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Topic: Perturbation theory

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  Quantum field theory - Wikipedia, the free encyclopedia
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.
A gauge theory is a theory which admits a symmetry with a local parameter.
For example, in every quantum theory the global phase of the wave function is arbitrary and does not represent something physical, so the theory is invariant under a global change of phases (adding a constant to the phase of all wave functions, everywhere); this is a global symmetry.
en.wikipedia.org /wiki/Quantum_field_theory   (4428 words)

 Quantum mechanics   (Site not responding. Last check: 2007-11-06)
Quantum mechanics is a theory of mechanics, a branch of physics that deals with the motion of bodies and associated physical quantities such as energy and momentum.
The Quantum field theory of the strong nuclear force is called quantum chromodynamics, and describes the Interactions of the subnuclear particles: quarks and gluons.
Quantum electrodynamics is a Quantum theory of electrons, positrons, and the electromagnetic field, and served as a role model for subsequent Quantum field theories.
quantum-mechanics.iqnaut.net   (4031 words)

 Encyclopedia :: encyclopedia : Mathematical physics   (Site not responding. Last check: 2007-11-06)
The field has concentrated in three main areas: (1) quantum field theory, especially the precise construction of models; (2) statistical mechanics, especially the theory of phase transitions; and (3) nonrelativistic quantum mechanics (Schrödinger operators), including the connections to atomic and molecular physics.
It is not surprising, then, that its developed version under the name of quantum field theory is one of the most abstract, mathematically-based areas of the physical sciences, dealing with algebraic structures such as Lie Algebras - a topic of which ordinary physicists are often ignorant.
Among the most relevant areas of contemporary mathematics in mathematically rigorous physics research are functional analysis and probability theory.
www.hallencyclopedia.com /Mathematical_physics   (573 words)

 Johan Bijnens: Chiral Perturbation Theory
This page is an attempt to allow access to many of the one-loop and two-loop calculations done in chiral perturbation theory and the programs related to those calculations.
Chiral perturbation theory: expansions in the mass of the strange quark, J.
Three-flavor partially quenched chiral perturbation theory at NNLO for meson masses and decay constants, J.
www.thep.lu.se /~bijnens/chpt.html   (857 words)

 Food for Thought
What Should be Hidden and Open in Computer Security: Lessons from Deception, the Art of War, Law, and Economic Theory [pdf]
A new TCP congestion control with empty queues and scalable stability [pdf]
FAST Kernel: Backgroung Theory and Experimental Results [pdf]
www.comms.scitech.susx.ac.uk /fft   (925 words)

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