New shape of parity-violating graviton non-Gaussianity
- 주제(키워드) de Sitter space , Effective Field Theories
- 등재 SCIE, SCOPUS
- OA유형 Gold Open Access; Green Open Access
- 발행기관 Springer Science and Business Media Deutschland GmbH
- 발행년도 2023
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000213788
- 본문언어 영어
- Published As https://doi.org/10.1007/JHEP10(2023)140
초록/요약
We show that the general vacuum states that respect the de Sitter symmetry, known as the α-vacua, can introduce non-vanishing parity-violating tensor non-Gaussianities. This is due to the mixing by the Bogoliubov transformation of the positive and negative frequency modes of the Bunch-Davies vacuum. We calculate explicitly the bispectra of tensor perturbations and show that the amplitude can be exponentially enhanced for certain choices of the squeezing parameter α and the phase ϕ of the α-vacua. We find a new shape for the parity-violating tensor bispectrum which peaks in the flattened configuration. © 2023, The Author(s).
more