Holography applications in the strongly coupled sector: from QCD to the new physics
[eng] AdS/CFT correspondence combines ideas of holography and duality in a way that allows one to make calculations in the otherwise hardly accessible (strongly coupled) regime of the target theory. In this thesis we are interested in describing strongly coupled sectors in the Standard Model and bey...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/177913 |
| Acceso en línea: | https://hdl.handle.net/2445/177913 http://hdl.handle.net/10803/671798 |
| Access Level: | acceso abierto |
| Palabra clave: | Teoria quàntica de camps Partícules (Matèria) Hadrons Bosons de Higgs Quantum field theory Particles Higgs bosons |
| Sumario: | [eng] AdS/CFT correspondence combines ideas of holography and duality in a way that allows one to make calculations in the otherwise hardly accessible (strongly coupled) regime of the target theory. In this thesis we are interested in describing strongly coupled sectors in the Standard Model and beyond within the holographic framework. In particular, we use the bottom-up holographic approach in application to the phenomenology of QCD and Composite Higgs. In the latter a new strong interaction binds hyper-fermions into composite states at TeV energies, and the Higgs is one of the pseudo-Goldstone bosons appearing as a result of new flavor symmetry breaking. In the bottom-up model building the conformal invariance of the AdS space must be broken by the manual introduction of the wall in the extra dimension. We favor the soft wall models, because they reproduce linear radial Regge-like spectra of the states. In application to QCD, we provide results on the determination of the QCD deconfinement temperature in the bottom-up models of different types, and the study of the low-energy QCD physics triggered by a novel implementation of the chiral symmetry breaking in the soft wall model. The phenomenological outcome of the latter model is given in terms of the fit to fifteen QCD observables with the RMS error of 30%. Concerning the New Physics, we specialize on the minimal Composite Higgs case. We calculate masses of the new composite resonances, estimate several couplings between the new sector states and the electro-weak bosons and analyse the holographic realization of the first and second Weinberg sum rules. Experimental limitations on the electro-weak precision observables and the misalignment angle, as well as the known value of the elctro-weak scale, constrain the parameter space of the holographic model and specify the scale of its predictions. We conclude that the model is able to accommodate new vector resonances with masses in the range 2 TeV to 3 TeV without encountering phenomenological difficulties. |
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