Supersymmetric dark matter with a cosmological constant

Abstract

Recent measurements of cosmological parameters from the microwave background radiation, type Ia supernovae, and the age of globular clusters help determine the relic matter density in the universe. It is first shown with mild cosmological assumptions that the relic matter density satisfies ${\Omega }_M{h}^2<0.6$ independent of the cosmological constant and independent of the SNIa data. Including the SNIa data, the constraint becomes ${\Omega }_M{h}^2<0.35$. This result is then applied to supersymmetric models motivated by generic features in supergravity mediated supersymmetry breaking. The result is an upper bound on gaugino masses within reach of the LHC and a 1.5 TeV lepton collider. Thus, cosmological considerations are beginning to limit the supersymmetric mass spectra in the experimentally verifiable range without recourse to finetuning arguments, and without assuming a zero cosmological constant.

8 pages, latex, 2 figures

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• Neutralino and gravitino dark matter with low reheating temperature
• Weighing the universe with accelerators and detectors
• Sgoldstino-less inflation and low energy SUSY breaking
• Partial wave treatment of Supersymmetric Dark Matter in the presence of CP - violation
• Neutralino Relic Density with a Cosmological Constant confronts Electroweak Precision Measurements
• How to Interpret a Tau Excess at LEP2 within the MSSM