Neutrino Lump Fluid in Growing Neutrino Quintessence

TL;DR

This paper models neutrino lumps as effective particles in growing neutrino quintessence, showing they behave like cold dark matter coupled to dark energy, providing a simplified description of complex cosmological dynamics.

Contribution

It introduces a novel effective particle approach to describe neutrino lumps, simplifying the analysis of their interactions and behavior in dark energy models.

Findings

Neutrino lumps can be effectively modeled as particles.

The neutrino lump fluid acts like cold dark matter.

The approach offers potential applications for composite object fluids.

Abstract

Growing neutrino quintessence addresses the "why now" problem of dark energy by assuming that the neutrinos are coupled to the dark energy scalar field. The coupling mediates an attractive force between the neutrinos leading to the formation of large neutrino lumps. This work proposes an effective, simplified description of the subsequent cosmological dynamics. We treat neutrino lumps as effective particles and investigate their properties and mutual interactions. The neutrino lump fluid behaves as cold dark matter coupled to dark energy. The methods developed here may find wider applications for fluids of composite objects.