“School of Astronomy”
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Paper IPM / Astronomy / 12602  


Abstract:  
We consider a model of inflation consisting a single fluid with a timedependent equation of state. In this phenomenological picture, two periods of inflation are separated by an intermediate noninflationary
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 nontrivial sinusoidal modulations.
This can have interesting observational implications for CMB anisotropies and for primordial blackhole formation.
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