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Updated: Apr 13, 2026

Setting Limits on Supersymmetry Using Simplified Models
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Smooth String Vacua in a Gravitationally Nonperturbative Regime.

Mirjam Cvetič1,2,3, Max Wiesner4

  • 1University of Pennsylvania, Department of Physics and Astronomy, Philadelphia, Pennsylvania 19104, USA.

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|April 11, 2026
PubMed
Summary

We analyzed strong coupling in string theory using domain walls. This resolved a singularity, creating a Randall-Sundrum model variant with a supersymmetric anti-de Sitter vacuum.

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Area of Science:

  • String Theory
  • Quantum Field Theory
  • High Energy Physics

Background:

  • The strong coupling regime of four-dimensional N=2 supersymmetric vacua in heterotic string theory presents theoretical challenges.
  • Understanding these regimes is crucial for unifying gravity and quantum mechanics.

Purpose of the Study:

  • To analyze the strong coupling regime of four-dimensional N=2 supersymmetric vacua of the heterotic string.
  • To resolve the strong coupling singularity of the hidden Hořava-Witten 9-brane.

Main Methods:

  • Utilized a dual domain wall perspective.
  • Employed modular invariance to compute nonperturbative corrections to supersymmetric domain wall equations.

Main Results:

  • Derived a closed-form expression for nonperturbative corrections.
  • Enabled quantitative studies of gravitational strong coupling regimes.
  • Resolved the strong coupling singularity for the hidden Hořava-Witten 9-brane.

Conclusions:

  • The domain wall successfully interpolates between the visible 9-brane and a supersymmetric anti-de Sitter vacuum.
  • This work realizes a variant of the Randall-Sundrum model within string theory.