Parity-violating primordial gravitational waves from null energy condition violation-Reference-Cited by-同舟云学术

Parity-violating primordial gravitational waves from null energy condition violation

Published:2024-09-12 Issue:9 Volume:2024 Page:
ISSN:1029-8479
Container-title:Journal of High Energy Physics
language:en
Short-container-title:J. High Energ. Phys.

Author:

Jiang Zi-Wei,Cai Yong^ORCID,Wang Fei,Piao Yun-Song

Abstract

Abstract We investigate the parity-violating effects in primordial gravitational waves (GWs) due to null energy condition (NEC) violation in two very early universe scenarios: bounce-inflation and intermediate NEC violation during inflation. In both scenarios, we numerically solve the power spectra of parity-violating primordial GWs generated by coupling the background field and the spectator field with the Nieh-Yan term, respectively. We find that the background field can significantly enhance parity-violating effects at scales corresponding to the maximum of the GW power spectra. In contrast, the parity-violating effects produced by the spectator show significantly weaker observability even if the coupling constant is large. Therefore, in NEC-violating scenarios, the significant observable parity-violating effects in primordial GWs primarily arise from the physics directly related to NEC violation. This result highlights the potential of primordial GWs as crucial tools for exploring NEC-violating and parity-violating physics.

Publisher

Springer Science and Business Media LLC

Link

https://link.springer.com/content/pdf/10.1007/JHEP09(2024)067.pdf

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