Testing modified gravity using a marked correlation function

Joaquín Armijo*, Yan Chuan Cai, Nelson Padilla, Baojiu Li, John A. Peacock

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In theories of modified gravity with the chameleon screening mechanism, the strength of the fifth force depends on environment. This induces an environment dependence of structure formation, which differs from Λ-cold-dark-matter (ΛCDM). We show that these differences could be captured by the marked correlation function. With the galaxy correlation functions and number densities calibrated to match between f(R) and ΛCDM models in simulations, we show that the marked correlation functions by using either the local galaxy number density or halo mass as the marks encode extra information, which can be used to test these theories. We discuss possible applications of these statistics in observations.

Original languageEnglish
Pages (from-to)3627-3632
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date21 May 2018
Publication statusPublished - 1 Aug 2018


  • Cosmology: theory
  • Dark energy
  • Large-scale structure of Universe


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