Single-field inflation, anomalous enhancement of superhorizon fluctuations and non-Gaussianity in primordial black hole formation

Journal Article · Sun Jun 15 00:00:00 EDT 2008 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2008/06/024· OSTI ID:22156661

Saito, Ryo ^[1]; Yokoyama, Jun'ichi; Nagata, Ryo ^[2]

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1. Department of Physics, Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan)
2. Research Center for the Early Universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan)

We show a textbook potential for single-field inflation, namely the Coleman-Weinberg model can induce double inflation and formation of primordial black holes (PBHs), because fluctuations that leave the horizon near the end of first inflation are anomalously enhanced at the onset of second inflation when the time-dependent mode turns into a growing mode rather than a decaying mode. The mass of PBHs produced in this mechanism with an appreciable density are distributed at certain intervals depending on the model parameters. We also calculate the effects of non-Gaussian statistics due to higher-order interactions on the abundance of PBHs, which turns out to be small.

• OSTI ID: 22156661
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BLACK HOLES
DENSITY
GAUSS FUNCTION
INFLATIONARY UNIVERSE
MASS
TIME DEPENDENCE