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The standard model is a quantum field theory, meaning its fundamental objects are quantum fields, which are defined at all points in spacetime. QFT treats particles as excited states (also called quanta) of their underlying quantum fields, which are more fundamental than the particles. These fields are
In particle physics, the quark model is a classification scheme for hadrons in terms of their valence quarks—the quarks and antiquarks that give rise to the quantum numbers of the hadrons. The quark model underlies "flavor SU(3)" , or the Eightfold Way , the successful classification scheme organizing the large number of lighter hadrons that ...
Spinor and scalar Yukawa model; Scalar and gauge Scalar electrodynamics; Scalar chromodynamics; Yang–Mills–Higgs; Spinor and gauge Quantum electrodynamics (QED) Schwinger model (1+1D case of QED) Quantum chromodynamics (QCD) Scalar, spinor and gauge Standard Model
A similar mysterious situation was with the Δ ++ baryon; in the quark model, it is composed of three up quarks with parallel spins. In 1964–65, Greenberg [ 19 ] and Han – Nambu [ 20 ] independently resolved the problem by proposing that quarks possess an additional SU(3) gauge degree of freedom , later called color charge.
The strength of the color force makes the properties of quark matter unlike gas or plasma, instead leading to a state of matter more reminiscent of a liquid. At high densities, quark matter is a Fermi liquid, but is predicted to exhibit color superconductivity at high densities and temperatures below 10 12 K.
In string theory, believed by some to be a consistent theory of quantum gravity, the graviton is a massless state of a fundamental string. If it exists, the graviton is expected to be massless because the gravitational force has a very long range, and appears to propagate at the speed of light.
In quantum field theory, scalar chromodynamics, also known as scalar quantum chromodynamics or scalar QCD, is a gauge theory consisting of a gauge field coupled to a scalar field. This theory is used experimentally to model the Higgs sector of the Standard Model. It arises from a coupling of a scalar field to gauge fields.
(It is a non-trivial result of quantum field theory [2] that the exchange of even-spin bosons like the pion (spin 0, Yukawa force) or the graviton (spin 2, gravity) results in forces always attractive, while odd-spin bosons like the gluons (spin 1, strong interaction), the photon (spin 1, electromagnetic force) or the rho meson (spin 1, Yukawa ...