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2017

Bispectrum Modelling in Large Scale Structure - A Three Shape Model

Lazanu, Andrei

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We study the matter bispectrum of large structure by comparing theoretical models (perturbation theories and halo models) to numerical simulations using shape and amplitude correlators.

We show that among the perturbation theories at one loop the effective field theory of large scale structure extends the furthest into the non-linear regime.
We analyse the one and two-loop bispectra in the renormalised perturbation theory and we show that there is a significant extension in the range where results are accurate when going to two loops.
In the case of the halo model, we show that there are deficiencies in the modelling of the two-halo term at redshifts z>0 that worsen in the past.

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