This category contains all projects that deals with the interactions between long-lived particles such as protons, electrons, etc., short-lived particles (mesons, leptons, quanta, etc.) and that deale with many natural constants in "usual" space. Another research topic is the elemental forces that emanate from these particles, ie. nuclear and gravitational forces and electromagnetic forces.
Elementary physics is based on the hitherto known physical laws. In turn, on their conclusions are based on physics and astronomy. It is only because of the highly complex interaction of all these elements and forces that our universe exists.