Author:
Nascimento Caio,Loverde Marilena
Abstract
Abstract
We develop a first-principles formalism to compute the distortion to the relic neutrino
density field caused by the peculiar motions of large-scale structures. This distortion slows
halos down due to dynamical friction, causes a local anisotropy in the neutrino-CDM
cross-correlation, and reduces the global cross-correlation between neutrinos and CDM. The local
anisotropy in the neutrino-CDM cross-spectrum is imprinted in the three point cross-correlations
of matter and galaxies, or the bispectrum in Fourier space, producing a signal peaking at squeezed
triangle configurations. This bispectrum signature of neutrino masses is not limited by cosmic
variance or potential inaccuracies in the modeling of complicated nonlinear and galaxy formation
physics, and it is not degenerate with the optical depth to reionization. We show that future
surveys have the potential to detect the distortion bispectrum.
Subject
Astronomy and Astrophysics