Indirect signals from dark matter in split supersymmetry

We study the possibilities for the indirect detection of dark matter in split supersymmetry from $\gamma$ rays, positrons, and antiprotons. The most promising signal is the $\gamma$-ray line, which may be observable at the next generation of detectors. For certain halo profiles and a high mass neutralino, the line can even be visible in current experiments. The continuous $\gamma$-ray signal may be observable, if there is a central spike in the galactic halo density. The signals are found to be similar to those in the minimal supersymmetric standard models. These indirect signals complement other experiments, being most easily observable for regions of parameter space, such as heavy $W$-ino and Higgsino dominated neutralinos, which are least accessible with direct detection and accelerator searches.