[[UTAPwiki/セミナー/初期宇宙・相対論速報]] * Inflationary bispectrum from symmetry and locality. [#ebdc19c4] ** Jason Kristiano [#sfc4e8ea] Abstract: Inflationary bispectrum was first derived by Maldacena in his famous paper [1]. Recently, inspired by the development of scattering amplitude in the particle physics community, some cosmologists are trying to derive inflationary bispectrum, or generally higher-point function, by only considering symmetries of cosmological perturbations. First, Nima Arkani-Hamed et. al. [2] successfully derived inflationary bispectrum by only using slightly broken de-Sitter space isometries. However, inflation generally breaks de-Sitter isometries, either small or large. For that motivation, Enrico Pajer et.al. [3-5] introduced a new bootstrap method without assuming de-Sitter isometries. In this seminar, I will review his method and compare the advantages and disadvantages to the previous one. References: [1] J. Maldacena, JHEP 05, 013 (2003). [2] N. Arkani-Hamed, et. al., JHEP 04, 105 (2020). [3] E. Pajer, JCAP 01, 023 (2021). [4] S. Jazayeri, et.al., arXiv: 2103.08649. [5] H. Goodhew et. al., JCAP 04, 021 (2021). |