the system, whereas the relativistic fields described above are a necessary consequence of the consistent union of relativity and quantum mechanics. See also Quantum triviality Composite field Auxiliary field References Peskin, M and Schroeder, D. (1995). An Introduction to Quantum Field Theory, Westview Press. Srednicki, Mark (2007). Quantum Field Theory, Cambridge University Press, . Weinberg, Steven (1995). The Quantum Theory of Fields, (3 volumes) Cambridge University Press. Quantum field theory