Soft Supersymmetry Breaking in KKLT Flux Compactification

TL;DR

This paper analyzes the structure of soft supersymmetry breaking terms in KKLT flux compactification models, highlighting the interplay of anomaly and modulus mediation and their implications for sparticle spectra and CP violation.

Contribution

It provides a detailed study of soft SUSY breaking in KKLT models, emphasizing the combined effects of anomaly and modulus mediation and their phenomenological consequences.

Findings

Anomaly mediation significantly influences soft terms.

Modulus and anomaly mediation can be comparable in strength.

The axion component cancels CP-violating phases.

Abstract

We examine the structure of soft supersymmetry breaking terms in KKLT models of flux compactification with low energy supersymmetry. Moduli are stabilized by fluxes and nonperturbative dynamics while a de Sitter vacuum is obtained by adding supersymmetry breaking anti-branes. We discuss the characteristic pattern of mass scales in such a set-up as well as some features of 4D N=1 supergravity breakdown by anti-branes. Anomaly mediation is found to always give an important contribution and one can easily arrange for flavor-independent soft terms. In its most attractive realization, the modulus mediation is comparable to the anomaly mediation, yielding a quite distinctive sparticle spectrum. In addition, the axion component of the modulus/dilaton superfield dynamically cancels the relative CP phase between the contributions of anomaly and modulus mediation, thereby avoiding dangerous SUSY CP violation.