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| Author(s): |
Gabriel Massoni Salla
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física (IF/SBI) |
| Defense date: | 2025-08-08 |
| Examining board members: |
Enrico Bertuzzo;
Oscar Jose Pinto Eboli;
Clarissa Martins Siqueira;
Marco Taoso;
Andrea Tesi
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| Advisor: | Enrico Bertuzzo |
| Abstract | |
In this thesis we analyse several aspects of Dark Sectors, a class of beyond the Standard Model models containing new light and weakly coupled particles. The main goal is to revisit the usual formulation of these Dark Sectors, while simultaneously expanding the discussion by including non-minimal, but simple extra ingredients. In particular, we are interested in not only providing robust theoretical motivations for such modifications, but also in their phenomenological footprints and how they compare with previous studies. In the first part of this thesis, we study the physics of dark photon models. We consider two different scenarios: one in which additional heavy new degrees of freedom generate effective operators involving the dark photon at low energies, and the other where we explicitly include a mass generation mechanism for the dark photon via a dark Higgs. In both cases, at the phenomenological level, we observe large modifications when compared to the minimal dark photon model. In the second part, we analyse axion-like particle models. We introduce leptophilic type of axion-like particles, called majorons, and derive new constraints to its parameter space coming from the ArgoNeuT experiment. Afterwards we build the corresponding baryophilic model, introducing the bajoron, studying the phenomenology and cosmology of the model. In the last part of the thesis, we consider gravitational effects, namely cosmological gravitational particle production and primordial black holes, that are very relevant to the physics of Dark Sectors, in particular when the dark particles are taken as dark matter. We review each of these phenomena and study then their interplay. (AU) | |
| FAPESP's process: | 20/14713-2 - Aspects of the neutrino-dark matter connection |
| Grantee: | Gabriel Massoni Salla |
| Support Opportunities: | Scholarships in Brazil - Doctorate |