The research activities of PhD students take place within the Physics Department of the Pisa University or in other Universities and Research Centers, and can be classified into 5 main scientific areas, which are described below. A brief description of such activities is contained in the web pages of the Physics Department and of the Pontecorvo Area. A more detailed view of the research subjects can be obtained from the list of recent PhD Theses, which can be found in the Students section of this website.