Cosmic coincidences and relic neutrinos

Abstract

A simple phenomenological description for the energy transfer between a variable cosmological constant (CC) and a gas of relic neutrinos in an expanding universe can account for a near coincidence between the neutrino and dark-energy densities to hold over a significant portion of the history of the universe. Although such a cosmological setup may promote neutrinos to mass-varying particles, both with slow and quick neutrino mass changing with the expansion of the universe naturally implemented in the model, it also works equally well for static neutrino masses. We also stress what sort of models for variable CC can potentially underpin the above scenario.

arXiv comment7 pages, LaTeX, based on the on the talk at IRGAC-2006 (Barcelona, July 11-15, 2006), accepted for publication in Journal of Physics A

References in corpus (11)

• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Effective Field Theory, Black Holes, and the Cosmological Constant
• Holographic dark energy and cosmic coincidence
• Dark Energy from Mass Varying Neutrinos
• Cosmological bounds on neutrino degeneracy improved by flavor oscillations
• Cosmic Structure Growth and Dark Energy
• Variable Cosmological Constant as a Planck Scale Effect
• Generalized holographic dark energy and the IR cutoff problem
• Dynamical dark energy with a constant vacuum energy density
• Mass-Varying Neutrinos from a Variable Cosmological Constant
• Relic gravitational waves and the generalized second law