The Fluxed MSSM

TL;DR

This paper proposes that flux backgrounds in Type IIB string theory with D7-branes yield a simple, predictive pattern of MSSM soft SUSY-breaking terms controlled by two flux-derived parameters, M and μ. The mechanism relies on ISD 3-form fluxes generating a modulus-dominant breaking, leading to a positive-definite scalar potential and a natural solution to the μ-problem, while enforcing flavor universality and suppressing SUSY-CP phases. The flux-induced soft terms are universal and can be captured by a minimal two-parameter description, with potential realizations in D7-brane geometries and no-scale-like structures. An addendum generalizes the framework to intersecting D7-branes, showing how the soft terms acquire ξ_i-dependent modifications, yet retain a calculable, largely universal structure in many semi-realistic setups. Overall, the work connects string flux dynamics to MSSM phenomenology, guiding explicit model-building in F-theory/orientifold contexts.

Abstract

Recent developemnts in string compactifications in the presence of antisymmetric field backgrounds suggest a new simple and predictive structure for soft terms in the MSSM depending only on two parameters. They give rise to a positive definite scalar potential, a solution to the $μ$-problem, flavor universality and absence of a SUSY-CP problem.