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Paper   IPM / Physic / 11774
School of Physics
  Title:   DBI Lifshitz Inflation
1.  M. Alishahiha
2.  H. Firouzjahi
3.  M.H. Namjoo
  Status:   Published
  Journal: JCAP
  Vol.:  08
  Year:  2011
  Pages:   028
  Supported by:  IPM
A new model of DBI inflation is introduced where the mobile brane, the inflaton field, is moving relativistically inside a Lifshitz throat with the arbitrary dynamical exponent z. The dependence of physical observable quantities, such as the spectral index, the ratio of the tensor to scalar amplitudes r and the non-Gaussianity parameter fNL, are calculated a functions of the exponent z. Depending on the value of z and the form of the inflaton potential the curvature perturbations can be red-tilted, scale invariant, or blue-tilted and significant amounts of non-Gaussianities can be produced.

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