Searches for sterile neutrinos (and other light particles)

Abstract

Future neutrino and cosmological experiments will perform powerful searches for new light particles. After a general introduction we discuss how a new light fermion (`sterile neutrino') could manifest.Comment: 8 pages, 5 figures. Talk at Neutrino 2004, with some original content (e.g. the up-to-date global fit of solar and KamLAND data