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T: Fachverband Teilchenphysik

T 23: Theoretische Astroteilchenphysik und Kosmologie 2

T 23.7: Vortrag

Dienstag, 10. März 2009, 18:15–18:30, M114

Phenomenology of Hybrid Scenarios of Neutrino Dark Energy — Stefan Antusch¹, Subinoy Das², and •Koushik Dutta¹ — ¹Max Planck Institute for Physics, Fohringer Ring 6, 80805, Munich, Germnay — ²University of British Columbia, Department of Physics and Astronomy, 6224 Agricultural Rd, Vancouver, B.C, V6T 1Z1, Canada

We study the phenomenology of hybrid scenarios of neutrino dark energy, where in addition to a so-called Mass Varying Neutrino (MaVaN) sector a cosmological constant (from a false vacuum) is driving the accelerated expansion of the universe today. We calculate the effective equation of state parameter w_eff(z) for general power law potentials in terms of the neutrino mass scale and show that w_eff(z) is predicted to become smaller than -1 for z>0. We show that the hybrid scenario allows to realize neutrino dark energy with a high-scale seesaw and it can potentially evade the stability problem of neutrino dark energy models with non-relativistic neutrinos.