Stage-IV Cosmic Shear with Modified Gravity and Model-independent Screening
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914758339330048 |
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| author | Tsedrik, Maria Bose, Benjamin Carrilho, Pedro Pourtsidou, Alkistis Pamuk, Sefa Casas, Santiago Lesgourgues, Julien |
| author_facet | Tsedrik, Maria Bose, Benjamin Carrilho, Pedro Pourtsidou, Alkistis Pamuk, Sefa Casas, Santiago Lesgourgues, Julien |
| contents | We forecast constraints on minimal model-independent parametrisations of several Modified Gravity theories using mock Stage-IV cosmic shear data. We include nonlinear effects and screening, which ensures recovery of General Relativity on small scales. We introduce a power spectrum emulator to accelerate our analysis and evaluate the robustness of the growth index parametrisation with respect to two cosmologies: $Λ$CDM and the normal branch of the DGP model. We forecast the uncertainties on the growth index $γ$ to be of the order $\sim 10\%$. We find that our halo-model based screening approach demonstrates excellent performance, meeting the precision requirements of Stage-IV surveys. However, neglecting the screening transition results in biased predictions for cosmological parameters. We find that the screening transition shows significant degeneracy with baryonic feedback, requiring a much better understanding of baryonic physics for its detection. Massive neutrinos effects are less prominent and challenging to detect solely with cosmic shear data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_11508 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stage-IV Cosmic Shear with Modified Gravity and Model-independent Screening Tsedrik, Maria Bose, Benjamin Carrilho, Pedro Pourtsidou, Alkistis Pamuk, Sefa Casas, Santiago Lesgourgues, Julien Cosmology and Nongalactic Astrophysics High Energy Physics - Theory We forecast constraints on minimal model-independent parametrisations of several Modified Gravity theories using mock Stage-IV cosmic shear data. We include nonlinear effects and screening, which ensures recovery of General Relativity on small scales. We introduce a power spectrum emulator to accelerate our analysis and evaluate the robustness of the growth index parametrisation with respect to two cosmologies: $Λ$CDM and the normal branch of the DGP model. We forecast the uncertainties on the growth index $γ$ to be of the order $\sim 10\%$. We find that our halo-model based screening approach demonstrates excellent performance, meeting the precision requirements of Stage-IV surveys. However, neglecting the screening transition results in biased predictions for cosmological parameters. We find that the screening transition shows significant degeneracy with baryonic feedback, requiring a much better understanding of baryonic physics for its detection. Massive neutrinos effects are less prominent and challenging to detect solely with cosmic shear data. |
| title | Stage-IV Cosmic Shear with Modified Gravity and Model-independent Screening |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2404.11508 |