Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 95: Searches for Dark Matter III

T 95.2: Talk

Thursday, March 18, 2021, 16:15–16:30, Tt

Loop corrections to the power spectrum for massive neutrino cosmologies — Mathias Garny and •Petter Taule — Technical University of Munich

Mapping out the large-scale structure of the Universe is becoming a leading probe for precision cosmology. Current and near future surveys are expected to achieve unprecedented precision, and correspondingly a solid theoretical understanding is required in order to extract valuable information. Considerable efforts have been devoted in the recent years to model the weakly non-linear regime using perturbative methods. In this talk, I will describe an algorithm for computing loop corrections to the matter power spectrum that can be applied to a wide range of extended cosmological models, due to its capability of fully capturing time- and scale-dependence of the underlying fluid dynamics. I apply this framework to quantify the effect of massive neutrinos on the growth of structure, using a two-component fluid model for CDM+baryons and massive neutrinos. Finally, I compare the matter power spectrum at 2-loop in the presence of massive neutrinos obtained from this framework with simplified treatments that only take neutrinos into account linearly.