As a relic of the Big Bang the Universe is full of neutrinos. The relic neutrinos are dark matter , and if neutrinos are massive enough, they may form part or all of the missing matter. The properties of neutrinos of cosmological interest are studied in the division, particularly the possibilities to observe radiatively decaying relic neutrinos. The neutrino group is intensively involved in building models for neutrino properties . As neutrinos are massless in the minimal standard model, one is necessarily led to new physics.
Massive neutrinos can experience interesting quantum mechanical phenomena.
If neutrinos mix, they can oscillate between different neutrino flavors. The neutrino group tries to model the oscillation phenomena using appropriate formalisms that provide more physical insight. The acticity in the World Wide Web focuses on developing The Ultimate Neutrino Page . It is a collection of neutrino data and programs that can be run through the Web by anyone who has access to Internet. The programs include a Java applet Mass Toy which takes a neutrino mass matrix as input, and calculates the consequences on several astrophysical phenomena, and predits the results of neutrino experiments.