$Λ$CDM Tensions: Localising Missing Physics through Consistency Checks
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arXiv
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| Format: | Preprint |
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2024
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| author | Akarsu, Özgür Colgáin, Eoin Ó Sen, Anjan A. Sheikh-Jabbari, M. M. |
| author_facet | Akarsu, Özgür Colgáin, Eoin Ó Sen, Anjan A. Sheikh-Jabbari, M. M. |
| contents | $Λ$CDM tensions are by definition model dependent; one sees anomalies through the prism of $Λ$CDM. Thus, progress towards tension resolution necessitates checking the consistency of the $Λ$CDM model to localise missing physics either in redshift or scale. Since the Universe is dynamical and redshift is a proxy for time, it is imperative to first perform consistency checks involving redshift, then consistency checks involving scale, as the next steps to settle the ``systematics versus new physics" debate and foster informed model building. We present a review of the hierarchy of assumptions underlying the $Λ$CDM cosmological model and comment on whether relaxing them can address the tensions. We focus on the lowest lying fruit of identifying missing physics through the identification of redshift dependent $Λ$CDM model fitting parameters. We highlight recent progress made on ${S_8:= σ_8 \sqrt{Ω_{\rm m}/0.3}}$ tension and elucidate how similar progress can be made on $H_0$ tension. Our discussions indicate that $H_0$ tension, equivalently a redshift dependent $H_0$, and a redshift dependent $S_8$ imply a problem with background $Λ$CDM cosmology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_04767 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $Λ$CDM Tensions: Localising Missing Physics through Consistency Checks Akarsu, Özgür Colgáin, Eoin Ó Sen, Anjan A. Sheikh-Jabbari, M. M. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory $Λ$CDM tensions are by definition model dependent; one sees anomalies through the prism of $Λ$CDM. Thus, progress towards tension resolution necessitates checking the consistency of the $Λ$CDM model to localise missing physics either in redshift or scale. Since the Universe is dynamical and redshift is a proxy for time, it is imperative to first perform consistency checks involving redshift, then consistency checks involving scale, as the next steps to settle the ``systematics versus new physics" debate and foster informed model building. We present a review of the hierarchy of assumptions underlying the $Λ$CDM cosmological model and comment on whether relaxing them can address the tensions. We focus on the lowest lying fruit of identifying missing physics through the identification of redshift dependent $Λ$CDM model fitting parameters. We highlight recent progress made on ${S_8:= σ_8 \sqrt{Ω_{\rm m}/0.3}}$ tension and elucidate how similar progress can be made on $H_0$ tension. Our discussions indicate that $H_0$ tension, equivalently a redshift dependent $H_0$, and a redshift dependent $S_8$ imply a problem with background $Λ$CDM cosmology. |
| title | $Λ$CDM Tensions: Localising Missing Physics through Consistency Checks |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2402.04767 |