Structure Formation and Backreaction in Growing Neutrino Quintessence

Abstract

A dependence of the neutrino masses on the dark energy scalar field could provide a solution to the why now problem of dark energy. The dynamics of the resulting cosmological model, growing neutrino quintessence, include an attractive force between neutrinos substantially stronger than gravity. We present a comprehensive approach towards an understanding of the full cosmological evolution including the formation of large-scale neutrino structures. Important effects we account for are local variations in the dark energy and the backreaction on the background evolution, as well as relativistic neutrino velocities. For this aim, we develop a relativistic N-body treatment of the neutrinos combined with an explicit computation of the local quintessence field. At its current stage, the simulation method is successful until z ~ 1 and reveals a rich phenomenology. We obtain a detailed picture of the formation of large-scale neutrino structures and their influence on the evolution of matter, dark energy, and the late-time expansion of the universe.

18 pages, 12 figures. Inclusion of thermal neutrino velocities, comparison of different resolutions, larger simulation volume. Figures and text updated, conclusions unchanged

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• Quintessential inflation: A tale of emergent and broken symmetries
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• Dynamics of neutrino lumps in growing neutrino quintessence
• Hot big bang or slow freeze?
• Halo Formation from Yukawa Forces in the Very Early Universe
• Cosmology of strongly interacting fermions in the early universe
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• On-shell Lagrangian of an ideal gas
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• Early dark energy constraints on growing neutrino quintessence cosmologies
• Backreaction in Growing Neutrino Quintessence
• Observational Constraints on Early Coupled Quintessence
• Interacting dark energy: the role of microscopic feedback in the dark sector
• Deviations from the von Laue condition: Implications for the on-shell Lagrangian of particles and fluids
• Dark Energy Simulations
• Halos of dark energy