Influence of large local and non-local bispectra on primordial black hole abundance - INSPIRE

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Influence of large local and non-local bispectra on primordial black hole abundance

Dec 22, 2015

11 pages

Published in:

JCAP 02 (2016) 029

Published: Feb 10, 2016

e-Print:

1512.07224 [astro-ph.CO]

DOI:

10.1088/1475-7516/2016/02/029

View in:

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Abstract: (IOP)

Primordial black holes represent a unique probe to constrain the early universe on small scales—providing the only constraints on the primordial power spectrum on the majority of scales. However, these constraints are strongly dependent on even small amounts of non-Gaussianity, which is unconstrained on scales significantly smaller than those visible in the CMB. This paper goes beyond previous considerations to consider the effects of a bispectrum of the equilateral, orthogonal and local shapes with arbitrary magnitude upon the abundance of primordial black holes. Non-Gaussian density maps of the early universe are generated from a given bispectrum and used to place constraints on the small scale power spectrum. When small, we show that the skewness provides an accurate estimate for how the constraint depends on non-Gaussianity, independently of the shape of the bispectrum. We show that the orthogonal template of non-Gaussianity has an order of magnitude weaker effect on the constraints than the local and equilateral templates.

Note:

11 pages, 4 figures, updated to match published version in JCAP02(2016)029, Journal of Cosmology and Astroparticle Physics, Volume 2016, February 2016

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Figures(7)

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