Sibling Rivalry: Thermonuclear Diversity and the Hubble Tension
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arXiv
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866909396719632384 |
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| author | Miller, Richard S. |
| author_facet | Miller, Richard S. |
| contents | Homogeneity is the hallmark of standard candle-based cosmology investigations. Thermonuclear supernovae (Type-Ia, SNeIa) violate this essential requirement if they develop along multiple evolutionary pathways. In this work, the impact of thermonuclear diversity on cosmological parameter constraints is quantified using Pantheon+, one of the largest ensembles of SNeIa compiled to probe cosmology to date. Evidence of diversity is encoded in supernova light curves. Pantheon+ is shown to be diverse, with features indicative of multiple thermonuclear sub-classes. Diversity-driven systematic effects have been quantified on a supernova-by-supernova basis; event selections based on light curve-derived metrics were subsequently used to characterize diversity-dependent trends and mitigate their impact. A "diversity free" estimate of the Hubble-Lemaître parameter, $H_0$=$67.5\pm3.5$ km s$^{-1}$ Mpc$^{-1}$ (68\% C.L.), was obtained by reanalyzing Pantheon+. The Hubble Tension, an apparent disparity between early- and late-Universe determinations of $H_0$, is eased from $\sim$$5σ$ to $<$$1σ$ after accounting for the diverse thermonuclear scenarios that govern SNeIa. A strategy for precise determination of $H_0$, dominated by statistical rather than systematic uncertainties, is also presented. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_01831 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Sibling Rivalry: Thermonuclear Diversity and the Hubble Tension Miller, Richard S. Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Homogeneity is the hallmark of standard candle-based cosmology investigations. Thermonuclear supernovae (Type-Ia, SNeIa) violate this essential requirement if they develop along multiple evolutionary pathways. In this work, the impact of thermonuclear diversity on cosmological parameter constraints is quantified using Pantheon+, one of the largest ensembles of SNeIa compiled to probe cosmology to date. Evidence of diversity is encoded in supernova light curves. Pantheon+ is shown to be diverse, with features indicative of multiple thermonuclear sub-classes. Diversity-driven systematic effects have been quantified on a supernova-by-supernova basis; event selections based on light curve-derived metrics were subsequently used to characterize diversity-dependent trends and mitigate their impact. A "diversity free" estimate of the Hubble-Lemaître parameter, $H_0$=$67.5\pm3.5$ km s$^{-1}$ Mpc$^{-1}$ (68\% C.L.), was obtained by reanalyzing Pantheon+. The Hubble Tension, an apparent disparity between early- and late-Universe determinations of $H_0$, is eased from $\sim$$5σ$ to $<$$1σ$ after accounting for the diverse thermonuclear scenarios that govern SNeIa. A strategy for precise determination of $H_0$, dominated by statistical rather than systematic uncertainties, is also presented. |
| title | Sibling Rivalry: Thermonuclear Diversity and the Hubble Tension |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2304.01831 |