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Insights into non-linear structure evolution from controlled linear initial conditions

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Confronting data from current and forthcoming cosmological surveys with theory requires an accurate understanding of non-linear gravitational evolution. Computer simulations are a vital tool for generating and testing this understanding, but suffer from a number of shortcomings. For example, the finite CPU time available generates a tension between the need for large volumes and for high resolution. Additionally, simulations essentially operate as a “black box”, generating only modest insight into the actual physics determining the non-linear clustering. I will discuss these shortcomings and show several new techniques designed to mitigate them, based on controlled modifications to the initial realisation of the linear gaussian random overdensity field. (This talk will be based on arXiv:1511.04090, arXiv:1603.05253 and will touch briefly on arXiv:1607.02507)

This talk is part of the Cosmology Lunch series.

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