### 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 |
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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 |

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### 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

}

*Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 736, pp. 365-370. https://doi.org/10.1016/j.physletb.2014.08.001

**Universality of gauge thresholds in non-supersymmetric heterotic vacua.** / Angelantonj, Carlo; Florakis, Ioannis; TSULAIA, Mirian.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Universality of gauge thresholds in non-supersymmetric heterotic vacua

AU - Angelantonj, Carlo

AU - Florakis, Ioannis

AU - TSULAIA, Mirian

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - String-theory

KW - supersymmetry

KW - string-compactifications

UR - http://www.scopus.com/inward/record.url?scp=84907332871&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/universality-gauge-thresholds-nonsupersymmetric-heterotic-vacua

U2 - 10.1016/j.physletb.2014.08.001

DO - 10.1016/j.physletb.2014.08.001

M3 - Article

VL - 736

SP - 365

EP - 370

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

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

SN - 0370-2693

ER -