Goldstone is a research area in the field of condensed matter physics that focuses on understanding how particles or excitations of a material interact and move within a crystalline lattice structure. The Goldstone mode, named after physicist Jeffrey Goldstone, is a collective excitation of a system that arises spontaneously due to the breaking of a continuous symmetry. This research area explores phenomena such as phase transitions, superconductivity, and magnetic ordering, and seeks to develop a deeper understanding of the fundamental principles underlying these complex behaviors in materials.