View source for Physics:U-duality

{{Short description|Duality combining S-duality and T-duality}}
{{String theory|cTopic=Theory}}

In [[Physics:Physics|physics]], '''U-duality''' (short for '''unified duality''')<ref>S. Mizoguchi, "[http://iopscience.iop.org/0264-9381/17/4/308 On discrete U-duality in M-theory]", 2000.</ref> is a symmetry of [[Physics:String theory|string theory]] or [[Physics:M-theory|M-theory]] combining [[Physics:S-duality|S-duality]] and [[Physics:T-duality|T-duality]] transformations. The term is most often met in the context of the "U-duality (symmetry) group" of M-theory as defined on a particular background space ([[Topological manifold|topological manifold]]). This is the union of all the S-duality and T-duality available in that topology. The narrow meaning of the word "U-duality" is one of those dualities that can be classified neither as an S-duality, nor as a T-duality - a transformation that exchanges a large geometry of one theory with the strong coupling of another theory, for example.

==References==
{{reflist}}

[[Category:String theory]]
{{String theory topics |state=collapsed}}


{{Sourceattribution|U-duality}}