The CMB in a Causal Set Universe

Details The CMB in a Causal Set Universe The CMB in a Causal Set Universe

2007-11-19

arxiv.org/abs/0711.2904v1

Phys.Rev.D77:043002,2008

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevD.77.043002

We discuss Cosmic Microwave Background constraints on the causal set theory of quantum gravity, which has made testable predictions about the nature of dark energy. We flesh out previously discussed heuristic constraints by showing how the power spectrum of causal set dark energy fluctuations can be found from the overlap volumes of past light cones of points in the universe. Using a modified Boltzmann code we put constraints on the single parameter of the theory that are somewhat stronger than previous ones. We conclude that causal set theory cannot explain late-time acceleration without radical alterations to General Relativity.

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