Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/05/012
Keywords
axions; cosmological perturbation theory; primordial black holes; string theory and cosmology
Funding
- Walter Haefner Foundation
- ETH Zurich Foundation
- Simons Foundation fellowship
- NSERC
- Canada Research Chair program
- MSRT fellowship from Iran
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We study the preheating of gauge fields in a simple axion monodromy model and compute the induced entropy perturbations and their effect on the curvature fluctuations. We find that the correction to the spectrum of curvature perturbations has a blue spectrum with index n(s) = 5/2. Hence, these induced modes are harmless for the observed structure of the universe. Since the spectrum is blue, there is the danger of overproduction of primordial black holes. However, we show that the observational constraints are easily satisfied.
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