The ƒ(R) halo mass function in the cosmic web

Francesca von Braun-Bates, Hans A. Winther, David Alonso, Julien E. Devriendt

Research output: Contribution to journalArticlepeer-review

45 Downloads (Pure)

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 ƒ(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 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 ΛCDM in underdense environments and for high-mass haloes, as expected from chameleon screening.
Original languageEnglish
Article number012
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number3
DOIs
Publication statusPublished - 7 Mar 2017

Keywords

  • modified gravity
  • cosmic web
  • cosmological simulations

Fingerprint

Dive into the research topics of 'The <i>ƒ</i>(<i>R</i>) halo mass function in the cosmic web'. Together they form a unique fingerprint.

Cite this