Exploiting cross correlations and joint analyses
The nature of the dark energy thought to be causing the accelerating expansion of the Universe is one of the most compelling questions in all of science. Any of the explanations for the accelerated expansion, whether a new field, a negative pressure fluid, or a modification to General Relativity will signal new physics and have a profound effect on our understanding of the Universe. The current observational constraints on dark energy and modifications to gravity still allow for a large range of models and theoretical explanations. Given the importance of dark energy, we must attack the problem from a variety of angles, taking advantage of cross-correlations between and joint analyses of different probes, missions, wavelengths, and surveys, to enable the most stringent cosmological constraints.
© 2014 Elsevier B.V. Received 9 November 2013, Revised 24 February 2014, Accepted 28 February 2014, Available online 19 March 2014. The authors gratefully acknowledge helpful contributions from and productive discussions with Matthew Becker, Tomasz Biesziadzinski, Brandon Erickson, August Evrard, Jaime Forero-Romero, Dragan Huterer, Stephen Kent, James Kowalkowski, Rachel Mandelbaum, Michael Mortonson, Marc Paterno, Adrian Pope, Erin Sheldon, Matthew Turk and Ben Mazin. JR is supported by JPL, run under a contract for NASA by Caltech.