Neutrino clustering in growing neutrino quintessence

TL;DR

This paper explores how growing neutrino masses can cause significant neutrino clustering, potentially influencing large-scale structure formation and providing insights into dark energy dynamics.

Contribution

It demonstrates that growing neutrino mass models lead to nonlinear neutrino lumps forming around redshift 1, affecting dark matter clustering and suggesting a new 'cosmon force'.

Findings

Neutrino lumps form at redshift z ~ 1.

Neutrino clustering can influence dark matter distribution.

Large-scale structures may reveal evidence of a new force.

Abstract

A growing neutrino mass can stop the dynamical evolution of a dark energy scalar field, thus explaining the 'why now' problem. We show that such models lead to a substantial neutrino clustering on the scales of superclusters. Nonlinear neutrino lumps form at redshift z \sim 1 and could partially drag the clustering of dark matter. If observed, large scale non-linear structures could be an indication for a new attractive 'cosmon force' stronger than gravity.