发表机构
Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University; School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences; Department of Mathematics and Physics, Huai’an University（天津大学理学院量子联合研究中心及物理系; 中国科学院大学杭州高等研究院基础科学与数学学院; 淮阴师范学院数学与物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对PTA观测中TSIGWs的模型与参数简并问题，计算其二阶TSIGWs的能量密度谱及首个相关各向异性角功率谱，为区分TSIGWs与其他SGWB源提供了新工具。
AI 中文摘要
小尺度上的原初曲率和张量扰动可通过标量-标量、张量-标量、张量-张量源项产生二阶张量-标量诱导引力波（TSIGWs），TSIGWs被认为是随机引力波背景（SGWB）观测的主要贡献源之一。我们研究了存在非高斯原初曲率扰动时二阶TSIGWs的能量密度谱，还首次计算了与二阶TSIGWs相关的各向异性角功率谱，这为区分它们与其他SGWB源提供了有前景的工具。
英文摘要
Large primordial curvature and tensor perturbations on small scales can generate second-order tensor-scalar induced gravitational waves (TSIGWs) through scalar-scalar, tensor-scalar, and tensor-tensor source terms. TSIGWs are recognized as one of the principal contributors to the stochastic gravitational wave background (SGWB) observations. We explore the energy density spectrum of second-order TSIGWs in the presence of non-Gaussian primordial curvature perturbations. Furthermore, we present the first calculation of the anisotropic angular power spectrum associated with second-order TSIGWs, which provides a promising tool to discriminate them from other SGWB sources.
Comments28 pages, 7 figures, 1 table
