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phenomenological coupling constant

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  • Technicolor (physics) — Beyond the Standard Model Standard Model …   Wikipedia

  • QCD vacuum — The QCD vacuum is the vacuum state of quantum chromodynamics (QCD). It is an example of a non perturbative vacuum state, characterized by many non vanishing condensates such as the gluon condensate or the quark condensate. These condensates… …   Wikipedia

  • Alternatives to general relativity — are physical theories that attempt to describe the phenomena of gravitation in competition to Einstein s theory of general relativity.There have been many different attempts at constructing an ideal theory of gravity. These attempts can be split… …   Wikipedia

  • Landau pole — In physics, Landau pole is the energy scale (or the precise value of the energy) where a coupling constant (the strength of an interaction) of a quantum field theory becomes infinite. Such a possibility was pointed out by the physicist Lev… …   Wikipedia

  • Feynman diagram — The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… …   Wikipedia

  • Topological string theory — In theoretical physics, topological string theory is a simplified version of string theory. The operators in topological string theory represent the algebra of operators in the full string theory that preserve a certain amount of supersymmetry.… …   Wikipedia

  • Non-critical string theory — The non critical string theory describes the relativistic string without enforcing the critical dimension. Although this allows the construction of a string theory in 4 spacetime dimensions, such a theory usually does not describe a Lorentz… …   Wikipedia

  • Quantum electrodynamics — (QED) is a relativistic quantum field theory of electrodynamics. QED was developed by a number of physicists, beginning in the late 1920s. It basically describes how light and matter interact. More specifically it deals with the interactions… …   Wikipedia

  • Stochastic vacuum model — In physics, the stochastic vacuum model is a nonpertubative, phenomenological approach to derive cross section in quantum chromodynamics.It is deemed impossible, to calculate the vacuum averages of gauge invariant quantities in QCD in a closed… …   Wikipedia

  • Jet (particle physics) — A jet is a narrow cone of hadrons and other particles produced by the hadronization of a quark or gluon in a particle physics or heavy ion experiment. Because of QCD confinement, particles carrying a color charge, such as quarks, cannot exist in… …   Wikipedia

  • Landau, Lev Davidovich — ▪ Russian physicist born Jan. 9 [Jan. 22, New Style], 1908, Baku, Russian Empire (now Azerbaijan) died April 1, 1968, Moscow, Russia, U.S.S.R.  Soviet theoretical physicist, one of the founders of the quantum theory of condensed matter whose… …   Universalium

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