2009

The pre-inflationary and inflationary fast-roll eras and their signatures in the low CMB multipoles

Destri, C., de Vega, H. J., Sanchez, N. G.

Understand

We study the entire coupled evolution of the inflaton and the scale factor for general initial conditions at a given initial time.

The generic early universe evolution has three stages: decelerated fast-roll followed by inflationary fast roll and then inflationary slow-roll.
This evolution is valid for all regular inflaton potentials.
In addition, we find a special (extreme) slow-roll solution starting at t = -infty in which the fast-roll stages are absent.

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