Late Time Modification of Structure Growth and the S8 Tension
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arXiv
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| Format: | Preprint |
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2023
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| author | Lin, Meng-Xiang Jain, Bhuvnesh Raveri, Marco Baxter, Eric J. Chang, Chihway Gatti, Marco Lee, Sujeong Muir, Jessica |
| author_facet | Lin, Meng-Xiang Jain, Bhuvnesh Raveri, Marco Baxter, Eric J. Chang, Chihway Gatti, Marco Lee, Sujeong Muir, Jessica |
| contents | The $S_8$ tension between low-redshift galaxy surveys and the primary CMB signals a possible breakdown of the $Λ$CDM model. Recently differing results have been obtained using low-redshift galaxy surveys and the higher redshifts probed by CMB lensing, motivating a possible time-dependent modification to the growth of structure. We investigate a simple phenomenological model in which the growth of structure deviates from the $Λ$CDM prediction at late times, in particular as a simple function of the dark energy density. Fitting to galaxy lensing, CMB lensing, BAO, and Supernovae datasets, we find significant evidence - 2.5 - 3$σ$, depending on analysis choices - for a non-zero value of the parameter quantifying a deviation from $Λ$CDM. The preferred model, which has a slower growth of structure below $z\sim 1$, improves the joint fit to the data over $Λ$CDM. While the overall fit is improved, there is weak evidence for galaxy and CMB lensing favoring different changes in the growth of structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16183 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Late Time Modification of Structure Growth and the S8 Tension Lin, Meng-Xiang Jain, Bhuvnesh Raveri, Marco Baxter, Eric J. Chang, Chihway Gatti, Marco Lee, Sujeong Muir, Jessica Cosmology and Nongalactic Astrophysics The $S_8$ tension between low-redshift galaxy surveys and the primary CMB signals a possible breakdown of the $Λ$CDM model. Recently differing results have been obtained using low-redshift galaxy surveys and the higher redshifts probed by CMB lensing, motivating a possible time-dependent modification to the growth of structure. We investigate a simple phenomenological model in which the growth of structure deviates from the $Λ$CDM prediction at late times, in particular as a simple function of the dark energy density. Fitting to galaxy lensing, CMB lensing, BAO, and Supernovae datasets, we find significant evidence - 2.5 - 3$σ$, depending on analysis choices - for a non-zero value of the parameter quantifying a deviation from $Λ$CDM. The preferred model, which has a slower growth of structure below $z\sim 1$, improves the joint fit to the data over $Λ$CDM. While the overall fit is improved, there is weak evidence for galaxy and CMB lensing favoring different changes in the growth of structure. |
| title | Late Time Modification of Structure Growth and the S8 Tension |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2308.16183 |