Parity-odd Neutrino Torque Detection

Abstract

Cosmological observations are promising ways to improve our understanding of neutrino mass properties. The upper bound on the sum of masses is given by the cosmic microwave background and large scale structure. These measurements are all parity-even, and potentially contaminated by unmodeled baryonic effects. In this paper we propose a novel parity-odd gravitational effect of neutrinos: A unique contribution to the directions of the angular momentum field of galaxies and halos. This observable is free of contamination in linear perturbation theory, and thus likely more cleanly separated from other nongravitational effects. A deep 21-cm survey to redshift 1 can potentially yield a $5\sigma$ significance on neutrino mass detection for a fiducial sum of neutrino masses of 0.05 eV.

6 pages, 1 figure. Matches publication version on PRD

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• Spin conservation of cosmic filaments
• Measuring dark matter-neutrino relative velocity on cosmological scales
• Hybrid multi-fluid-particle simulations of the cosmic neutrino background
• Baryonic Effects on Lagrangian Clustering and Angular Momentum Reconstruction
• Spin Mode Reconstruction in Lagrangian Space
• Spin speed correlations and the evolution of galaxy-halo systems
• Galaxy Spin Classification I: Z-wise vs S-wise Spirals With Chirality Equivariant Residual Network
• Correlating galaxy shapes and initial conditions: an observational study
• The Density Parity Model for the Evolution of the Subhalo Inner Spin Alignments with the Cosmic Web
• Cosmological neutrino N-body simulations of dark matter halo
• Cosmological Simulations with Massive Neutrinos: Efficiency and Accuracy
• Slow neutrinos: non-linearity and momentum-space emulation
• Effect of Neutrinos on Angular Momentum of Dark Matter Halo