Faraggi, Alon E 
ORCID: 0000-0001-7123-6414, Matyas, Viktor G and Percival, Benjamin
(2021)
Type (0)over-bar heterotic string orbifolds.
PHYSICS LETTERS B, 814.
p. 136080.
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Abstract
The $Z_2\times Z_2$ heterotic string orbifold gives rise to a large space of phenomenological three generation models that serves as a testing ground to explore how the Standard Model of particle physics may be incorporated in a theory of quantum gravity. Recently, we demonstrated the existence of type 0 $Z_2\times Z_2$ heterotic string orbifolds in which there are no massless fermionic states. In this paper we demonstrate the existence of non--supersymmetric tachyon--free $Z_2\times Z_2$ heterotic string orbifolds that do not contain any massless bosonic states from the twisted sectors. We dub these configurations type ${\bar 0}$ models. They necessarily contain untwisted bosonic states, producing the gravitational, gauge and scalar moduli degrees of freedom, but possess an excess of massless fermionic states over bosonic ones, hence producing a positive cosmological constant. Such configurations may be instrumental when trying to understand the string dynamics in the early universe.
| Item Type: | Article |
|---|---|
| Additional Information: | 14 pages. Standard LaTeX. No figures. Published version |
| Uncontrolled Keywords: | hep-th, hep-th, hep-ph |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 30 Nov 2020 09:22 |
| Last Modified: | 18 Jan 2023 23:20 |
| DOI: | 10.1016/j.physletb.2021.136080 |
| Open Access URL: | https://www.sciencedirect.com/science/article/pii/... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3108536 |
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