Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-11-16
Phys.Lett.B669:352-356,2008
Physics
High Energy Physics
High Energy Physics - Theory
10 pages. Figure and table changed
Scientific paper
10.1016/j.physletb.2008.09.061
We construct spacetime supersymmetric, modular invariant partition functions of strings on the conifold-type singularities which include contributions from the discrete-series representations of SL(2, R). The discrete spectrum is automatically consistent with the GSO projection in the continuous sector, and contains massless matter fields localized on a four-dimensional submanifold at the tip of a cigar. In particular, they are in the 27+1 of E6 for the E8 x E8 heterotic string. We speculate about a possible realization of local E6 GUT by using this framework.
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