tokens: We acknowledge valuable communications and discussions with F. Bouchet, C. Burigana, J. Dunkley, G. Efstathiou, K. Ganga, P. Naselsky, H. Peiris, C. Räth and D. Scott. GDS and CJC are supported by a grant from the US Department of Energy to the Particle Astrophysics Theory Group at CWRU. DH has been supported by the DOE, NSF, and the Michigan Center for Theoretical Physics. DJS is supported by the DFG grant RTG 1620 ‘Models of gravity’. DH thanks the Kavli Institute for Theoretical Physics and GDS thanks the Theory Unit at CERN for their respective hospitality. This work made extensive use of the healpix package (Górski et al. 2005 ). The numerical simulations were performed on the facilities provided by the Case ITS High Performance Computing Cluster. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA), part of the High Energy Astrophysics Science Archive Center (HEASARC). HEASARC/LAMBDA is a service of the Astrophysics Science Division at the NASA Goddard Space Flight Center. This paper made use of observations obtained with Planck ( http://www.esa.int/Planck ), an ESA science mission with instruments and contributions directly funded by ESA Member States, NASA, and Canada.
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