Non supersymmetric unified models from String Theory

Abstract

The subject of this doctoral dissertation is the construction and phenomenological analysis of four-dimensional non supersymmetric unified models in the framework of heterotic string theory. These models are analysed using a dual approach, in which we employ both the free fermionic formulation as well as the equivalent description in terms of orbifold compactifications in order to identify models whose low energy phenomenology is consistent with a set of constraints. These include the absence of physical tachyons, as well as the presence of chiral matter and scalar Higgs bosons needed to induce the required gauge symmetry breaking. In this context, supersymmetry is spontaneously broken via a stringy realisation of the Scherk-Schwarz mechanism, implemented as a freely-acting Z2 orbifold which includes an order-two shift along a compact dimension coupled to the spacetime fermion parity. When supplemented with sufficient super no-scale conditions, these models may exhibit a low scale of s ...
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DOI
10.12681/eadd/53287
Handle URL
http://hdl.handle.net/10442/hedi/53287
ND
53287
Alternative title
Μη υπερσυμμετρικά ενοποιημένα πρότυπα από τη Θεωρία Χορδών
Author
Violaris-Gkountonis, Konstantinos (Father's name: Nikolaos)
Date
2023
Degree Grantor
University of Ioannina
Committee members
Ρίζος Ιωάννης
Ταμβάκης Κυριάκος
Κεχαγιάς Αλέξανδρος
Καντή Παναγιώτα
Δέδες Αθανάσιος
Φλωράκης Ιωάννης
Σφέτσος Κωνσταντίνος
Discipline
Natural SciencesPhysical Sciences ➨ Particles and fields physics
Natural SciencesPhysical Sciences ➨ Physics, miscellaneous
Keywords
String theory; Heterotic string; Non supersymmetric strings
Country
Greece
Language
English
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