Browsing by Subject "String phenomenology."
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Item Initial systematic investigations of the weakly coupled free fermionic heterotic string landscape statistics.(2011-09-14) Renner, Timothy, 1984-; Cleaver, Gerald B.; Physics.; Baylor University. Dept. of Physics.A C++ framework was constructed with the explicit purpose of systematically generating string models using the Weakly Coupled Free Fermionic Heterotic String (WCFFHS) method. The software, optimized for speed, generality, and ease of use, has been used to conduct preliminary systematic investigations of WCFFHS vacua. Documentation for this framework is provided in the Appendix. After an introduction to theoretical and computational aspects of WCFFHS model build- ing, a study of ten-dimensional WCFFHS models is presented. Degeneracies among equivalent expressions of each of the known models are investigated and classified. A study of more phenomenologically realistic four-dimensional models based on the well known “NAHE” set is then presented, with statistics being reported on gauge content, matter representations, and space-time supersymmetries. The final study is a parallel to the NAHE study in which a variation of the NAHE set is systematically extended and examined statistically. Special attention is paid to models with “mirroring” — identical observable and hidden sector gauge groups and matter representations.Item Investigation of low Higgs models in Weakly Coupled Free Fermionic Heterotic String Theory.(2010-10-08T16:25:07Z) Pechan, Kristen.; Cleaver, Gerald B.; Physics.; Baylor University. Dept. of Physics.Superstring phenomenology explores classes of vacua which can reproduce the Standard Model at low energy. We consider Weakly Coupled Free Fermionic Heterotic String Theory (WCFFHST) which produces four dimensional Standard-like Models and allows for their SO(10) embedding. In the models herein, we explore the removal of extra Higgs representations via free fermion boundary conditions directly at the string level, rather than in the low energy effective field theory. We focus on the flat direction analysis of four models with reduced number of Higgs, after flat direction analysis of a three generation reduced Higgs model revealed no stringent F- and D-flat solutions to all order in the superpotential. Flat direction analysis of the four models presented herein shows the lack of D- and F-flat solutions to all order is not a general property of low Higgs models, as stringent flat directions appear to all order for three of our four models.