Work

Bispectrum of induced gravitational waves in the poltergeist mechanism

Year: 2025

Type: article

Abstract: In the poltergeist mechanism the enhancement of induced gravitational waves (GWs) occurs due to a sudden transition from an early matter-dominated era to the radiation-dominated era. In this work, we calculate the bispectrum of induced GWs from the poltergeist mechanism by adopting the sudden transition approximation. We find that the tensor bispectrum peaks either in the equilateral or squeezed configurations, depending on scales. Such a characteristic behavior enables us to distinguish it from that from other GW generation mechanisms.

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

DOI: 10.1103/j3nw-rt5p

Authors: Han-Wen Hu, Cheng-Jun Fang, Zhen-Min Zeng, Zong-Kuan Guo

Institution: 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, G6009552194