Implications of DES 5YR SNe Dataset for $Λ$CDM
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916632345968640 |
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| author | Colgáin, Eoin Ó Pourojaghi, Saeed Sheikh-Jabbari, M. M. |
| author_facet | Colgáin, Eoin Ó Pourojaghi, Saeed Sheikh-Jabbari, M. M. |
| contents | Dark Energy Survey five-year supernovae data (DES 5YR SNe) in conjunction with Planck CMB and Dark Energy Spectroscopic Instrument (DESI) BAO data has detected a strong dynamical dark energy (DE) deviation from the $Λ$CDM model.Here we shift the focus of DES data to the pressureless matter sector in the $Λ$CDM model by studying the matter density parameter $Ω_m$. Employing primarily frequentist profile likelihoods, supported by complementary Bayesian methods, we demonstrate that $Ω_m$ increases with effective redshift in the DES data up to a point that there is a $2.5 σ$ discrepancy with Planck. We relax the traditional $Ω_m \leq 1$ prior to demonstrate negative DE densities $Ω_m > 1$ at the highest effective redshift probed. Nevertheless, the largest discrepancy with Planck occurs for profile likelihoods and posteriors peaked at $Ω_m < 1$ in the traditional $Λ$CDM regime. Our findings corroborate earlier observations in Pantheon and Pantheon+ datasets with an independent SNe dataset with a higher effective redshift. In an appendix, we confirm that curvature $Ω_k$ decreases with effective redshift disfavouring a flat Universe in higher redshift DES SNe at $> 3 σ$. Our choice of $Ω_k$ prior leads to an underestimation of the tension with a flat Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_06389 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Implications of DES 5YR SNe Dataset for $Λ$CDM Colgáin, Eoin Ó Pourojaghi, Saeed Sheikh-Jabbari, M. M. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Dark Energy Survey five-year supernovae data (DES 5YR SNe) in conjunction with Planck CMB and Dark Energy Spectroscopic Instrument (DESI) BAO data has detected a strong dynamical dark energy (DE) deviation from the $Λ$CDM model.Here we shift the focus of DES data to the pressureless matter sector in the $Λ$CDM model by studying the matter density parameter $Ω_m$. Employing primarily frequentist profile likelihoods, supported by complementary Bayesian methods, we demonstrate that $Ω_m$ increases with effective redshift in the DES data up to a point that there is a $2.5 σ$ discrepancy with Planck. We relax the traditional $Ω_m \leq 1$ prior to demonstrate negative DE densities $Ω_m > 1$ at the highest effective redshift probed. Nevertheless, the largest discrepancy with Planck occurs for profile likelihoods and posteriors peaked at $Ω_m < 1$ in the traditional $Λ$CDM regime. Our findings corroborate earlier observations in Pantheon and Pantheon+ datasets with an independent SNe dataset with a higher effective redshift. In an appendix, we confirm that curvature $Ω_k$ decreases with effective redshift disfavouring a flat Universe in higher redshift DES SNe at $> 3 σ$. Our choice of $Ω_k$ prior leads to an underestimation of the tension with a flat Universe. |
| title | Implications of DES 5YR SNe Dataset for $Λ$CDM |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2406.06389 |