grand unified theory

noun

1. GUT. physics any of a number of theories of elementary particles and fundamental interactions designed to explain the gravitational, electromagnetic, strong, and weak interactions in terms of a single mathematical formalism

grand unified theory

1. A theory of elementary forces that unites the weak, strong, electromagnetic, and gravitational interactions into one field theory and views the known interactions as low-energy manifestations of a single unified interaction.

Grand Unified Theory

1. A theory that describes the behavior of matter at temperatures that existed only in the first fraction of a second after the Big Bang. In these theories, the strong, weak, and electromagnetic forces are unified. The greatest triumph of GUTs is that they explain the absence of antimatter in the universe. (See also unified field theory.)