Tensor bispectrum mediated by an excited scalar field during inflation
We calculate the tensor bispectrum mediated by an excited scalar field during inflation and find that the bispectrum peaks in the squeezed configuration, which is different from that of gravitational waves induced by enhanced curvature perturbations reentering the horizon in the radiation-dominated era. Measuring the bispectrum provides a promising way to distinguish the stochastic gravitational-wave background generated during inflation from that generated after inflation.
Authors
- Cheng-Jun Fang (ORCID: https://orcid.org/0009-0001-5675-8537)
- Zhi-Zhang Peng (ORCID: https://orcid.org/0000-0001-9857-5504)
- Zong-Kuan Guo
Institutions
- Chinese Academy of Sciences (CN)
- Beijing Normal University (CN)
- Institute of Theoretical Physics (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-08-30
- DOI
- https://doi.org/10.1103/physrevd.110.043538
- Citations
- 3
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 0.99
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China