Particle physics and cosmology is the research on the fundamental properties of the Universe. These include the elementary constituents of matter, basic interactions amongst them, and the evolution of the Universe. In our group, we investigate questions such as what is Dark Matter in the Universe? What does the law of gravity look like at the length scale as large as the Universe itself? What is the origin of masses of elementary particles? How would different kinds of neutrinos mix? Would string theory be the ultimate Theory of Everything? Would it be possible to precisely calculate the strong interactions amongst quarks and gluons?