The measurement of a large tensor-to-scalar ratio by the BICEP2 experiment , r = 0.20 _ { -0.05 } ^ { +0.07 } , severely restricts the landscape of viable inflationary models and shifts attention once more towards models featuring large inflaton field values .
In this context , chaotic inflation based on a fractional power-law potential that is dynamically generated by the dynamics of a strongly coupled supersymmetric gauge theory appears to be particularly attractive .
We revisit this class of inflation models and find that , in the light of the BICEP2 measurement , models with a non-minimal gauge group behind the dynamical model seem to be disfavored , while the model with the simplest group , i.e . SU ( 2 ) , is consistent with all results .
We also discuss how the dynamical model can be distinguished from the standard chaotic inflation model based on a quadratic inflaton potential .