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Title: Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter

Abstract

Primordial black holes (PBHs) are black holes which may have formed very early on during the radiation dominated era in the early universe. We present here a method by which the large scale perturbations in the density of primordial black holes may be used to place tight constraints on non-gaussianity if PBHs account for dark matter (DM) . The presence of local-type non-gaussianity is known to have a significant effect on the abundance of primordial black holes, and modal coupling from the observed CMB scale modes can significantly alter the number density of PBHs that form within different regions of the universe, which appear as DM isocurvature modes. Using the recent Planck constraints on isocurvature perturbations, we show that PBHs are excluded as DM candidates for even very small local-type non-gaussianity, |f{sub NL}|≈0.001 and remarkably the constraint on g{sub NL} is almost as strong. Even small non-gaussianity is excluded if DM is composed of PBHs. If local non-Gaussianity is ever detected on CMB scales, the constraints on the fraction of the universe collapsing into PBHs (which are massive enough to have not yet evaporated) will become much tighter.

Authors:
;  [1]
  1. Department of Physics and Astronomy, University of Sussex, North-South Road, Brighton (United Kingdom)
Publication Date:
OSTI Identifier:
22525880
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; COUPLING; DENSITY; DISTURBANCES; LIMITING VALUES; NONLUMINOUS MATTER; RELICT RADIATION; UNIVERSE

Citation Formats

Young, Sam, and Byrnes, Christian T., E-mail: S.M.Young@sussex.ac.uk, E-mail: C.Byrnes@sussex.ac.uk. Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/04/034.
Young, Sam, & Byrnes, Christian T., E-mail: S.M.Young@sussex.ac.uk, E-mail: C.Byrnes@sussex.ac.uk. Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter. United States. doi:10.1088/1475-7516/2015/04/034.
Young, Sam, and Byrnes, Christian T., E-mail: S.M.Young@sussex.ac.uk, E-mail: C.Byrnes@sussex.ac.uk. Wed . "Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter". United States. doi:10.1088/1475-7516/2015/04/034.
@article{osti_22525880,
title = {Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter},
author = {Young, Sam and Byrnes, Christian T., E-mail: S.M.Young@sussex.ac.uk, E-mail: C.Byrnes@sussex.ac.uk},
abstractNote = {Primordial black holes (PBHs) are black holes which may have formed very early on during the radiation dominated era in the early universe. We present here a method by which the large scale perturbations in the density of primordial black holes may be used to place tight constraints on non-gaussianity if PBHs account for dark matter (DM) . The presence of local-type non-gaussianity is known to have a significant effect on the abundance of primordial black holes, and modal coupling from the observed CMB scale modes can significantly alter the number density of PBHs that form within different regions of the universe, which appear as DM isocurvature modes. Using the recent Planck constraints on isocurvature perturbations, we show that PBHs are excluded as DM candidates for even very small local-type non-gaussianity, |f{sub NL}|≈0.001 and remarkably the constraint on g{sub NL} is almost as strong. Even small non-gaussianity is excluded if DM is composed of PBHs. If local non-Gaussianity is ever detected on CMB scales, the constraints on the fraction of the universe collapsing into PBHs (which are massive enough to have not yet evaporated) will become much tighter.},
doi = {10.1088/1475-7516/2015/04/034},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2015,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}