Westerdijk, Tom (2021) Non-linear Symmetries in Inflation. Master's Thesis / Essay, Physics.
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Abstract
Inflation is the most successful theory in explaining the isotropy and flatness of the universe. The quantum mechanical perturbations dur- ing inflation are responsible for the inhomogeneities in our cosmos. There exist, however, many models of inflation. In an attempt of nav- igating in this abundance of possible theories, we study the non-linear symmetries of the quantum perturbations. After an introduction to the classical and quantum mechanical theory of inflation, we give a general background on the subjects of broken (gauge) symmetries, ef- fective field theory, large gauge symmetries and soft theorems. Subse- quently, we investigate the construction of a EFT of inflation based on broken time diffeomorphisms. Then, we will derive a set of consistency relations as a consequence of large gauge symmetries in cosmology. We pay special attention to the derivation of consistency relations in non- attractor models of inflation with the enhancement of a inflaton shift symmetry.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Roest, D. and Meerburg, P.D. |
| Degree programme: | Physics |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 09 Jul 2021 14:01 |
| Last Modified: | 09 Jul 2021 14:01 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/25126 |
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