Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields
Abstract If the graviton is the only high spin particle present during inflation, then the form of the observable tensor three-point function is fixed by de Sitter symmetry at leading order in slow-roll, regardless of the theory, to be a linear combination of two possible shapes. This is because the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-10-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP10(2019)182 |
| _version_ | 1818143712722550784 |
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| author | Garrett Goon Kurt Hinterbichler Austin Joyce Mark Trodden |
| author_facet | Garrett Goon Kurt Hinterbichler Austin Joyce Mark Trodden |
| author_sort | Garrett Goon |
| collection | DOAJ |
| description | Abstract If the graviton is the only high spin particle present during inflation, then the form of the observable tensor three-point function is fixed by de Sitter symmetry at leading order in slow-roll, regardless of the theory, to be a linear combination of two possible shapes. This is because there are only a fixed number of possible on-shell cubic structures through which the graviton can self-interact. If additional massive spin-2 degrees of freedom are present, more cubic interaction structures are possible, including those containing interactions between the new fields and the graviton, and self-interactions of the new fields. We study, in a model-independent way, how these interactions can lead to new shapes for the tensor bispectrum. In general, these shapes cannot be computed analytically, but for the case where the only new field is a partially massless spin-2 field we give simple expressions. It is possible for the contribution from additional spin-2 fields to be larger than the intrinsic Einstein gravity bispectrum and provides a mechanism for enhancing the size of the graviton bispectrum relative to the graviton power spectrum. |
| first_indexed | 2024-12-11T11:36:02Z |
| format | Article |
| id | doaj.art-92e4b896d86640f4a1d98de4ac27b84f |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-11T11:36:02Z |
| publishDate | 2019-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-92e4b896d86640f4a1d98de4ac27b84f2022-12-22T01:08:45ZengSpringerOpenJournal of High Energy Physics1029-84792019-10-0120191017110.1007/JHEP10(2019)182Shapes of gravity: tensor non-Gaussianity and massive spin-2 fieldsGarrett Goon0Kurt Hinterbichler1Austin Joyce2Mark Trodden3Institute for Theoretical Physics and Center for Extreme Matter and Emergent Phenomena, Utrecht UniversityCERCA, Department of Physics, Case Western Reserve UniversityCenter for Theoretical Physics, Department of Physics, Columbia UniversityDepartment of Physics and Astronomy, Center for Particle Cosmology, University of PennsylvaniaAbstract If the graviton is the only high spin particle present during inflation, then the form of the observable tensor three-point function is fixed by de Sitter symmetry at leading order in slow-roll, regardless of the theory, to be a linear combination of two possible shapes. This is because there are only a fixed number of possible on-shell cubic structures through which the graviton can self-interact. If additional massive spin-2 degrees of freedom are present, more cubic interaction structures are possible, including those containing interactions between the new fields and the graviton, and self-interactions of the new fields. We study, in a model-independent way, how these interactions can lead to new shapes for the tensor bispectrum. In general, these shapes cannot be computed analytically, but for the case where the only new field is a partially massless spin-2 field we give simple expressions. It is possible for the contribution from additional spin-2 fields to be larger than the intrinsic Einstein gravity bispectrum and provides a mechanism for enhancing the size of the graviton bispectrum relative to the graviton power spectrum.http://link.springer.com/article/10.1007/JHEP10(2019)182Classical Theories of GravityConformal Field TheoryEffective Field TheoriesScattering Amplitudes |
| spellingShingle | Garrett Goon Kurt Hinterbichler Austin Joyce Mark Trodden Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields Journal of High Energy Physics Classical Theories of Gravity Conformal Field Theory Effective Field Theories Scattering Amplitudes |
| title | Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields |
| title_full | Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields |
| title_fullStr | Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields |
| title_full_unstemmed | Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields |
| title_short | Shapes of gravity: tensor non-Gaussianity and massive spin-2 fields |
| title_sort | shapes of gravity tensor non gaussianity and massive spin 2 fields |
| topic | Classical Theories of Gravity Conformal Field Theory Effective Field Theories Scattering Amplitudes |
| url | http://link.springer.com/article/10.1007/JHEP10(2019)182 |
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