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In theoretical physics, a mass generation mechanism is a theory that describes the origin of mass from the most fundamental laws of physics. Physicists have proposed a number of models that advocate different views of the origin of mass. The problem is complicated because mass is strongly connected to gravitational interaction, and no theory of gravitational interaction reconciles with the currently popular Standard Model of particle physics. There are two types of mass generation models: gravity-free models and models that involve gravity. ==Gravity-free models== In these theories, as in the Standard Model itself, the gravitational interaction either is not involved or does not play a crucial role. *The Higgs mechanism is based on a symmetry-breaking scalar field potential, such as the quartic. The Standard Model uses this mechanism as part of the Glashow–Weinberg–Salam model to unify electromagnetic and weak interactions. This model was one of several that predicted the existence of the scalar Higgs boson. *Technicolor models break electroweak symmetry through new gauge interactions, which were originally modeled on quantum chromodynamics.〔 〕 * Coleman–Weinberg mechanism (spontaneous symmetry breaking through radiative corrections). * Models of composite W and Z vector bosons. *Top quark condensate. *Asymptotically safe weak interactions based on some nonlinear sigma models. * Symmetry breaking driven by non-equilibrium dynamics of quantum fields above the electroweak scale.〔http://www.ejtp.com/articles/ejtpv7i24p219.pdf〕 * Unparticle physics and the unhiggs〔http://arxiv.org/PS_cache/arxiv/pdf/0807/0807.3961v2.pdf〕〔http://arxiv.org/PS_cache/arxiv/pdf/0901/0901.3777v2.pdf〕 models posit that the Higgs sector and Higgs boson are scaling invariant, also known as unparticle physics. * UV-Completion by Classicalization, in which the unitarization of the WW scattering happens by creation of classical configurations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mass generation」の詳細全文を読む スポンサード リンク
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