Interacting Dark Energy: Decay into Fermions

Abstract

A dark energy component is responsible for the present stage of acceleration of our universe. If no fine tuning is assumed on the dark energy potential then it will end up dominating the universe at late times and the universe will not stop this stage of acceleration. On the other hand, the equation of state of dark energy seems to be smaller than -1 as suggested by the cosmological data. We take this as an indication that dark energy does indeed interact with another fluid (we consider fermion fields) and we determine the interaction through the cosmological data and extrapolate it into the future. We study the conditions under which a dark energy can dilute faster or decay into the fermion fields. We show that it is possible to live now in an accelerating epoch dominated by the dark energy and without introducing any fine tuning parameters the dark energy can either dilute faster or decaying into fermions in the future. The acceleration of the universe will then cease.

10 pages

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Cited by in corpus (10)

• Time-varying neutrino mass from a supercooled phase transition: current cosmological constraints and impact on the ${\Omega }_m$-${\sigma }_8$ plane
• A single model of interacting dark energy: generalized phantom energy or generalized Chaplygin gas
• Interacting dark energy: generic cosmological evolution for two scalar fields
• Interacting holographic dark energy models: A general approach
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia
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• Avoiding parameter fine-tuning in mass varying neutrino models of DE?
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