Mass gap

A quantum field theory model is said to have a mass gap if the energy spectrum not including zero has a positive greatest lower bound.

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Quantum field theory: Quantum field theory (QFT) is the application of quantum mechanics to fields. It provides a theoretical framework, widely used in particle physics and condensed matter physics, in which to formulate consistent quantum theories of many-particle systems, especially in situations where particles may be...

Greatest lower bound: REDIRECT Infimum...

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