Quantum Field Theory
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Quantum field theory (QFT) is a theoretical framework for constructing quantum mechanics|quantum mechanical models of field (physics)|fields and Many-body problem|many-body systems (in a Condensed matter physics|condensed matter context), both of which are systems classically represented by an infinite number of degrees of freedom (physics and chemistry)|degrees of freedom. They are also used in the description of critical phenomena and quantum phase transitions, such as in the BCS theory of superconductivity. Quantum field theories are especially useful for describing systems where the particle count/number may change over the course of a reaction.Most theories in modern particle physics are formulated as Special relativity|relativistic quantum field theories, such as quantum electrodynamics (QED), quantum chromodynamics (QCD), and the Standard Model. The quantum field-theoretic description of the electromagnetic field, quantum electrodynamics, approximately reproduces James Clerk...
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