The f(ℛ) halo mass function in the cosmic web
An important indicator of modified gravity is the effect of the local environment on halo properties. This paper examines the influence of the local tidal structure on the halo mass function, the halo orientation, spin and the concentration-mass relation. We use the excursion set formalism to produc...
| Main Authors: | , , , |
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| Format: | Journal article |
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Institute of Physics
2017
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| _version_ | 1797101588609761280 |
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| author | Braun-Bates, F Winther, H Alonso, D Devriendt, J |
| author_facet | Braun-Bates, F Winther, H Alonso, D Devriendt, J |
| author_sort | Braun-Bates, F |
| collection | OXFORD |
| description | An important indicator of modified gravity is the effect of the local environment on halo properties. This paper examines the influence of the local tidal structure on the halo mass function, the halo orientation, spin and the concentration-mass relation. We use the excursion set formalism to produce a halo mass function conditional on large-scale structure. Our simple model agrees well with simulations on large scales at which the density field is linear or weakly non-linear. Beyond this, our principal result is that f() does affect halo abundances, the halo spin parameter and the concentration-mass relationship in an environment-independent way, whereas we find no appreciable deviation from \text{ΛCDM} for the mass function with fixed environment density, nor the alignment of the orientation and spin vectors of the halo to the eigenvectors of the local cosmic web. There is a general trend for greater deviation from \text{ΛCDM} in underdense environments and for high-mass haloes, as expected from chameleon screening. |
| first_indexed | 2024-03-07T05:53:59Z |
| format | Journal article |
| id | oxford-uuid:e9e1cf43-aaf9-48fe-a160-a282ac06f5c3 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:53:59Z |
| publishDate | 2017 |
| publisher | Institute of Physics |
| record_format | dspace |
| spelling | oxford-uuid:e9e1cf43-aaf9-48fe-a160-a282ac06f5c32022-03-27T10:57:32ZThe f(ℛ) halo mass function in the cosmic webJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e9e1cf43-aaf9-48fe-a160-a282ac06f5c3Symplectic Elements at OxfordInstitute of Physics2017Braun-Bates, FWinther, HAlonso, DDevriendt, JAn important indicator of modified gravity is the effect of the local environment on halo properties. This paper examines the influence of the local tidal structure on the halo mass function, the halo orientation, spin and the concentration-mass relation. We use the excursion set formalism to produce a halo mass function conditional on large-scale structure. Our simple model agrees well with simulations on large scales at which the density field is linear or weakly non-linear. Beyond this, our principal result is that f() does affect halo abundances, the halo spin parameter and the concentration-mass relationship in an environment-independent way, whereas we find no appreciable deviation from \text{ΛCDM} for the mass function with fixed environment density, nor the alignment of the orientation and spin vectors of the halo to the eigenvectors of the local cosmic web. There is a general trend for greater deviation from \text{ΛCDM} in underdense environments and for high-mass haloes, as expected from chameleon screening. |
| spellingShingle | Braun-Bates, F Winther, H Alonso, D Devriendt, J The f(ℛ) halo mass function in the cosmic web |
| title | The f(ℛ) halo mass function in the cosmic web |
| title_full | The f(ℛ) halo mass function in the cosmic web |
| title_fullStr | The f(ℛ) halo mass function in the cosmic web |
| title_full_unstemmed | The f(ℛ) halo mass function in the cosmic web |
| title_short | The f(ℛ) halo mass function in the cosmic web |
| title_sort | f r halo mass function in the cosmic web |
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