The $f(R)$ halo mass function in the cosmic web

Abstract

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 generalise the excursion set formalism to produce a halo mass function conditional on large-scale structure. Our 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 $f(R)$ 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 $\Lambda$CDM 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 $\Lambda$CDM in underdense environments and for high-mass haloes, as expected from chameleon screening.

31 pages, 13 figures

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• Joint halo mass function for modified gravity and massive neutrinos I: simulations and cosmological forecasts
• Nonlinear evolution of initially biased tracers in modified gravity
• Breaking cosmic degeneracies: Disentangling neutrinos and modified gravity with kinematic information
• The SRG-eROSITA All-Sky Survey : Constraints on f(R) Gravity from Cluster Abundance
• Universality of the halo mass function in screened gravity theories
• Bending the web: exploring the impact of modified gravity on the density field and halo properties within the cosmic web
• Cluster gravitational redshifts: uncertainties and survey requirements
• Universality of the halo mass function in modified gravity cosmologies