Ms Hui-Yiing Chang (Vanderbilt University)
In a phantom dark energy model, the energy density increases with the expansion of the Universe, allowing it to go through standard cycles of radiation/matter domination, followed by a dark energy/inflationary phase. There is a period in each cycle where the dark energy and matter densities are comparable. Since the cycles repeat infinitely, the Universe spends a substantial portion of its lifetime in such a state; this significantly ameliorates the coincidence problem.
Ms Hui-Yiing Chang (Vanderbilt University) Dr Robert Scherrer (Vanderbilt University)