Imperial College London

Carlo R. Contaldi

Faculty of Natural SciencesDepartment of Physics

Professor of Theoretical Physics



+44 (0)20 7594 1527c.contaldi




505Huxley BuildingSouth Kensington Campus






BibTex format

author = {Thomas, DB and Contaldi, CR},
title = {Viability of the cluster mass function formalism in parametrised modified gravity},
url = {},
year = {2011}

RIS format (EndNote, RefMan)

AB - Model-independent parametrisations for examining departures from GeneralRelativity have been increasingly studied over the past few years. Variousobservables have been used to constrain the parameters and forecasts for futuresurveys have been carried out. In one such forecast, galaxy cluster counts wereused to constrain the parameters. Here, we carry out a limited set of $N$-bodysimulations, with a modified Poisson equation, to examine the accuracy ofexisting mass functions for modified gravity cosmologies. As well as alteringthe gravitational calculation, we include the effect of a screening scale toensure consistency of the theory with solar system tests. Our results suggestthat if a screening scale exists its effect can be taken into account in thecluster count calculation through its effect on the linear matter powerspectrum. If this is done, the accuracy of the standard mass function formalismin modified gravity theories with reasonably small departures from GeneralRelativity, as tested in this work, is comparable to the standard case.
AU - Thomas,DB
AU - Contaldi,CR
PY - 2011///
TI - Viability of the cluster mass function formalism in parametrised modified gravity
UR -
ER -