Dissertation/ Thesis
Predictions in cosmology and particle physics from effective models of string theory origin ; Προβλέψεις στην κοσμολογία και σωματιδιακή φυσική ενεργών προτύπων από την θεωρία χορδών
| العنوان: | Predictions in cosmology and particle physics from effective models of string theory origin ; Προβλέψεις στην κοσμολογία και σωματιδιακή φυσική ενεργών προτύπων από την θεωρία χορδών |
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| المؤلفون: | Tavellaris, Ilias, Ταβελλάρης, Ηλίας |
| بيانات النشر: | University of Ioannina Πανεπιστήμιο Ιωαννίνων |
| سنة النشر: | 2024 |
| المجموعة: | National Archive of PhD Theses (National Documentation Centre Greece) |
| مصطلحات موضوعية: | Κοσμολογικός πληθωρισμός, Θεωρία-F, Φυσική υψηλών ενεργειών, Φαινομενολογία, Θεωρία χορδών και κοσμολογία, Inflation, F-theory, High energy physics, Phenomenology, String theory and cosmology, Φυσική, Φυσικές Επιστήμες, Σωματιδιακή φυσική και Φυσική πεδίων, άλλοι τομείς, Physical Sciences, Natural Sciences, Particles and fields physics, Physics, miscellaneous |
| الوصف: | This doctoral dissertation explores various aspects of particle physics and cosmology, with an initial focus on supersymmetry, followed by an investigation into F-theory. Initially we begin with a realistic SO(10) supersymmetric model, where fermion families are organized into three 16-plets. This model reproduces the low-energy Standard Model (SM) and successfully implements inflation via a superpotential with a U(1)R symmetry. SO(10) symmetry breaks down to the SM through specific Higgs representations, allowing for fermion mass generation, CKM mixings, and a doublet-triplet splitting mechanism that maintains light Higgs doublets. The model’s inflationary predictions align well with observational data, and during reheating, right-handed neutrinos from inflaton decay yield the observed baryon asymmetry via non-thermal leptogenesis. Moving beyond supersymmetry, in the next step, we analyze the cosmological implications of an effective field theory derived from type-IIB string theory where the Kähler moduli fields are stabilized and a de Sitter vacuum is ensured. Within this framework, we implement the standard hybrid inflation scenario where inflation is driven by a singlet scalar field, while Higgs fields act as waterfall fields. The model's alignment with cosmological data, notably through radiative corrections and soft supersymmetric terms, yields low tensor-to-scalar ratios and small contributions to dark radiation. Leaving inflation behind, we proceed with investigating of F-theory models featuring an extended SU(5) gauge group, augmented by a non-universal U(1)′ symmetry that couples differently to quark and lepton families. The SU(5) group stems from the maximal exceptional E8 gauge symmetry in an elliptically fibred internal space. In this set up, utilizing a Z2 monodromy group, rank-one fermion mass textures and top quark couplings are achieved at tree level, while the U(1)′ integrates smoothly with remaining abelian symmetries without anomalies. We explore model classes defined by distinct U(1)′ ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| Relation: | http://hdl.handle.net/10442/hedi/57676 |
| DOI: | 10.12681/eadd/57676 |
| الاتاحة: | http://hdl.handle.net/10442/hedi/57676 https://doi.org/10.12681/eadd/57676 |
| رقم الانضمام: | edsbas.8F4E42CF |
| قاعدة البيانات: | BASE |
| DOI: | 10.12681/eadd/57676 |
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