Work

Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations

Year: 2026

Type: preprint

Abstract: 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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.01193

Authors: Wu, Peng-Yu, Wu, Di, Zhou, Jing-Zhi

Institutions: Tianjin University, University of Chinese Academy of Sciences, Huai'an University

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7206149656

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