Faraggi, Alon E 
ORCID: 0000-0001-7123-6414, Harries, Glyn, Percival, Benjamin and Rizos, John
(2020)
Doublet-triplet splitting in fertile left-right symmetric heterotic string vacua.
NUCLEAR PHYSICS B, 953.
114969-.
Abstract
Classification of Left-Right Symmetric (LRS) heterotic-string vacua in the free fermionic formulation, using random generation of generalised GSO (GGSO) projection coefficients, produced phenomenologically viable models with probability $4\times 10^{-11}$. Extracting substantial number of phenomenologically viable models requires modification of the classification method. This is achieved by identifying phenomenologically amenable conditions on the Generalised GSO projection coefficients that are randomly generated at the $SO(10)$ level. Around each of these fertile cores we perform a complete LRS classification, generating viable models with probabilility $1.4\times 10^{-2}$, hence increasing the probability of generating phenomenologically viable models by nine orders of magnitude, and producing some $1.4\times 10^5$ such models. In the process we identify a doublet-triplet selection mechanism that operates in twisted sectors of the string models that break the $SO(10)$ symmetry to the Pati-Salam subgroup. This mechanism therefore operates as well in free fermionic models with Pati-Salam and Standard-like Model $SO(10)$ subgroups.
| Item Type: | Article |
|---|---|
| Additional Information: | 30 pages. 1 figure. Published version |
| Uncontrolled Keywords: | hep-th, hep-th, hep-ph |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Dec 2019 08:44 |
| Last Modified: | 19 Jan 2023 00:12 |
| DOI: | 10.1016/j.nuclphysb.2020.114969 |
| Open Access URL: | https://doi.org/10.1016/j.nuclphysb.2020.114969 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3066396 |
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