Neutrino Lump Fluid in Growing Neutrino Quintessence
  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.
