The causal effect of environment on halo mass and concentration

  title={The causal effect of environment on halo mass and concentration},
  author={Corentin Cadiou and Andrew Pontzen and Hiranya V. Peiris and Luisa Lucie-Smith},
  journal={Monthly Notices of the Royal Astronomical Society},
Understanding the impact of environment on the formation and evolution of dark matter haloes and galaxies is a crucial open problem. Studying statistical correlations in large simulated populations sheds some light on these impacts, but the causal effect of an environment on individual objects is harder to pinpoint. Addressing this, we present a new method for resimulating a single dark matter halo in multiple large-scale environments. In the initial conditions, we ‘splice’ (i.e. insert) the… 

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