Tilted Ghost Inflation

Abstract

In a ghost inflationary scenario, we study the observational consequences of a tilt in the potential of the ghost condensate. We show how the presence of a tilt tends to make contact between the natural predictions of ghost inflation and the ones of slow roll inflation. In the case of positive tilt, we are able to build an inflationary model in which the Hubble constant H is growing with time. We compute the amplitude and the tilt of the 2-point function, as well as the 3-point function, for both the cases of positive and negative tilt. We find that a good fraction of the parameter space of the model is within experimental reach.

14 pages, 2 figures; Corrected side comment on DBI Inflation; Corrected minor mistake in the definition of δ_{cr}

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