Great unification

See also: GUT

In Theoretical physics, a theory of great unification , still called GUT (for Large Unified Theory in English) indicates a model extending the standard model of the Physique of the particles in which all the fundamental interactions (except Gravitation) are described with same the constant of coupling. The interactions in question are:

• the electromagnetism

• the weak Interaction or forces weak
• the strong Interaction or forces strong

Let us note that in its actual position the standard model, although very precis, has nevertheless much free parameters and in particular described the three preceding fundamental interactions with three different constants of coupling.

Currently, no theory GUT still convinced of its complete success.

The KNOWN model (5)

August 1st

The scale of great unification

See also: Scales in physics

Unification in physics

Generally, it is natural in physics to seek to unify the description of the interactions. James C. Maxwell was the first to carry out the magnetic unification of the phenomena and electric with its theory of the electromagnetism. With the advent of the quantum Mechanical and the development of the quantum version of quantum electromagnetism called electrodynamic it was possible to mix the latter with the weak Interaction more recently discovered within the électrofaible theory. The discovery thereafter of the quantum Chromodynamique explaining the structure of the Atomic nucleus in term of the Quark S will be then the last part of the building consisted the standard model which incorporates the three interactions in a unified theory based on a Groupe of gauge $SU\; (3)\; \backslash \; times\; KNOWN\; (2)\; \backslash \; times\; U\; (1)\; \backslash ,$.

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