Interactions and Instabilities in Cosmology's Dark Sector
arXiv:0910.2695
Abstract
I consider couplings between the dark energy and dark matter sectors. I describe how the existence of an adiabatic regime, in which the dark energy field instantaneously tracks the minimum of its effective potential, opens the door for a catastrophic instability. This {\it adiabatic instability} tightly constrains a wide class of interacting dark sector models. This talk was presented at, and will appear in the proceedings of the DPF-2009 conference.
6 pages, 2 figures. Talk presented at the DPF-2009 Conference, Detroit, MI, July 27-31, 2009. To appear in the proceedings
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