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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.
Physical Review Letters
|April 11, 2026
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.
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.
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