Bispectrum from five-dimensional inflation
Abstract It was proposed that five-dimensional (5D) inflation can blow up the size of a compact dimension from the 5D Planck length to the micron size, as required by the dark dimension proposal, relating the weakness of the actual gravitational force to the size of the observable universe. Moreover...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-08-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP08(2025)163 |
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| _version_ | 1849226723236773888 |
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| author | Ignatios Antoniadis Auttakit Chatrabhuti Jules Cunat Hiroshi Isono |
| author_facet | Ignatios Antoniadis Auttakit Chatrabhuti Jules Cunat Hiroshi Isono |
| author_sort | Ignatios Antoniadis |
| collection | DOAJ |
| description | Abstract It was proposed that five-dimensional (5D) inflation can blow up the size of a compact dimension from the 5D Planck length to the micron size, as required by the dark dimension proposal, relating the weakness of the actual gravitational force to the size of the observable universe. Moreover, it was shown that 5D inflation can generate the (approximate) flat power spectrum of primordial density fluctuations consistent with present observations. Here we compute the bispectrum of primordial scalar perturbations and show that unlike the power spectrum, it differs from the four-dimensional case at all angular distances, due to the fact that in contrast to global dilatations, invariance under special conformal transformations is not restored at late times. Moreover there is an additional enhancement in the squeezed limit. |
| format | Article |
| id | doaj-art-679c3d30013f4d998c3bb4c853bbfadf |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-679c3d30013f4d998c3bb4c853bbfadf2025-08-24T11:04:18ZengSpringerOpenJournal of High Energy Physics1029-84792025-08-012025812810.1007/JHEP08(2025)163Bispectrum from five-dimensional inflationIgnatios Antoniadis0Auttakit Chatrabhuti1Jules Cunat2Hiroshi Isono3High Energy Physics Research Unit, Faculty of Science, Chulalongkorn UniversityHigh Energy Physics Research Unit, Faculty of Science, Chulalongkorn UniversityLaboratoire de Physique Théorique et Hautes Energies – LPTHE, Sorbonne Université, CNRSHigh Energy Physics Research Unit, Faculty of Science, Chulalongkorn UniversityAbstract It was proposed that five-dimensional (5D) inflation can blow up the size of a compact dimension from the 5D Planck length to the micron size, as required by the dark dimension proposal, relating the weakness of the actual gravitational force to the size of the observable universe. Moreover, it was shown that 5D inflation can generate the (approximate) flat power spectrum of primordial density fluctuations consistent with present observations. Here we compute the bispectrum of primordial scalar perturbations and show that unlike the power spectrum, it differs from the four-dimensional case at all angular distances, due to the fact that in contrast to global dilatations, invariance under special conformal transformations is not restored at late times. Moreover there is an additional enhancement in the squeezed limit.https://doi.org/10.1007/JHEP08(2025)163Cosmological modelsExtra DimensionsLarge Extra Dimensions |
| spellingShingle | Ignatios Antoniadis Auttakit Chatrabhuti Jules Cunat Hiroshi Isono Bispectrum from five-dimensional inflation Journal of High Energy Physics Cosmological models Extra Dimensions Large Extra Dimensions |
| title | Bispectrum from five-dimensional inflation |
| title_full | Bispectrum from five-dimensional inflation |
| title_fullStr | Bispectrum from five-dimensional inflation |
| title_full_unstemmed | Bispectrum from five-dimensional inflation |
| title_short | Bispectrum from five-dimensional inflation |
| title_sort | bispectrum from five dimensional inflation |
| topic | Cosmological models Extra Dimensions Large Extra Dimensions |
| url | https://doi.org/10.1007/JHEP08(2025)163 |
| work_keys_str_mv | AT ignatiosantoniadis bispectrumfromfivedimensionalinflation AT auttakitchatrabhuti bispectrumfromfivedimensionalinflation AT julescunat bispectrumfromfivedimensionalinflation AT hiroshiisono bispectrumfromfivedimensionalinflation |