Complex Scalar Field Reheating and Primordial Black Hole production

We study perturbations of a complex scalar field during reheating with no self-interaction in the regime \( \mu \gg H\), when the scalar field has a fast oscillatory behaviour (close to a pressure-less fluid). We focus on the precise determination of the instability scale and find it differs from th...

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Bibliographic Details
Published in:arXiv.org 2021-06
Main Authors: Carrion, Karim, Hidalgo, Juan Carlos, Montiel, Ariadna, Padilla, Luis E
Format: Article
Language:English
Subjects:
Expanding universe theory
Heating
Scalars
Online Access:Get full text
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Summary:We study perturbations of a complex scalar field during reheating with no self-interaction in the regime \( \mu \gg H\), when the scalar field has a fast oscillatory behaviour (close to a pressure-less fluid). We focus on the precise determination of the instability scale and find it differs from that associated with a real scalar field. We further look at the probability that unstable fluctuations form Primordial Black Holes (PBHs) obtaining a significant production of tiny PBHs which quickly evaporate and may subsequently leave a population of Planck-mass relics. We finally impose restrictions on the duration and energy scale of the fast oscillations period by considering that such relics constitute, at most, the totality of dark matter in the Universe.
ISSN:2331-8422
DOI:10.48550/arxiv.2101.02156