Berzan, Nichita (2025) A Celestial Basis for Gravity and Effective Field Theories. Master's Thesis / Essay, Physics.
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Abstract
A principal objective of modern high-energy physics is understanding holographic dualities beyond asymptotically Anti-de Sitter spacetimes. We investigate a framework that aims to extend the notion of holography to spacetimes that are asymptotically flat, where 4D bulk scattering amplitudes are related to 2D correlators on the celestial sphere. This relies on the connection between asymptotic symmetries, soft theorems, and memory effects which reveal a universal structure of infrared physics. In this study, we investigate whether we can translate scalar effective field theories, such as the one describing pion scattering, to the celestial basis in order to tackle the same questions in a simplified arena. This relies on a novel basis change where the Mellin integral is defined on a closed contour over energies. Ultimately, we apply the second basis change to a class of effective theories without success, concluding that the failure stems from not guaranteeing that solutions to the Klein Gordon equation remain so after the basis change.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Roest, D. |
| Degree programme: | Physics |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 18 Nov 2025 13:22 |
| Last Modified: | 18 Nov 2025 13:22 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/37137 |
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