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I construct a class of single small field models of inflation that canpredict an observable gravitational wave signal in the cosmic microwavebackground anisotropoies, contrary to popular wisdom. The spectral index, itsrunning, the tensor to scalar ratio and the number of e-folds can cover all theparameter space currently allowed by cosmological observations. A uniquefeature of models in this class is their ability to predict a negative spectralindex running in accordance with recent cosmic microwave backgroundobservations. I comment on the new class of models from an effective fieldtheory perspective and show that if the dimensionless trilinear coupling issmall, as required for consistency, then the observed spectral index runningimplies a high scale of inflation and hence an observable gravitational wavesignal.

Observable Gravitational Waves and Spectral Index Running in Small Single Field Inflationary Models