Simultaneous Solution to Dark Matter and Flavor Problems of Supersymmetry

Jonathan L Feng,Bryan T Smith,Fumihiro Takayama

doi:10.1103/physrevlett.100.021302

Jonathan L Feng, Bryan T Smith + Show 1 more

Open Access

https://doi.org/10.1103/physrevlett.100.021302

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Abstract

Neutralino dark matter is well motivated, but also suffers from two shortcomings: it requires gravity-mediated supersymmetry breaking, which generically violates flavor constraints, and its thermal relic density Omega is typically too large. We propose a simple solution to both problems: neutralinos freeze-out with Omega approximately 10-100, but then decay to approximately 1 GeV gravitinos, which are simultaneously light enough to satisfy flavor constraints and heavy enough to be all of dark matter. This scenario is naturally realized in high-scale gauge-mediation models, ameliorates small scale structure problems, and implies that "cosmologically excluded" models may, in fact, be cosmologically preferred.

Highlights

10–100, but decay to 1 GeV gravitinos, which are simultaneously light enough to satisfy flavor constraints and heavy enough to be all of dark matter
The thermal relic density of neutralinos is dependent on unknown supersymmetry parameters
DM is the observed energy density of nonbaryonic dark matter in units of the critical density, and h ’ 0:73 is the normalized Hubble parameter. This remarkable fact has motivated supersymmetry, but has focused attention on ‘‘cosmologically preferred’’ models, in which the neutralino thermal relic density is exactly that required for dark matter

Summary

Introduction

Neutralino dark matter is well motivated, and suffers from two shortcomings: it requires gravitymediated supersymmetry breaking, which generically violates flavor constraints, and its thermal relic density is typically too large. 10–100, but decay to 1 GeV gravitinos, which are simultaneously light enough to satisfy flavor constraints and heavy enough to be all of dark matter.

Results

Conclusion