Sparticle Spectrum of Large Volume Compactification

TL;DR

This paper investigates the effects of loop-induced moduli mixing on the supersymmetry breaking soft terms in large volume compactifications of Type IIB string theory, highlighting the conditions for stability and the hierarchy of soft masses.

Contribution

It introduces the importance of loop-induced moduli mixing in determining soft terms and shows how it affects scalar masses and gaugino masses in large volume scenarios.

Findings

Soft scalar masses receive D-term contributions proportional to the gravitino mass.

Gaugino masses and A-parameters are suppressed by a loop factor relative to the gravitino mass.

Large moduli mixing can destabilize the large volume solution by creating saddle points.

Abstract

We examine the large volume compactification of Type IIB string theory or its F theory limit and the associated supersymmetry breakdown and soft terms. It is crucial to incorporate the loop-induced moduli mixing, originating from radiative corrections to the Kahler potential. We show that in the presence of moduli mixing, soft scalar masses generically receive a D-term contribution of the order of the gravitino mass m_{3/2} when the visible sector cycle is stabilized by the D-term potential of an anomalous U(1) gauge symmetry, while the moduli-mediated gaugino masses and A-parameters tend to be of the order of m_{3/2}/8pi^2. It is noticed also that a too large moduli mixing can destabilize the large volume solution by making it a saddle point.