Stochastic gravitational wave background detection using NANOGrav 15-year data set in the context of massive gravity

被引：0

作者：

Choi, Chris ^{[1
]}

Magallanes, Jacob ^{[1
]}

Gurgenidze, Murman ^{[1
,2
]}

Kahniashvili, Tina ^{[1
,2
,3
]}

机构：

[1] Carnegie Mellon Univ, McWilliams Ctr Cosmol & Astrophys, Dept Phys, Pittsburgh, PA 15213 USA

[2] Ilia State Univ, Sch Nat Sci & Med, Tbilisi, Georgia

[3] Abastumani Astrophys Observ, Tbilisi GE-0179, Georgia

来源：

PHYSICAL REVIEW D | 2024年 / 110卷 / 06期

关键词：

ELECTROWEAK PHASE-TRANSITION; BLACK-HOLES; COSMIC STRINGS; SEARCH; MODEL;

D O I：

10.1103/PhysRevD.110.063525

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Convincing evidence of a stochastic gravitational wave (GW) background has been found by the NANOGrav Collaboration in the 15-year data set. From this signal, we can evaluate the possibility of its source being from the early Universe through the tensor perturbations induced by a massive spin-2 graviton field. We consider a time-dependent model of the minimal theory of massive gravity and find values of the graviton mass, mass cutoff time, and Hubble rate of inflation that amplify the energy spectra of primordial GWs sufficiently to reproduce the signal from the NANOGrav data within 1-3 standard deviation. However, a suppression mechanism for high-frequency modes must be introduced to conservatively obey the big bang nucleosynthesis (BBN) bound. While there are regions of the parameter space that reproduce the signal, it remains a challenge to simultaneously respect the BBN and cosmic microwave background bounds without making the graviton mass cutoff time too deep into the matter-dominated era.

引用

页数：9

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