Variations of the Hidden Sector in a Realistic Intersecting Brane Model
Abstract
Recently, we discussed the first example of a phenomenologically realistic intersecting D6-brane model. In this model, the gauge symmetry in the hidden sector is USp(2)_1 x USp(2)_2 x USp(2)_3 x USp(2)_4. However, we find that the USp(2)_1 x USp(2)_2 gauge symmetry can be replaced by an U(2)_{12} gauge symmetry, and/or the USp(2)_3 x USp(2)_4 gauge symmetry can be replaced by an U(2)_{34} gauge symmetry since the USp(2)^2 stacks of D6-branes contribute to the same Ramond-Ramond tadpoles as those of the U(2) stacks. Thus, there are three non-equivalent variations of the hidden sector, and the corresponding gauge symmetries are U(2)_{12} x USp(2)_3 x USp(2)_4, U(2)_{34} x USp(2)_1 x USp(2)_2, and U(2)_{12} x U(2)_{34}, respectively. Moreover, we study the hidden sector gauge symmetry breaking, discuss how to decouple the additional exotic particles, and briefly comment on the phenomenological consequences.
Keywords
Cite
@article{arxiv.0704.1855,
title = {Variations of the Hidden Sector in a Realistic Intersecting Brane Model},
author = {Ching-Ming Chen and Tianjun Li and V. E. Mayes and Dimitri V. Nanopoulos},
journal= {arXiv preprint arXiv:0704.1855},
year = {2008}
}
Comments
RevTex4, 15 pages, 10 tables