TNT Colloquium: A Modern Perspective on Nambu-Goldstone Bosons [Duke]

The Nambu-Goldstone boson (NGB) is a massless degree of freedom associated with spontaneous symmetry breaking, which is ubiquitous in Nature and underlies a wide variety of physical phenomena. Conventional wisdom has it that interactions of NGB depend on the pattern of symmetry breaking, which involves ultraviolet knowledge of the system. In this talk I will describe a new approach to understanding NGBs using only the infrared data, which results in a new way to construct consistent effective field theories of Nambu-Goldstone bosons.