Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/12/024
Keywords
cluster counts; modified gravity; cosmological simulations
Funding
- BIS National E-infrastructure capital [ST/K00042X/1]
- STFC [ST/H008519/1, ST/K00087X/1]
- Danish National Research Foundation
- NASA Postdoctoral Program Senior Fellowship at the NASA Ames Research Center
- SNSF Advanced Postdoc. Mobility Fellowship [161058]
- STFC Consolidated Grant for Astronomy and Astrophysics at the University of Edinburgh
- STFC Consolidated [ST/L00075X/1, RF040335]
- STFC DiRAC Operations [ST/K003267/1]
- STFC [ST/I001573/1, ST/I00162X/1, ST/L00075X/1, ST/K00042X/1, ST/M007006/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I00162X/1, ST/I001573/1, ST/L00075X/1, ST/K00042X/1, ST/M007006/1] Funding Source: researchfish
Ask authors/readers for more resources
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 less than or similar to 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available