The prior dependence of the DESI results
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910640270999552 |
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| author | Patel, Vrund Chakraborty, Amlan Amendola, Luca |
| author_facet | Patel, Vrund Chakraborty, Amlan Amendola, Luca |
| contents | In this short contribution, we explore the prior dependence of the recent DESI results, according to which a Bayesian comparison of $Λ$CDM with $w_0w_a$CDM cosmologies favors dynamical dark energy. It is a simple exercise to show that extending the prior lower bound of the dark energy parameters tilts the preference in favor of $Λ$CDM. Adopting the PantheonPlus supernovae catalog, for instance, a shift of the lower bound for $w_0,w_a$ from $-3$ to beyond $-4.6$ and $-5$, respectively, is sufficient to favor $Λ$CDM. This calls for caution when interpreting DESI results in the Bayesian context. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06586 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The prior dependence of the DESI results Patel, Vrund Chakraborty, Amlan Amendola, Luca Cosmology and Nongalactic Astrophysics In this short contribution, we explore the prior dependence of the recent DESI results, according to which a Bayesian comparison of $Λ$CDM with $w_0w_a$CDM cosmologies favors dynamical dark energy. It is a simple exercise to show that extending the prior lower bound of the dark energy parameters tilts the preference in favor of $Λ$CDM. Adopting the PantheonPlus supernovae catalog, for instance, a shift of the lower bound for $w_0,w_a$ from $-3$ to beyond $-4.6$ and $-5$, respectively, is sufficient to favor $Λ$CDM. This calls for caution when interpreting DESI results in the Bayesian context. |
| title | The prior dependence of the DESI results |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.06586 |