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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.09204 |
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| _version_ | 1866929547270684672 |
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| author | Wang, Zhuangfei Saadeh, Daniela Koyama, Kazuya Pogosian, Levon Bose, Benjamin Yi, Lanyang Zhao, Gong-Bo |
| author_facet | Wang, Zhuangfei Saadeh, Daniela Koyama, Kazuya Pogosian, Levon Bose, Benjamin Yi, Lanyang Zhao, Gong-Bo |
| contents | Modified Growth with {\tt CAMB} ({\tt MGCAMB}) is a patch for the Einstein-Boltzmann solver {\tt CAMB} for cosmological tests of gravity. Until now, {\tt MGCAMB} was limited to scales well-described by linear perturbation theory. In this work, we extend the framework with a phenomenological model that can capture nonlinear corrections in a broad range of modified gravity theories. The extension employs the publicly available halo model reaction code {\tt ReACT}, developed for modeling the nonlinear corrections to cosmological observables in extensions of the $Λ$CDM model. The nonlinear extension makes it possible to use a wider range of data from large scale structure surveys, without applying a linear scale cut. We demonstrate that, with the 3$\times$2pt Dark Energy Survey data, we achieve a stronger constraint on the linear phenomenological functions $μ$ and $Σ$, after marginalzing over the additional nonlinear parameter $p_1$, compared to the case without the nonlinear extension and using a linear cut. The new version of {\tt MGCAMB} is now forked with {\tt CAMB} on GitHub allowing for compatibility with future upgrades. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_09204 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Extending MGCAMB tests of gravity to nonlinear scales Wang, Zhuangfei Saadeh, Daniela Koyama, Kazuya Pogosian, Levon Bose, Benjamin Yi, Lanyang Zhao, Gong-Bo Cosmology and Nongalactic Astrophysics Modified Growth with {\tt CAMB} ({\tt MGCAMB}) is a patch for the Einstein-Boltzmann solver {\tt CAMB} for cosmological tests of gravity. Until now, {\tt MGCAMB} was limited to scales well-described by linear perturbation theory. In this work, we extend the framework with a phenomenological model that can capture nonlinear corrections in a broad range of modified gravity theories. The extension employs the publicly available halo model reaction code {\tt ReACT}, developed for modeling the nonlinear corrections to cosmological observables in extensions of the $Λ$CDM model. The nonlinear extension makes it possible to use a wider range of data from large scale structure surveys, without applying a linear scale cut. We demonstrate that, with the 3$\times$2pt Dark Energy Survey data, we achieve a stronger constraint on the linear phenomenological functions $μ$ and $Σ$, after marginalzing over the additional nonlinear parameter $p_1$, compared to the case without the nonlinear extension and using a linear cut. The new version of {\tt MGCAMB} is now forked with {\tt CAMB} on GitHub allowing for compatibility with future upgrades. |
| title | Extending MGCAMB tests of gravity to nonlinear scales |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2406.09204 |