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Bansal, Sukruti (2019) Goldstone Fields with Spins Higher than 1/2. [Ph.D. thesis]

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Abstract (italian or english)

We study three-dimensional non-linear models of vector and vector-spinor Goldstone fields associated with the spontaneous breaking of certain higher-spin counterparts of supersymmetry. The Lagrangians in these models are of a Volkov-Akulov type. Goldstone fields in these models transform non-linearly under the spontaneously broken rigid symmetries. We find that the leading term in the action of the vector Goldstone model is the Abelian Chern-Simons action whose gauge symmetry is broken by a quartic term. As a result, the model has a propagating degree of freedom which, in a decoupling limit, is a quartic Galileon scalar field. The vector-spinor goldstino model turns out to be a non-linear generalization of the three-dimensional Rarita-Schwinger action. In contrast to the vector Goldstone case, this non-linear model retains the gauge symmetry of the free Rarita-Schwinger action and eventually reduces to the latter by a non-linear field redefinition. We thus find that the free Rarita-Schwinger action is invariant under a hidden rigid supersymmetry generated by fermionic vector-spinor operators and acting non-linearly on the Rarita-Schwinger goldstino.

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EPrint type:Ph.D. thesis
Tutor:Sorokin, Dmitri
Ph.D. course:Ciclo 31 > Corsi 31 > FISICA
Data di deposito della tesi:29 May 2019
Anno di Pubblicazione:29 March 2019
Key Words:higher-spin fields, supersymmetry, spontaneous symmetry breaking, Goldstone fields, Galileons, Rarita-Schwinger field
Settori scientifico-disciplinari MIUR:Area 02 - Scienze fisiche > FIS/02 Fisica teorica, modelli e metodi matematici
Struttura di riferimento:Dipartimenti > Dipartimento di Fisica e Astronomia "Galileo Galilei"
Codice ID:11958
Depositato il:11 Jun 2019 16:12
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