Transitions of orbifold vacua

  title={Transitions of orbifold vacua},
  author={Kang-Sin Choi and Tatsuo C. Kobayashi},
  journal={Journal of High Energy Physics},
A bstractWe study the global structure of vacua of heterotic strings compactified on orbifolds T4/ℤN (N = 2, 3) in the presence of heterotic 5-branes. Gauge symmetry breaking associated with orbifold is described by instantons in the field theory. There is phase transition between small (zero size limit) instantons and heterotic 5-branes. This mechanism provides top-down, stringy account to the spectrum and modular invariance condition of non-perturbative vacua with 5-branes. Also it takes us… 

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