DE3 - Large Scale Structure and Statistics |
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Speaker |
Dupuy, Hélène |
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| Talk Title |
A New Analytical Approach To Study Neutrinos Beyond The Linear Regime |
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Abstract |
Cosmological perturbation theory has proved to be particularly efficient to model the formation of the large-scale structure of the universe. Many refinements have been realized over the years in order to be in tune with the precision reached by observational cosmology. In particular, the effect of neutrinos on the linear matter power spectrum is now well understood. However, a robust analytic model of the impact of neutrinos on the nonlinear matter power spectrum is still missing. In this talk, I will present an attempt to remedy this. In particular, I will show that considering neutrinos as a collection of single-flow fluids allows to get rid of velocity dispersion. Eventually, it allows to extend the standard Newtonian formalism (i.e. the Vlasov-Poisson system, extended Galilean invariance, eikonal approximation, etc.) to the relativistic regime. Hopefully, this approach opens the way for the implementation of resummation techniques allowing to compute the next-to-leading order (or more…) contributions of neutrinos to the matter power spectrum. |
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