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New shape of parity-violating graviton non-Gaussianity
- Title
- New shape of parity-violating graviton non-Gaussianity
- Authors
- Gong; Jinn-Ouk; Maria; Sasaki; Misao; Mylova
- Ewha Authors
- 공진욱
- SCOPUS Author ID
- 공진욱
- Issue Date
- 2023
- Journal Title
- Journal of High Energy Physics
- ISSN
- 1029-8479
- Citation
- Journal of High Energy Physics vol. 2023, no. 10
- Keywords
- de Sitter space; Effective Field Theories
- Publisher
- Springer Science and Business Media Deutschland GmbH
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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).
- DOI
- 10.1007/JHEP10(2023)140
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
- Files in This Item:
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JHEP10(2023)140.pdf(2.2 MB)
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