Axion Cosmology and the Energy Scale of Inflation

Details Axion Cosmology and the Energy Scale of Inflation Axion Cosmology and the Energy Scale of Inflation

2008-07-11

arxiv.org/abs/0807.1726v3

Phys.Rev.D78:083507,2008

Astronomy and Astrophysics

Astrophysics

10 PRD pages, 4 figs, V3: updated to match published version

Scientific paper

10.1103/PhysRevD.78.083507

We survey observational constraints on the parameter space of inflation and axions and map out two allowed windows: the classic window and the inflationary anthropic window. The cosmology of the latter is particularly interesting; inflationary axion cosmology predicts the existence of isocurvature fluctuations in the CMB, with an amplitude that grows with both the energy scale of inflation and the fraction of dark matter in axions. Statistical arguments favor a substantial value for the latter, and so current bounds on isocurvature fluctuations imply tight constraints on inflation. For example, an axion Peccei-Quinn scale of 10^16 GeV excludes any inflation model with energy scale > 3.8*10^14 GeV (r > 2*10^(-9)) at 95% confidence, and so implies negligible gravitational waves from inflation, but suggests appreciable isocurvature fluctuations.

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