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arXiv · 1405.4868

GUT-scale inflation with sizeable tensor modes

Felix Brummer·Valerie Domcke·Veronica Sanz
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Abstract

A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would imply a scale of inflation at the typical scale of supersymmetric grand unification. This could be an accident, or strong support for supersymmetric theories. Models of F-term hybrid inflation naturally connect the GUT scale with the inflationary scale, but they also predict the tensor-to-scalar ratio to be unmeasurably small. In this work we analyze a general UV embedding of F-term hybrid inflation into a supergravity theory with a general Kahler potential. The CMB observables are generated during the early phase of inflation, at large inflaton values, where the potential is dominated by Planck-suppressed operators. Tuning the leading higher-order terms can give an inflaton potential with sizeable tensor fluctuations and a field excursion which is still sub-Planckian but close to the Planck scale, as expected from the Lyth bound.

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Felix Brummer, Valerie Domcke, Veronica Sanz. 2014-09-16. GUT-scale inflation with sizeable tensor modes. https://doi.org/10.1088/1475-7516%2F2014%2F08%2F066

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