Apr 18 – 22, 2011
Palais des Papes, Avignon
Europe/Paris timezone

The Coincidence Problem in a Phantom Cyclic Model of the Universe

Apr 19, 2011, 6:00 PM
Chambre du Trésorier (Palais des Papes, Avignon)

Chambre du Trésorier

Palais des Papes, Avignon


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.

Primary authors

Ms Hui-Yiing Chang (Vanderbilt University) Dr Robert Scherrer (Vanderbilt University)

Presentation materials