Abstract
Abstract
The data recently released by the North American Nanohertz Observatory for Gravitational
Waves (NANOGrav) provides compelling evidence supporting the existence of a stochastic signal that
aligns with a gravitational-wave background. We show that the scalar-induced gravitational waves
from the Higgs inflation model with the parametric amplification mechanism can explain this
signal. Such a gravitational-wave background naturally predicts the substantial existence of
planet-mass primordial black holes, which can be planet 9 in our solar system and the lensing
objects for the ultrashort-timescale microlensing events observed by the Optical Gravitational
Lensing Experiment. Therefore, the NANOGrav signal, the potential Planet 9 in our solar system,
and the Optical Gravitational Lensing Experiment can be explained within the framework of Higgs
inflation.
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