首页|Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data

Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data

JohnEllis ChunshanLin VilleVaskonen MarekLewicki

DOI：https://doi.org/10.1103/PhysRevD.108.103511

来源：

中国科学院科技论文预发布平台

Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data

JohnEllis ChunshanLin VilleVaskonen MarekLewicki

作者信息

摘要

demonstrates that the common-spectrum process is duecosmological phase transition [6].12.5-year data[13]that contained the first reportedevidence for a common spectrum process in the nHzrange [14-16] that was subsequently confirmed by otherPTAs「17-19].In this paper we revisit cosmic strings inmodate the updated NANOGrav data as well as otherders of magnitude in frequency,whereas the extensionof the SMBH binary model to higher frequencies is sub-ject to larger uncertainties [20].Our aim in this paper,therefore,is to explore the robustness of the cosmic stringpredictions and whether it can avoid making testable pre-dictions for higher-frequency GW detectors.

Abstract

We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension $G \mu \sim 10^{-12} - 10^{-11}$ and a string intercommutation probability $p \sim 10^{-3} - 10^{-1}$. Extrapolation to higher frequencies assuming standard Big Bang cosmology is compatible at the 68\% CL with the current LIGO/Virgo/KAGRA upper limit on a stochastic gravitational wave background in the 10 to 100 Hz range. The superstring interpretation of the NANOGrav data would be robustly testable by future experiments even in modified cosmological scenarios.

关键词

cosmic string/gravitational wave/pulsar timing array

Key words

cosmic string/gravitational wave/pulsar timing array

引用本文复制引用

JohnEllis,ChunshanLin,VilleVaskonen,MarekLewicki.Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data[EB/OL].(2024-09-27)[2025-11-20].https://chinaxiv.org/abs/202409.00247.

学科分类

物理学

首发时间： 2024-09-27

下载量：0

点击量：55

段落导航

Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data

Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data