Translating nano-Hertz gravitational wave background into primordial perturbations taking account of the cosmological QCD phase transition

被引：34

作者：

Abe, Katsuya T. ^{[1
]}

Tada, Yuichiro ^{[2
,3
]}

机构：

[1] Chiba Univ, Ctr Frontier Sci, 1-33 Yayoi-cho,Inage Ku, Chiba 2638522, Japan

[2] Nagoya Univ, Inst Adv Res, Furo Cho,Chikusa Ku, Nagoya 4648601, Japan

[3] Nagoya Univ, Dept Phys, Furo Cho,Chikusa Ku, Nagoya 4648602, Japan

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 10期

关键词：

D O I：

10.1103/PhysRevD.108.L101304

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The evidence of the nano-Hertz stochastic gravitational wave (GW) background is reported by multiple pulsar timing array collaborations. While a prominent candidate of the origin is astrophysical from supermassive black hole binaries, alternative models involving GWs induced by primordial curvature perturbations can explain the inferred GW spectrum. Serendipitously, the nano-Hertz range coincides with the Hubble scale during the cosmological quantum chromodynamics (QCD) phase transition. The influence of the QCD phase transition can modify the spectrum of induced GWs within the nano-Hertz frequency range, necessitating careful analysis. We estimate GWs induced by power-law power spectra of primordial curvature perturbations taking account of the QCD phase transition. Then we translate the implication of the NANOGrav data into the constraint on the power spectrum of the primordial curvature perturbation, which suggests one would underestimate the amplitude by about 25% and the spectral index by up to 10% if neglecting the QCD effect.

引用

页数：7

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