Primordial black holes in non-Gaussian regimes
185 citations recorded by the source corpus.
Primordial black holes (PBHs) can form in the early Universe from the collapse of rare, large density fluctuations. They have never been observed, but this fact is enough to constrain the amplitude of fluctuations on very small scales which cannot be otherwise probed. Because PBHs form only in very rare large fluctuations, the number of PBHs formed is extremely sensitive to changes in the shape of the tail of the fluctuation distribution - which depends on the amount of non-Gaussianity present. We first study how local non-Gaussianity of arbitrary size up to fifth order affects the abundance and constraints from PBHs, finding that they depend strongly on even small amounts of non-Gaussianity and the upper bound on the allowed amplitude of the power spectrum can vary by several orders of magnitude. The sign of the non-linearity parameters (f_{NL}, g_{NL}, etc) are particularly important. We also study the abundance and constraints from PBHs in the curvaton scenario, in which case the complete non-linear probability distribution is known, and find that truncating to any given order (i.e. to order f_{NL} or g_{NL}, etc) does not give accurate results.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/da4f4fe087af9bf3ad405e252bf797173d0b49a0
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Citations in the corpus
- Non-Gaussianity and the induced gravitational wave background (2021, background): “Note, however, that when considering the production of PBHs, non-Gaussianity has a significant impact on their abundance [105, 106].”
- Primordial black hole formation and abundance: contribution from the non-linear relation between the density and curvature perturbation (2019, methodology): “The most straight-forward method to calculate the abundance of PBHs from a nonGaussian distribution is to work instead with the Gaussian component of the perturbations [56, 57].”
- The exponential tail of inflationary fluctuations: consequences for primordial black holes (2019, background): “Non-Gaussianities may therefore play a crucial role in determining the abundance of PBHs [37–50] and, in this work, we provide a generic, non-perturbative framework to derive the tails of the PDFs of curvature perturbations.”
- Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “[133] Sam Young and Christian Byrnes, “Primordial black holes in non-Gaussian regimes,” JCAP 1308, 052 (2013), arXiv:1307.”
- Primordial black holes as dark matter candidates (2021, background): “For certain models — such as the hybrid waterfall or simple curvaton models [98– 100] — it has even been shown that no truncation of non-Gaussian parameters can be made without changing the estimated PBH abundance [95].”
- Quantum diffusion during inflation and primordial black holes (2017, background): “Let us also note that another case where the PDF decays exponentially is in presence of large local non-Gaussianities, when the PDF is a χ2 distribution [64, 65].”
- Solar-mass primordial black holes explain NANOGrav hint of gravitational waves (2020, background): “Also, the inclusion of the intrinsic non-Gaussianity of the primordial curvature perturbations significantly affects fPBH [23, 133, 134].”
- Generating PBHs and small-scale GWs in two-field models of inflation (2020, background): “It is well known that non-Gaussianity strongly affect the primordial abundance of PBHs [113–119] and the SBGW [120].”
- Primordial black holes from inflation and non-Gaussianity (2018, background): “32) from (in this expression one should intend the variance σ2 RH as the renormalized one once the non-Gaussian contributions are as well summed up [40, 65])”