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PreprintarXiv licencearXiv

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

  • Peng-Yu Wu
  • Di Wu
  • Jing-Zhi Zhou
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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.

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Cite

BibTeXRIS
BibTeX
@misc{wu2026angular,
  title = {{Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations}},
  author = {Peng-Yu Wu and Di Wu and Jing-Zhi Zhou},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.01193},
  eprint = {2609.01193},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.01193},
}
RIS
TY  - UNPB
TI  - Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations
AU  - Peng-Yu Wu
AU  - Di Wu
AU  - Jing-Zhi Zhou
PY  - 2026
DA  - 2026/09/01
PB  - arXiv
DO  - 10.48550/arxiv.2609.01193
UR  - https://arxiv.org/abs/2609.01193
AB  - 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.
ER  -