discussion in the community on possible hidden systematic errors in late universe cosmological probes and non-trivial physical models developed to reduce the Hubble tension, we investigate the Pantheon and Pantheon+ SNe samples for possible deviations from the original $Lambda$CDM analysis. To simultaneously account for possible systematics or deviations from $Lambda$CDM, we adopt Gaussian processes to model additional covariance while making no further assumptions on their origin. We explore both stationary and non-stationarity corrections to the covariance. While small changes in the inferred cosmological parameters $H_0$ and $Omega_{m}$ can occur, we find no statistically significant evidence for missing covariance. We find an upper limit for the Gaussian processes amplitude $sigma < 0.031$ mag with $95%$ confidence, which corresponds to $20%$ of the average statistical error in the Pantheon+ sample. The strongest effect we find on the inferred cosmological parameter posterior can reduce the statistical significance of the Hubble tension between Pantheon+ and Planck estimates from 5.3$sigma$ to 4.5$sigma$. Therefore, we conclude that the SN cosmological parameter inference is robust against the analysis modifications studied in this work." @default.
- W4385774562 created "2023-08-12" @default.
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- W4385774562 date "2023-08-09" @default.
- W4385774562 modified "2023-09-26" @default.
- W4385774562 title "No evidence for missing covariance in the Pantheon+ SuperNova sample distance moduli" @default.
- W4385774562 doi "https://doi.org/10.48550/arxiv.2308.05157" @default.
- W4385774562 hasPublicationYear "2023" @default.
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