Phantom Inflation and Primordial Perturbation Spectrum
  In this paper we study the inflation model driven by the phantom field. We propose a possible exit from phantom inflation to our observational cosmology by introducing an additional normal scalar field, similar to hybrid inflation model. Then we discuss the primordial perturbation spectra from various phantom inflation models and give an interesting compare with those of normal scalar field inflation models. 
Yun-Song Piao and Yuan-Zhong Zhang