In theoretical physics, type II string theory is a unified term that includes both type IIA strings and type IIB strings. These account for two of the five consistent superstring theories in ten dimensions. Both theories have the maximal amount of supersymmetry — namely 32 supercharges — in ten dimensions. Both theories are base on oriented closed strings.

It was shown in the early 1990s that the various superstring theories were related by dualities, which allowed physicists to relate the description of an object in one stringtheory to the description of a different object in another theory.

The TypeIIAstringtheory and the Type IIB stringtheory are connected by T-duality; this means, essentially, that the IIAstringtheory description of a circle of radius R is exactly the same as the IIB description of a circle of radius 1/R. This is a profound result.

String theorists have found strong evidence that the two theories are really the same, even away from the extremely strong and extremely weak limits, but they do not yet have a proof strong enough to satisfy mathematicians.

In theoretical physics, type II stringtheory is a unified term that includes both typeIIAstrings and type IIB strings.

At low energies, typeIIAstringtheory is described by typeIIA supergravity in ten dimensions which is a non-chiral theory (i.e.

At low energies, type IIB stringtheory is described by type IIB supergravity in ten dimensions which is a chiral theory (left-right asymmetric) with (2,0) d=10 supersymmetry; the fact that the anomalies in this theory cancel is therefore nontrivial.

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