### Abstract

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.

Original language | English |
---|---|

Pages (from-to) | 365-370 |

Number of pages | 6 |

Journal | Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 736 |

DOIs | |

Publication status | Published - 2014 |

### Fingerprint

### Cite this

*Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*736*, 365-370. https://doi.org/10.1016/j.physletb.2014.08.001