Pettorino

Neutrino Clustering in Interacting Dark Energy Cosmologies
Valeria Pettorino (Institut für Theoretische Physik)

The case for an interaction between Dark Energy and other components in the Universe (matter, neutrinos, gravity) has recently been object of a wide variety of investigations, aiming at a better understanding of the dark energy issue via its coupling to other species. Within the framework of interacting dark energy, we consider the case in which quintessence interacts with neutrinos, the latter being characterized by a mass that increases with time. We show how growing neutrino cosmologies, which might naturally lead to the observed amount of dark energy today, can be characterized by a substantial neutrino clustering on the scales of superclusters. The presence of neutrino lumps, partially dragging the clustering of dark matter, could represent a peculiar feature of growing neutrino scenarios, possibly detectable via an imprint on the CMB-fluctuations or through the gravitational potential. If observed, large scale non-linear structures might be an indication of a new attractive cosmological interaction.