来自曲率的原始黑洞:双峰分布的作用

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Tomotaka Kuroda, Atsushi Naruko, Vincent Vennin and Masahide Yamaguchi
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引用次数: 0

摘要

我们研究了膨胀的曲率模型中原始黑洞的形成,其中曲率扰动不仅由膨胀产生,而且由膨胀后衰减的光标量场(曲率)产生。在暴胀期间,由于哈勃半径之外的小规模真空波动,两个场都受到量子扩散的影响。暴胀之后,曲率是否主宰宇宙取决于暴胀结束时它的场值。由于该值是随机的,宇宙的不同区域经历不同的后暴胀历史。在实践中,我们表明这导致在这些模型中实现的e-fold数量的双峰分布。由于e折叠的数量与δN形式的曲率扰动有关,因此第二个峰的存在对我们讨论的原始黑洞具有重要的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Primordial black holes from a curvaton: the role of bimodal distributions
We investigate the formation of primordial black holes in curvaton models of inflation, where the curvature perturbation is not only generated by the inflaton but also by a light scalar field (the curvaton) that decays after inflation. During inflation, both fields are subject to quantum diffusion, owing to small-scale vacuum fluctuations crossing out the Hubble radius. After inflation, whether the curvaton dominates the universe or not depends on its field value when inflation ends. Since that value is stochastic, different regions of the universe undergo different post-inflationary histories. In practice, we show that this results in a double-peaked distribution for the number of e-folds realised in these models. Since that number of e-folds is related to the curvature perturbation by the δN formalism, the presence of a second peak has important consequences for primordial black holes that we discuss.
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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