Twisted inflation

doi:10.1088/1475-7516/2010/09/032

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Twisted inflation

2010-09-29

DOI：10.1088/1475-7516/2010/09/032

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Abstract

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We present a new mechanism for slow-roll inflation based on higher dimensional supersymmetric gauge theory compactified to four dimensions with twisted (supersymmetry breaking) boundary conditions. These boundary conditions lead to a potential for directions in field space that would have been flat were supersymmetry preserved. For field values in these directions much larger than the supersymmetry-breaking scale, the flatness of the potential is nearly restored. Starting in this nearly flat region, inflation can occur as the theory relaxes towards the origin of field space. Near the origin, the potential becomes steep and the theory quickly descends to a confining gauge theory in which the inflaton does not exist as a particle. This confining gauge theory could be part of the Standard Model (QCD) or a natural dark matter sector; we comment on various scenarios for reheating. As a specific illustration of this mechanism, we discuss 4+1 dimensional maximally supersymmetric gauge theory on a circle with antiperiodic boundary condtions for fermions. When the theory is weakly coupled at the compactification scale, we calculate the inflation potential directly in field theory by integrating out the heavy W-bosons and their superpartners. At strong coupling the model can be studied using a gravity dual, which realizes a new model of brane inflation on a non-supersymmetric throat geometry. Predictions from our model with minimal coupling to gravity are consistent with present observations, and imply a small tensor-to-scalar ratio.

Keywords:

inflation

string theory and cosmology

supersymmetry and cosmology

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