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Classification of Exceptional EFTs

Westerdijk, Tom (2019) Classification of Exceptional EFTs. Bachelor's Thesis, Physics.


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The subjects of non-linear symmetries with corresponding Goldstone modes and effective field theories (EFTs) are introduced in this paper. Here, special attention is given to EFTs with enhanced soft limits and its subclass, exceptional EFTs. Furthermore, a systematic approach for finding a consistent set of non-linear symmetries is discussed leading to specific tree structures of Goldstone fields. The method is applied to the cases of a single scalar and a single vector Goldstone. This results in a full classification of theories where for the scalar the only exceptional EFTs correspond to the scalar Dirac-Born-Infeld theory and the special Galileon. The only vector-algebra that gives rise to a consistent theory is found to be that of a massive vector coupled to a special Galileon. The specific interaction terms are investigated and show strong correspondence to findings from other authors.

Item Type: Thesis (Bachelor's Thesis)
Supervisor nameSupervisor E mail
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 04 Jul 2019
Last Modified: 09 Jul 2019 09:29

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