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Angelantonj, Carlo(Dipartimento di Fisica, Università di Torino, INFN Sezione di Torino, Via P. Giuria 1, Torino, 10125, Italy); Florakis, Ioannis(Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, München, 80805, Germany); Tsulaia, Mirian(Faculty of Education Science Technology and Mathematics, University of Canberra, Bruce, ACT 2617, Australia) (2014)
Publisher: Elsevier
Types: Article
Subjects: Physics, High Energy Physics - Theory, QC1-999, Nuclear and High Energy Physics

Classified by OpenAIRE into

arxiv: High Energy Physics::Theory, High Energy Physics::Phenomenology
We compute one-loop threshold corrections to non-abelian gauge couplings in four-dimensional heterotic vacua with spontaneously broken $\cal N = 2 \to \cal N = 0$ 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.

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  • ARC | Canonical quantisation for ...
  • EC | SUPERFIELDS

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