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

SN - 0370-2693

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

ER -