We compute one-loop threshold corrections to non-abelian gauge couplings in four-dimensional heterotic vacua with spontaneously broken N=2→N=0 supersymmetry, obtained as Scherk-Schwarz reductions of six-dimensional K3 compactifications. As expected, the gauge thresholds are no-longer BPS protected, and receive contributions also from the excitations of the RNS sector. Remarkably, the difference of thresholds for non-abelian gauge couplings is BPS saturated and exhibits a universal behaviour independently of the orbifold realisation of K3. Moreover, the thresholds and their difference develop infra-red logarithmic singularities whenever charged BPS-like states, originating from the twisted RNS sector, become massless at special loci in the classical moduli space. © 2014 The Authors.
CITATION STYLE
Angelantonj, C., Florakis, I., & Tsulaia, M. (2014). Universality of gauge thresholds in non-supersymmetric heterotic vacua. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 736, 365–370. https://doi.org/10.1016/j.physletb.2014.08.001
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