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21 cm cosmology

Trobada 2015/2016 
 Monday, 21 December 2015 11:30
IFIC Seminar Room (1.1.1), Paterna (Valencia)
Francisco Villaescusa
Osservatorio di Trieste
I discuss the signatures left by massive neutrinos on the spatial distribution of neutral hydrogen (HI) in the post-reionization era 
by running hydrodynamic simulations that include massive neutrinos as additional collisionless particles. Our results show that HI
is more strongly clustered in cosmologies with massive neutrinos, while its abundance, ΩHI(z), is lower. These effects arise mainly
from the impact of massive neutrinos on cosmology: they suppress both the amplitude of the matter power spectrum on small
scales and the abundance of dark matter halos. Modelling the HI distribution with hydrodynamic simulations at z>3, and a simple
analytic model at z<3, we use the Fisher matrix formalism to conservatively forecast the constraints that Phase 1 of the
Square Kilometre Array (SKA) will place on the sum of neutrino masses.

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All Dates

  • Monday, 21 December 2015 11:30

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