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2014

Separate Universe Simulations

Wagner, Christian, Schmidt, Fabian, Chiang, Chi-Ting et al.

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Understand

The large-scale statistics of observables such as the galaxy density are chiefly determined by their dependence on the local coarse-grained matter density.

This dependence can be measured directly and efficiently in N-body simulations by using the fact that a uniform density perturbation with respect to some fiducial background cosmology is equivalent to modifying the background and including curvature, i.e., by simulating a "separate universe".
We derive this mapping to fully non-linear order, and provide a step-by-step description of how to perform and analyse the separate universe simulations.
This technique can be applied to a wide range of observables.

Separate Universe Simulations · Around

Built on

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Then

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Wagner C., Schmidt F., Chiang C.-T., Komatsu E., 2014, in prep
Original
2014
Closest in time.

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