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Robust $\mu$-distortion constraints on primordial supermassive black holes from non-Gaussian perturbations
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abstract
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 $\mu$ 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 $f_{\rm NL}$ limit is insufficiently non-Gaussian but much higher-order non-Gaussianity of the form ${\cal R}={\cal R}_{\rm G}^5$ may allow the formation of any mass primordial black hole without conflicting with distortion constraints. We caution that such extreme models face other challenges.
Forward citations
Cited by 8 Pith papers
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The swallowed spike: the formation of light primordial black hole structures around heavy seeds
No torque mechanism studied supplies enough angular momentum for the innermost light-PBH shells around a heavy seed, so the spike core is swallowed and far less dense than a WIMP spike.
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Not-quite-primordial black holes
Modest small-scale density fluctuations can make halos at z>200 where CMB radiation suppresses molecular cooling, letting gas collapse directly into black hole seeds that match JWST counts.
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Primordial Black Hole mass growth from neutrinos during the radiation era
PBHs of ~1e3–1e7 solar masses can significantly grow by absorbing neutrinos before matter-radiation equality.
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Evading the CMB $\mu$-distortion bound on Supermassive Primordial Black Hole seeds with Non-Gaussian tails
Under the FIRAS μ-distortion variance cap, power-law and heavy log-normal PDF tails can yield seed-relevant PBH abundances, while Gaussian and ordinary exponential tails cannot.
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Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
Ultra-light primordial black holes that evaporate before Big Bang nucleosynthesis can still be probed through Planck-mass relics and early binary mergers, leaving a narrow window where relics make up all dark matter.
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Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies
Fitting a model of supermassive primordial black holes to JWST data at z=11 reproduces the excess of bright galaxies, but the agreement reflects parameter tuning rather than an independent test.
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Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO
LOFAR2.0, FAST Core Array and BINGO can constrain the PBH dark matter fraction f_PBH below 0.16-0.39 for masses above 10^{-2} to 10 solar masses via FRB lensing statistics.
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Tensor induced gravitational waves
Second-order tensor-induced gravitational waves can shift the inferred parameters of small-scale primordial gravitational wave models fitted to NANOGrav 15-year data, with one model favored by Bayes factors.
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