👉 The term "goldstone" is often used in physics to describe a type of quantum field theory. Goldstones are fundamental particles that are described by a certain set of equations and they play a central role in the study of string theory, which is an extension of general relativity that describes gravity as a four-dimensional theory with extra dimensions. These particles can be thought of as "quantum strings" or "stringy particles," and their existence has been confirmed through experiments and simulations.