The surprisingly large value of r, the ratio of power in tensor to scalar density perturbations in the CMB reported by the BICEP2 Collaboration, if confirmed, provides strong evidence for Inflation at the GUT scale. While the Inflationary signal remains the best motivated source, a large value of r alone would still allow for the possibility that a comparable gravitational wave background might result from a self ordering scalar field (SOSF) transition that takes place later at somewhat lower energy. We find that even without detailed considerations of the predicted BICEP signature of such a transition, simple existing limits on the isocurvature contribution to CMB anisotropies would definitively rule out a contribution of more than 5% to r = 0.2. We also present a general relation for the allowed fractional SOSF contribution to r as a function of the ultimate measured value of r. These results point strongly not only to an inflationary origin of the BICEP2 signal, if confirmed, but also to the fact that if the GUT scale is of order 1016 GeV then either the GUT transition happens before Inflation or the Inflationary transition and the GUT transition must be one and the same.
Details
- Killing the Straw Man: Does BICEP Prove Inflation at the GUT Scale?
- Dent, James B. (Author)
- Krauss, Lawrence (Author)
- Mathur, Harsh (Author)
- College of Liberal Arts and Sciences (Contributor)
- Digital object identifier: 10.1016/j.physletb.2014.07.046
- Identifier TypeInternational standard serial numberIdentifier Value0370-2693
- Identifier TypeInternational standard serial numberIdentifier Value1873-2445
- The final version of this article, as published in Physics Letters B, can be viewed online at: http://www.sciencedirect.com/science/article/pii/S0370269314005486?via%3Dihub
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Dent, J. B., Krauss, L. M., & Mathur, H. (2014). Killing the straw man: Does BICEP prove inflation at the GUT scale? Physics Letters B, 736, 305-307. doi:10.1016/j.physletb.2014.07.046