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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 created and destroyed. Non-relativistic quantum field theories are needed in condensed matter physics— for example in the BCS theory of superconductivity. Relativistic quantum field theories are indispensable in particle physics (see the standard model), although they are known to arise as effective field theories in condensed matter physics.
Origin
Quantum field theory originated in the problem of computing the energy radiated by an atom when it dropped from one quantum state to another of lower energy. This problem was first examined by Max Born and Pascual Jordan in 1925. In 1926, Max Born, Werner Heisenberg and Pascual Jordan wrote down the quantum theory of the electromagnetic field neglecting polarization and sources to obtain what would today be called a free field theory. In order to quantize this theory, they used the canonical quantization procedure. In 1927, Paul Dirac gave the first consistent treatment of this problem. Quantum field theory followed unavoidably from a quantum treatment of the only known classical field, ie, electromagnetism. The theory was required by the need to treat a situation where the number of particles changes. Here, one atom in the initial state becomes an atom and a photon in the final state.
It was obvious from the beginning that the quantum treatment of the electromagnetic field required a proper treatment of relativity. Jordan and Wolfgang Pauli showed in 1928 that commutators of the field were actually Lorentz invariant. By 1933, Niels Bohr and Leon Rosenfeld had related these commutation relations to a limitation on the ability to measure fields at space-like separation. The development of the Dirac equation and the hole theory drove quantum field theory to explain these using the ideas of causality in relativity, work that was completed by Wendell Furry and Robert Oppenheimer using methods developed for this purpose by Vladimir Fock. This need to put together relativity and quantum mechanics was a second motivation which drove the development of quantum field theory. This thread was crucial to the eventual development of particle physics and the modern (partially) unified theory of forces called the standard model.
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@mrsuniverse try burkhard heim. unified quantum field theory. good to 5 decimals correlation between quantum mechanics and relativity.
kirkland4 (william kirkland) Sat, 07 Nov 2009 02:45:24 -0000
@mrsuniverse try burkhard heim. unified quantum field theory. good to 5 decimals correlation between quantum mechanics and relativity.
Andy Schofield and splitting the electron:http://bit.ly/pGaio. I thought he sounded clever when he tried to teach me Quantum Field Theory.
Roadkill_77 (Robin Sanderson) Fri, 06 Nov 2009 22:19:48 -0000
Andy Schofield and splitting the electron:http://bit.ly/pGaio. I thought he sounded clever when he tried to teach me Quantum Field Theory.
@mrsuniverse for a complete unified field theory try the physics of burkhard heim. his work called the unified quantum field theory.
kirkland4 (william kirkland) Fri, 06 Nov 2009 06:40:39 -0000
@mrsuniverse for a complete unified field theory try the physics of burkhard heim. his work called the unified quantum field theory.
In quantum field theory, the forces between particles are mediated by other particles. The electromagnetic force between two electrons is...
tjdemas (T.J. Demas) Wed, 04 Nov 2009 00:46:19 -0000
In quantum field theory, the forces between particles are mediated by other particles. The electromagnetic force between two electrons is...
The search for continuous symmetries only intensified with the further developments of quantum field theory.
tjdemas (T.J. Demas) Wed, 04 Nov 2009 00:44:34 -0000
The search for continuous symmetries only intensified with the further developments of quantum field theory.
New! Unified Theory UnCovered. Nassim Haramein | Super Raw Health Foods | http://bit.ly/3xEYAy | ufo disclosure obama science quantum field
SuperRawFoods (Lance Bonczkiewicz) Tue, 03 Nov 2009 14:37:17 -0000
New! Unified Theory UnCovered. Nassim Haramein | Super Raw Health Foods | http://bit.ly/3xEYAy | ufo disclosure obama science quantum field
Net Advance in Physics - Quantum Field Theory -
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