Gravitational waves and dark radiation from dark phase transition: Connecting NANOGrav pulsar timing data and hubble tension

Yuichiro Nakai, Motoo Suzuki, Fuminobu Takahashi, Masaki Yamada

研究成果: Article査読

22 被引用数 (Scopus)

抄録

Recent pulsar timing data reported by the NANOGrav collaboration may indicate the existence of a stochastic gravitational wave background around f∼10−8 Hz. We explore a possibility to generate such low-frequency gravitational waves from a dark sector phase transition. Assuming that the dark sector is completely decoupled from the visible sector except via the gravitational interaction, we find that some amount of dark radiation should remain until present. The NANOGrav data implies that the amount of dark radiation is close to the current upper bound, which may help mitigate the so-called Hubble tension. If the existence of dark radiation is not confirmed in the future CMB-S4 experiment, it would imply the existence of new particles feebly interacting with the standard model sector at an energy scale of O(1 - 100) MeV.

本文言語English
論文番号136238
ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
816
DOI
出版ステータスPublished - 2021 5 10

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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