Assessing the growth of structure over cosmic time with CMB lensing
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866909386783326208 |
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| author | Madhavacheril, Mathew S. |
| author_facet | Madhavacheril, Mathew S. |
| contents | The standard $Λ$CDM cosmological model informed by cosmic microwave background (CMB) anisotropies makes a precise prediction for the growth of matter density fluctuations over cosmic time on linear scales. A variety of cosmological observables offer independent and complementary ways of testing this prediction, but results have been mixed, with many constraints on the amplitude of structure $S_8$ being 2-3$σ$ lower than the expectation from Planck primary CMB anisotropies. It is currently unclear whether these discrepancies are due to observational systematics, non-linearities and baryonic effects or new physics. We review how gravitational lensing of the CMB has and will continue to provide insights into this problem, including through tomographic cross-correlations with galaxy surveys over cosmic time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_08152 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Assessing the growth of structure over cosmic time with CMB lensing Madhavacheril, Mathew S. Cosmology and Nongalactic Astrophysics The standard $Λ$CDM cosmological model informed by cosmic microwave background (CMB) anisotropies makes a precise prediction for the growth of matter density fluctuations over cosmic time on linear scales. A variety of cosmological observables offer independent and complementary ways of testing this prediction, but results have been mixed, with many constraints on the amplitude of structure $S_8$ being 2-3$σ$ lower than the expectation from Planck primary CMB anisotropies. It is currently unclear whether these discrepancies are due to observational systematics, non-linearities and baryonic effects or new physics. We review how gravitational lensing of the CMB has and will continue to provide insights into this problem, including through tomographic cross-correlations with galaxy surveys over cosmic time. |
| title | Assessing the growth of structure over cosmic time with CMB lensing |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2411.08152 |