Primordial black holes and induced gravitational waves from double-pole inflation

作者：Chengjie Fu, Shao-Jiang Wang · 发表于：Journal of Cosmology and Astroparticle Physics · 年份：2023 · DOI：10.1088/1475-7516/2023/06/012 · 被引用次数：28 · 研究领域：Cosmology and Gravitation Theories、Pulsars and Gravitational Waves Research、Geophysics and Gravity Measurements

Abstract The primordial black hole (PBH) productions from the inflationary potential with an inflection point usually rely heavily on the fine-tuning of the model parameters. We propose in this work a new kind of the α -attractor inflation with asymmetric double poles that naturally and easily lead to a period of non-attractor inflation, during which the PBH productions are guaranteed with less fine-tuning the model parameters. This double-pole inflation can be tested against the observational data in the future with rich phenomenological signatures: (1) the enhanced curvature perturbations at small scales admit a distinctive feature of ultraviolet oscillations in the power spectrum; (2) the quasi-monochromatic mass function of the produced PBHs can be made compatible to the asteroid-mass PBHs as the dominant dark matter component, the planet-mass PBHs as the OGLE ultrashort-timescale microlensing events, and the solar-mass PBHs as the LIGO-Virgo events; (3) the induced gravitational waves can be detected by the gravitational-wave detectors in space and Pulsar Timing Array/Square Kilometer Array.