Weighing neutrinos with the halo environment

15 Jul 2019  ·  Banerjee Arka, Castorina Emanuele, Villaescusa-Navarro Francisco, Court Travis, Viel Matteo ·

Nonlinear objects like halos and voids exhibit a scale-dependent bias on linear scales in massive neutrino cosmologies. The shape of this scale-dependent bias is a unique signature of the neutrino masses, but the amplitude of the signal is generally small, of the order of $f_\nu$, the contribution of neutrinos to the total matter content ($\lesssim 1\%$)... In this paper, we demonstrate for the first time how the strength of this signal can be substantially enhanced by using information about the halo environment at a range of scales. This enhancement is achieved by using certain combinations of the large scale Cold Dark Matter and total matter environments of halos, both of which are measurable from galaxy clustering and weak lensing surveys. read more

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Cosmology and Nongalactic Astrophysics