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Full realization of non–gravity-mediated supersymmetry breaking in string theory

Construct fully realized string-theoretic models that implement non–gravity-mediated supersymmetry breaking—specifically one-loop anomaly mediation with sequestered visible sectors and gauge mediation with localized visible sectors and fully stabilized bulk moduli—demonstrating consistent transmission of supersymmetry breaking to the MSSM without reliance on gravity mediation.

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Background

Most semi-realistic string constructions implement gravity-mediated supersymmetry breaking via moduli stabilization mechanisms (e.g., gaugino condensation in heterotic strings or flux plus non-perturbative effects in Type IIB).

Alternatives such as anomaly mediation require sequestering (often via warped throats) and gauge mediation requires localizing the SM sector and stabilizing bulk moduli at high scale; achieving these conditions coherently within explicit string compactifications has proven challenging and remains unresolved.

References

Alternatives to gravity mediated supersymmetry breaking have also been explored in string theory setups, but their full realization remains an open problem.

— The Standard Model from String Theory: What Have We Learned? (2401.01939 - Marchesano et al., 3 Jan 2024) in Section 3.3 (MSSM and Supersymmetry Breaking)