Density Perturbations in Chain Inflation

Abstract

We consider the model of ``Chain Inflation,'' in which the period of inflation in our universe took the form of a long sequence of quantum tunneling events. We find that in the simplest such scenario, in which the tunneling processes are uniform, approximately 10^4 vacua per e-folding of inflation are required in order that the density perturbations produced are of an acceptable size. We arrive at this conclusion through a combination of analytic and numerical techniques, which could also serve as starting points for calculations with more general sets of assumptions.

28 pages, 16 figures; v2: corrected typos, increased resolution on D=2+1 data points

References in corpus (3)

• Particle Physics Models of Inflation and the Cosmological Density Perturbation
• Chain Inflation in the Landscape: "Bubble Bubble Toil and Trouble"
• Inflating with the QCD Axion

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