Haloes and voids in f(R) gravity

Authors

  • Baojiu Li,

    Corresponding author
    1. Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE
    2. DAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA
    3. Kavli Institute for Cosmology Cambridge, Madingley Road, Cambridge CB3 0HA
    4. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA
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  • Gong-Bo Zhao,

    Corresponding author
    1. Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX
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  • Kazuya Koyama

    Corresponding author
    1. Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX
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E-mail: baojiu.li@durham.ac.uk (BL); gong-bo.zhao@port.ac.uk (G-BZ); kazuya.koyama@port.ac.uk (KK)

ABSTRACT

In this paper, we study the distribution of dark matter haloes and voids using high-resolution simulations in f(R) gravity models with the chameleon mechanism to screen the fifth force in a dense environment. For dark matter haloes, we show that the semi-analytic thin-shell condition provides a good approximation to describe the mass and environmental dependence of the screening of the fifth force in haloes. Due to stronger gravity, there are far more massive haloes and large voids in f(R) models compared with Λ cold dark matter (ΛCDM) models. The numbers of voids with an effective radius of 15 h−1 Mpc are twice and four times as many as those in ΛCDM for f(R) models with |fR0|= 10−5 and 10−4, respectively. This provides a new means to test the models using the upcoming observational data. We also find that haloes inside voids are significantly less screened in our simulations, and so are ideal objects for the gravity test.

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