— n. * * * … Universalium

**superselection** — n … Useful english dictionary

**Superselection sector** — A superselection sector is a concept used in quantum mechanics when a representation of a * algebra is decomposed into irreducible components. It formalizes the idea that not all self adjoint operators are observables because the relative phase… … Wikipedia

**Order-disorder** — In quantum field theory and statistical mechanics in the thermodynamic limit, a system with a global symmetry can have more than one phase. For parameters where the symmetry is spontaneously broken, the system is said to be ordered. When the… … Wikipedia

**Mathematical formulation of quantum mechanics** — Quantum mechanics Uncertainty principle … Wikipedia

**Infraparticle** — In electrodynamics and quantum electrodynamics, in addition to the global U(1) symmetry related to the electric charge, we also have position dependent gauge transformations. Noether s theorem states for every infinitesimal symmetry… … Wikipedia

**Quantum decoherence** — Quantum mechanics Uncertainty principle … Wikipedia

**Wightman axioms** — Quantum field theory (Feynman diagram) … Wikipedia

**Einselection** — is short for environment induced superselection, a nickname coined by Wojciech H. Zurek.Wojciech H. Zurek, Decoherence, einselection, and the quantum origins of the classical, Reviews of Modern Physics 2003, 75, 715 or [http://arxiv.org/abs/quant … Wikipedia

**Weinberg-Witten theorem** — Steven Weinberg and Edward Witten consider the so called emergent theories to be misguided. During the 80 s, preon theories, technicolor and the like were very popular and some people were speculating that gravity might be an emergent phenomena… … Wikipedia