Conformal Gauge Mediation and Light Gravitino of Mass m_{3/2} <O(10) eV

TL;DR

This paper explores conformal gauge mediation models predicting a very light gravitino under 10 eV, which is cosmologically advantageous, and determines the supersymmetric particle spectrum based on the messenger mass.

Contribution

It introduces a class of conformal gauge mediation models with a unique spectrum determined by the messenger mass, predicting a light gravitino in the strongly interacting conformal fixed point regime.

Findings

Predicts a gravitino mass less than 10 eV.

Spectrum of supersymmetric particles is uniquely determined by messenger mass.

Light gravitino alleviates cosmological issues.

Abstract

We discuss a class of gauge mediated supersymmetry breaking models with conformal invariance above the messenger mass scale (conformal gauge mediation). The spectrum of the supersymmetric particles including the gravitino is uniquely determined by the messenger mass. When the conformal fixed point is strongly interacting, it predicts a light gravitino of mass m_{3/2}<O(10) eV, which is attractive since such a light gravitino causes no problem in cosmology.