Large tensor-to-scalar ratio and running of the scalar spectral index
  with Instep Inflation
  If a sizeable tensor-to-scalar ratio ~0.1 turns out to be detected and a
negative running of the scalar spectral index ~0.01 is significantly required
by the data, the vast majority of single field models of inflation will be
ruled out. We show that a flat tree-level effective potential, lifted by
radiative corrections and by the imprints of a high energy scale (in the form
of non-renormalizable operators) can explain those features and produce enough
inflation in the slow-roll regime.
