EntityQ5357201· pop 5· linked from 19 articlesmass gapSign in to saveenergy difference between ground state and lightest excited state(s)ConnectionspropagatorEntityquantum mechanicsEntitygeneral relativityEntityspecial relativityEntityelectromagnetismEntityWayback MachineEntitydigital object identifierEntitystrong interactionEntityweak interactionEntityStandard ModelEntitystring theoryEntityquantum field theoryEntitybibcodeEntityfieldEntityQ118398Entityquantum electrodynamicsEntityquantum chromodynamicsEntityquantum gravityEntitysupersymmetryEntitytheory of everythingEntityCategoriesQuantum field theory