Absolute neutrino mass determination - art. no. 113015

We discuss four approaches to the determination of absolute neutrino mass. These are the measurement of the zero-neutrino double beta decay rate, of t he tritium decay end-point spectrum, of the cosmic ray spectrum above the G ZK cutoff (in the Z-burst model), and the cosmological measurement of the p ower spectrum governing the CMB and large scale structure. The first two ap proaches are sensitive to the mass eigenstates coupling to the electron neu trino, whereas the latter two are sensitive to the heavy component of the c osmic neutrino background. All mass eigenstates are related by the deltam(2 )'s inferred from neutrino oscillation data. Consequently, the potential fo r the absolute mass determination of each of the four approaches is correla ted with the other three, in ways that we point out.