Robust μ-distortion constraints on primordial supermassive black holes from non-Gaussian perturbations
arxiv(2024)
摘要
Explaining the origin of supermassive black holes via a primordial origin is
severely challenged by the tight spectral distortion constraints on the
amplitude of the primordial perturbations. Following the first calculation of
how the μ constraints are modified by non-Gaussianity in a companion paper,
we here make the first robust constraints on primordial black hole formation
under large non-Gaussianity. Even the infinite f_ NL limit is
insufficiently non-Gaussian but much higher-order non-Gaussianity of the form
R= R_ G^5 may allow the formation of any mass primordial
black hole without conflicting with distortion constraints. We caution that
such extreme models face other challenges.
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