Can tensor-scalar induced GWs dominate PTA observations?

被引：0
作者：
Wu, Di [1 ]
Zhou, Jing-Zhi [2 ]
Kuang, Yu-Ting [3 ,4 ]
Li, Zhi-Chao [2 ,3 ]
Chang, Zhe [4 ]
Huang, Qing-Guo [1 ,4 ,5 ]
机构：
[1] UCAS, Sch Fundamental Phys & Math Sci, Hangzhou Inst Adv Study, Hangzhou 310024, Peoples R China
[2] Tianjin Univ, Sch Sci, Ctr Joint Quantum Studies, Dept Phys, Tianjin 300350, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[5] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100049, Peoples R China
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2025年 / 03期
基金：
中国国家自然科学基金;
关键词：
gravitational waves / theory; primordial gravitational waves (theory); Cosmological perturbation theory in GR and beyond; primordial black holes;
D O I：
10.1088/1475-7516/2025/03/045
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Observational constraints on small-scale primordial gravitational waves are considerably weaker than those on large scales. We focus on scenarios with significant primordial gravitational waves and curvature perturbations on small scales, studying the energy density spectrum of the second-order tensor-scalar induced gravitational waves (TSIGWs). By leveraging current data from cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and pulsar timing array (PTA), combined with the signal-to-noise ratio (SNR) analysis of Laser Interferometer Space Antenna (LISA), we can investigate how tensor-scalar induced gravitational waves affect observations on various scales, thus constraining the parameter space for primordial gravitational waves and curvature perturbations. The Bayes factor analysis suggests that tensor-scalar induced gravitational waves (TSIGWs)+primordial gravitational waves (PGWs) might be more likely to dominate current pulsar timing array (PTA) observations compared to supermassive black hole binary (SMBHB).
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页数：23
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