Partition Function and Spectrum

  • Kang-Sin Choi
  • Jihn E. Kim
Part of the Lecture Notes in Physics book series (LNP, volume 696)


We have seen in Subsect. 5.3.4 that the only modular invariant lattices in sixteen dimensions are those of E8×E8 and SO(32), while the ten dimensional spacetime part is independently modular invariant. But if we relax this condition such that it is modular invariant in the entire 26 dimensions, we have a more general theory. One fruitful result was the discovery of SO(16)×SO(16) heterotic string without supersymmetry [1], but its applicability is much more profound. This leads to a huge class of orbifold models which we discuss in this book. Furthermore, taking into account the right movers also, we can have a more general modular invariance, leading to the asymmetric orbifold.


Partition Function Conjugacy Class Wilson Line Theta Function Shift Vector 
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Copyright information

© Springer 2006

Authors and Affiliations

  • Kang-Sin Choi
    • 1
  • Jihn E. Kim
    • 1
  1. 1.School of PhysicsSeoul National UniversitySeoulKorea

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