Work

Tensor bispectrum mediated by an excited scalar field during inflation

Year: 2024

Type: article

Abstract: 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.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.043538

Authors: Zhi-Zhang Peng, Cheng-Jun Fang, Zong-Kuan Guo

Institutions: Chinese Academy of Sciences, Beijing Normal University, Institute of Theoretical Physics, University of Chinese Academy of Sciences

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China

Awards: G3266504514, G3289481219, G4131717556