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chiral symmetry

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  • Chiral symmetry — In quantum field theory, chiral symmetry is a possible symmetry of the Lagrangian under which the left handed and right handed parts of Dirac fields transform independently. The chiral symmetry transformation can be divided into a component that… …   Wikipedia

  • Chiral symmetry breaking — In particle physics, chiral symmetry breaking is an example of spontaneous symmetry breaking affecting the chiral symmetry of gauge theory such as Quantum Chromodynamics. The origin may be described as a fermion condensate (vacuum condensate of… …   Wikipedia

  • Chiral perturbation theory — (ChPT) is an effective field theory constructed with a Lagrangian consistent with the (approximate) chiral symmetry of quantum chromodynamics (QCD), as well as the other symmetries of parity and charge conjugation. ChPT is a theory which allows… …   Wikipedia

  • Chiral anomaly — A chiral anomaly is the anomalous nonconservation of a chiral current. In some theories of fermions with chiral symmetry, the quantization may lead to the breaking of this (global) chiral symmetry. In that case, the charge associated with the… …   Wikipedia

  • Chiral gauge theory — In quantum field theory, a chiral gauge theory is a quantum field theory with charged chiral (i.e. Weyl) fermions. For instance, the Standard Model is a chiral gauge theory. For topological reasons, chiral charged fermions cannot be given a mass… …   Wikipedia

  • Chiral ligand — In chemistry a chiral ligand is a specially adapted ligand used for asymmetric synthesis. This ligand is an enantiopure organic compound which combines with a metal center by chelation to form an asymmetric catalyst. This catalyst engages in a… …   Wikipedia

  • Symmetry — For other uses, see Symmetry (disambiguation) …   Wikipedia

  • Symmetry group — Not to be confused with Symmetric group. This article is about the abstract algebraic structures. For other meanings, see Symmetry group (disambiguation). A tetrahedron can be placed in 12 distinct positions by rotation alone. These are… …   Wikipedia

  • Chiral model — In nuclear physics, the chiral model is a phenomenological model describing mesons in the chiral limit where the masses of the quarks go to zero (without mentioning quarks at all). It s a nonlinear sigma model with the principal homogeneous space …   Wikipedia

  • chiral — Denoting an object, such as a molecule in a given configuration or conformation, that possesses chirality. A c. molecule has no plane, axis, or center of symmetry. * * * chi·ral kī rəl …   Medical dictionary

  • chiral — /ˈkaɪrəl/ (say kuyruhl) adjective Chemistry of or relating to a molecule which has no elements of symmetry; asymmetric; dissymmetric. {chir(o) + al1; coined by Lord Kelvin} –chirality, noun …  

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