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Cluster abundance in chameleon f(R) gravity I: toward an accurate halo mass function prediction

Cataneo, Matteo; Rapetti, David; Lombriser, Lucas; Li, Baojiu

Cluster abundance in chameleon f(R) gravity I: toward an accurate halo mass function prediction Thumbnail


Authors

Matteo Cataneo

David Rapetti

Lucas Lombriser



Abstract

We refine the mass and environment dependent spherical collapse model of chameleon f(R) gravity by calibrating a phenomenological correction inspired by the parameterized post-Friedmann framework against high-resolution N-body simulations. We employ our method to predict the corresponding modified halo mass function, and provide fitting formulas to calculate the enhancement of the f(R) halo abundance with respect to that of General Relativity (GR) within a precision of lesssim 5% from the results obtained in the simulations. Similar accuracy can be achieved for the full f(R) mass function on the condition that the modeling of the reference GR abundance of halos is accurate at the percent level. We use our fits to forecast constraints on the additional scalar degree of freedom of the theory, finding that upper bounds competitive with current Solar System tests are within reach of cluster number count analyses from ongoing and upcoming surveys at much larger scales. Importantly, the flexibility of our method allows also for this to be applied to other scalar-tensor theories characterized by a mass and environment dependent spherical collapse.

Journal Article Type Article
Acceptance Date Dec 5, 2016
Online Publication Date Dec 13, 2016
Publication Date Dec 13, 2016
Deposit Date Aug 21, 2016
Publicly Available Date Dec 13, 2017
Journal Journal of Cosmology and Astroparticle Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2016
Issue 12
Article Number 024
DOI https://doi.org/10.1088/1475-7516/2016/12/024
Public URL https://durham-repository.worktribe.com/output/1377565
Related Public URLs http://arxiv.org/abs/1607.08788

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Copyright Statement
This is an author-created, un-copyedited version of an article published in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/1475-7516/2016/12/024






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