. "105747321"@en-us . . . "0"^^ . "the branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states"@en-us . "0"^^ . "06112223-n"^^ . . . . . "quantum field theory"^^ . . "106112223"^^ . "quantum field theory"@en-us . .