Dark Matter

Despite the new results on the estimate of cosmological parameters, the need for dark matter, both baryonic and non baryonic, galactic and intergalactic, is still with us. For baryonic dark matter the remaining possibilities are mostly either intergalactic hot gas or galactic MACHOS (Massive Halo Objects like stellar remnants). For non baryonic dark matter the most likely candidates are the so-called WIMPS, the prototype of which could be the lightest supersymmetric particle. These particles are actively searched for at accelerators, and in our neighbourhood either through direct detection or through their annihilation.