Carnot's theorem (thermodynamics): Difference between revisions

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The '''grand unification energy''' <math>\Lambda_{GUT}</math>, or the '''GUT scale''', is the energy level above which, it is believed, the [[electromagnetic force]], [[weak force]], and [[strong force]] become equal in strength and unify to one force governed by a [[Simple Lie algebra|simple Lie group]]. Specific [[Grand unified theory|Grand unified theories]] (GUTs) can predict the grand unification energy but, usually, with large uncertainties due to model dependent details such as the choice of the [[Yang-Mills Theory|gauge group]], the [[Higgs]] sector, the matter content or further free parameters. Furthermore, at the moment it seems fair to state that there is no agreed ''minimal GUT''.
 
The unification of the [[electroweak force]]s and the [[strong force]] with the [[gravitational force]] in a so-called [[theory of everything|"Theory of Everything"]] requires an even higher energy level which is generally assumed to be close to the [[Planck Scale]]. In theory, at such short distances, gravity becomes comparable in strength to the other three forces of nature known to date. This statement is modified if there exist additional dimensions of space at intermediate scales. In this case, the strength of gravitational interactions increases faster at smaller distances, and the energy scale at which all known forces of nature unify, can be considerably lower. This effect is exploited in models of [[large extra dimensions]].
 
The exact value of the grand unification energy (if grand unification is indeed realized in nature) depends on the precise physics present at shorter distance scales not yet explored by experiments. If one assumes the [[Desert (particle physics)|Desert]] and [[supersymmetry]], it is at around 10<sup>16</sup> GeV.
 
The most powerful [[particle accelerator|collider]] to date, the [[LHC]], is designed to reach a center of mass energy of 1.4x10<sup>4</sup> GeV in proton-proton collisions. The scale 10<sup>16</sup> GeV is only a few [[orders of magnitude]] below the [[Planck scale]], and thus not within reach of man-made earth bound colliders.
<ref>
{{cite book
|last=Ross |first=G.
|year=1984
|title=Grand Unified Theories
|pages=
|publisher=[[Westview Press]]
|isbn=978-0-8053-6968-7
}}</ref>
==See also==
 
*[[Desert (particle physics)]]
*[[Timeline of the Big Bang]]
 
==References==
{{Reflist}}
 
{{particle-stub}}
 
[[Category:Particle physics]]

Revision as of 22:29, 29 January 2014

The grand unification energy ΛGUT, or the GUT scale, is the energy level above which, it is believed, the electromagnetic force, weak force, and strong force become equal in strength and unify to one force governed by a simple Lie group. Specific Grand unified theories (GUTs) can predict the grand unification energy but, usually, with large uncertainties due to model dependent details such as the choice of the gauge group, the Higgs sector, the matter content or further free parameters. Furthermore, at the moment it seems fair to state that there is no agreed minimal GUT.

The unification of the electroweak forces and the strong force with the gravitational force in a so-called "Theory of Everything" requires an even higher energy level which is generally assumed to be close to the Planck Scale. In theory, at such short distances, gravity becomes comparable in strength to the other three forces of nature known to date. This statement is modified if there exist additional dimensions of space at intermediate scales. In this case, the strength of gravitational interactions increases faster at smaller distances, and the energy scale at which all known forces of nature unify, can be considerably lower. This effect is exploited in models of large extra dimensions.

The exact value of the grand unification energy (if grand unification is indeed realized in nature) depends on the precise physics present at shorter distance scales not yet explored by experiments. If one assumes the Desert and supersymmetry, it is at around 1016 GeV.

The most powerful collider to date, the LHC, is designed to reach a center of mass energy of 1.4x104 GeV in proton-proton collisions. The scale 1016 GeV is only a few orders of magnitude below the Planck scale, and thus not within reach of man-made earth bound colliders. [1]

See also

References

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