PBH dark matter from axion inflation
Apr 11, 2017
42 pages
Published in:
- JCAP 07 (2017) 048
- Published: Jul 27, 2017
e-Print:
- 1704.03464 [astro-ph.CO]
View in:
Citations per year
Abstract: (arXiv)
Protected by an approximate shift symmetry, axions are well motivated candidates for driving cosmic inflation. Their generic coupling to the Chern-Simons term of any gauge theory gives rise to a wide range of potentially observable signatures, including equilateral non-Gaussianites in the CMB, chiral gravitational waves in the range of direct gravitational wave detectors and primordial black holes (PBHs). In this paper we revisit these predictions for axion inflation models non-minimally coupled to gravity. Contrary to the case of minimally coupled models which typically predict scale-invariant mass distributions for the generated PBHs at small scales, we demonstrate how broadly peaked PBH spectra naturally arises in this setup. For specific parameter values, all of dark matter can be accounted for by PBHs.Note:
- 33 pages plus appendices, 9 figures
- inflation: model
- black hole: primordial
- coupling: minimal
- axion
- dark matter
- gravitational radiation detector
- cosmic background radiation
- gravitational radiation
- gravitational radiation: emission
- gauge field theory
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Figures(13)
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