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Multiple Inflationary Stages with Varying Equation of State
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abstract
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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The Dual Primordial Black Hole Formation Scenario
A single small-scale perturbation can form ultralight black holes during a break in inflation and heavier black holes after inflation, linking reheating to dark matter.
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