Elusive Worldsheet Instantons in Heterotic String Compactifications

Details Elusive Worldsheet Instantons in Heterotic String Compactifications Elusive Worldsheet Instantons in Heterotic String Compactifications

2011-06-15

arxiv.org/abs/1106.2998v1

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, LaTeX

Scientific paper

We compute the spectrum of massless gauge singlets in some heterotic string compactifications using Landau-Ginzburg, orbifold and non-linear sigma-model methods. This probes the worldsheet instanton corrections to the quadratic terms in the spacetime superpotential. Previous results predict that some of these states remain massless when instanton effects are included. We find vanishing masses in many cases not covered by these predictions. However, we discover that in the case of the Z-manifold the corrections do not vanish. Despite this, in all the examples studied, we find that the massless spectrum in the orbifold limit agrees with the nonlinear sigma-model computation.

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