Speaker
Maria Archidiacono
(RWTH Aachen University)
Description
Within the next few years cosmological structure formation will be probed in greater detail than ever before by new and very large surveys, most notably EUCLID and LSST.
While this opens great possibilities for probing for example dark energy and the mass of neutrinos, it also puts very stringent requirements on theoretical calculations of cosmological observables, such as the matter power spectrum. In this regard, the treatment of massive neutrinos is particularly challenging both in N-body simulations and in linear theory Boltzmann codes.
In this talk I will present a new approximation to the third moment of the Boltzmann hierarchy and demonstrate that with this new approximation the neutrino power spectrum can be calculated with a precision of a few percent.
Then I will discuss an extremely efficient way of calculating the neutrino power spectrum in the regime of non-linear dark matter clustering: I will show that the derived neutrino power spectrum is consistent with what can be calculated in real space using N-body simulations.
Primary author
Maria Archidiacono
(RWTH Aachen University)
