Dark Matter Generation and Split Supersymmetry

We analyze a simple Split Supersymmetry scenario where fermion masses come from anomaly mediation, yielding ms ∼ 1000 TeV, m3/2 ∼ 100 TeV, and mf ∼ 1 TeV. We find that the decay chain of moduli fields → gravitinos → LSPs generates dark matter more efficiently than perturbative freeze-out, allowing for a light, LHC visible spectrum. These decaying moduli can also weaken cosmological constraints on the axion decay constant. With squark masses of order 1000 TeV, LHC gluinos will decay millimeters from their primary vertices, resulting in a striking experimental signature, and the suppression of Flavor Changing Neutral Currents is almost sufficient to allow arbitrary mixing in squark mass matrices.