Quantum corrections in two-dimensional nonsupersymmetric heterotic strings Original Research Article

We study quantum corrections for a family of 24 nonsupersymmetric heterotic strings in two dimensions. We compute their genus-two cosmological constant using the hyperelliptic formalism and the genus-one two-point functions for the massless states. From here we get the mass corrections to the states in the massless sector and discuss the role of the infrared divergences that appear in the computation. We also study some tree level aspects of these theories and find that they are classified not only by the corresponding Niemeier lattice but also by their hidden right-moving gauge symmetry.