Our Universe is made of a dozen fundamental building blocks. Among these, neutrinos are the most mysterious - but they are the second most abundant particles in the Universe. This book provides detailed discussions of how to describe neutrinos, their basic properties, and the roles they play in nature.

This book contains the proceedings of the Fourth Meeting on CPT and Lorentz Symmetry, held at Indiana University in Bloomington on August 8-11, 2007. The Meeting focused on experimental tests of these fundamental symmetries and on important theoretical issues, including scenarios for possible relativity violations.Experimental subjects covered include: astrophysical observations, clock-comparison measurements, cosmological birefringence, electromagnetic resonant cavities, gravitational tests, matter interferometry, muon behavior, neutrino oscillations, oscillations and decays of neutral mesons, particle-antiparticle comparisons, post-Newtonian gravity, space-based missions, spectroscopy of hydrogen and antihydrogen, and spin-polarized matter. Theoretical topics covered include: physical effects at the level of the Standard Model, General Relativity, and beyond; the possible origins and mechanisms for Lorentz and CPT violations; and associated issues in field theory, particle physics, gravity, and string theory. Contributors consist of the leading experts in this very active research field.

The treatment of time in quantum mechanics is still an important and challenging open question in the foundation of the quantum theory. This multi-authored book, written as an introductory guide for newcomers to the subject, as well as a useful source of information for the expert, covers many of the open questions. The book describes the problems, and the attempts and achievements in defining, formalizing and measuring different time quantities in quantum theory.

This conference celebrated the discovery of neutral currents in neutrino interactions twenty years ago. History will mark the 1973 decisive experiments as the turning point of a new era in theoretical and experimental physics. The participants in the discovery retrace its circumstances and genesis, and all the present aspects of its heritage are reviewed: particle physics (the standard model has to date not been invalidated by the most precise experiments at LEP), atomic physics and astrophysics.

Hardbound. In cosmology the neutrinos determine the expansion rate of the early universe. They probably constitute part of hot dark matter and are essential for supernova explosions. In spite of great efforts, the missing solar neutrinos are not completely understood. Various solar neutrino experiments seem to give different results about the missing solar neutrinos. However each of these experiments, such as the C1 detector, GALLEX, SAGE and KAMIOKANDE, measure slightly different quantities. Only GALLEX and SAGE look exactly for the same neutrinos and seem to be in agreement with each other.This volume of review articles looks in depth at the latest research results and presents a state-of-art view of this fast exanding field. All the chapters are written by leading experts active in the field today.