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Grand Unification Theory
Grand unification theory
Grand unification, Grand unified
theory or GUT (a misnomer, really) refers to a
theory in
physics that unifies the
strong interaction and
electroweak interaction. Several such theories have been proposed, but none
is currently universally accepted. The (future) theory that will also include
gravity is termed
theory of everything.
GUTs also predict the existence of topological defects such
as
monopoles,
cosmic strings, domain walls, and others. None have been observed and their
absence is known as the
monopole problem in
cosmology.
Some common GUT
groups are:
-
SU(5),
Georgi-Glashow model
-
SO(10)
-
SU(5)XU(1),
Flipped SU(5).
-
SU(4)XSU(2)XSU(2),
Pati-Salam model
-
SU(3)XSU(3)XSU(3),
Trinification
-
E6
-
Technicolor models
Note that it is meant that these groups are
Lie algebras. The
Lie group could be
![[SU(4)\times SU(2)\times SU(2)]/\mathbb{Z}_2](./modules/Physics_Help-MM/images/ebb9e85053e8fe27fd219d9142d705fc.gif) ,
just to take a random example.
As of 2003, there is still no hard evidence nature is
described by a GUT theory. In fact, since the
Higgs particle hasn't been discovered yet, it's not even certain if the
Standard Model is fully accurate.
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