Signatures of a Graviton Mass in the Cosmic Microwave Background - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: There exist consistent low energy effective field theories describing gravityin the Higgs phase that allow the coexistence of massive gravitons and theconventional 1-r potential of gravity. In an effort to constrain the value ofthe graviton mass in these theories, we study the tensor contribution to theCMB temperature anisotropy and polarization spectra in the presence of anon-vanishing graviton mass. We find that the observation of a B-mode signalconsistent with the spectrum predicted by inflationary models would provide thestrongest limit yet on the mass of an elementary particle - a graviton - at alevel of m\lesssim 10^-30 eV\approx10 Mpc^-1. We also find that agraviton mass in the range between 10 Mpc^-1 and 10 kpc^-1 leads tointeresting modifications of the polarization spectrum. The characteristicsignature of a graviton mass in this range would be a plateau in the B-modespectrum up to angular multipoles of l\sim 100. For even larger values of thegraviton mass the tensor contribution to the CMB spectra becomes stronglysuppressed.



Author: Sergei Dubovsky, Raphael Flauger, Alexei Starobinsky, Igor Tkachev

Source: https://arxiv.org/



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