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Paper   IPM / Astronomy / 12602
School of Astronomy
  Title:   Multiple Inflationary Stages with Varying Equation of State
1.  Mohammad Hossein Namjoo
2.  Hassan Firouzjahi
3.  Misao Sasaki
  Status:   Published
  Journal: JCAP
  Year:  2012
  Pages:   018
  Supported by:  IPM
We consider a model of inflation consisting a single fluid with a time-dependent equation of state. In this phenomenological picture, two periods of inflation are separated by an intermediate non-inflationary stage which can be either a radiation dominated, matter dominated or kinetic energy dominated universe, respectively, with the equation of state w=1/3, 0 or 1. We consider the toy model in which the change in w happens instantaneously. Depending on whether the mode of interest leaves the horizon before or after or between the phase transitions, the curvature power spectrum can have non-trivial sinusoidal modulations. This can have interesting observational implications for CMB anisotropies and for primordial black-hole formation.

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