Type I string theory

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String theory

bosonic string theory
superstring theory
*type I string
*type II string
*heterotic string
M-theory (simplified)
string field theory
strings
branes
Related topics

quantum field theory
*gauge theory
*conformal field theory
*topological field theory
supersymmetry
supergravity
general relativity
quantum gravity
See also

string theory topics
In theoretical physics, type I string theory is one of five consistent supersymmetric string theories in ten dimensions. It is the only one whose strings are unoriented (both orientations of a string are equivalent) and which contains not only closed strings, but also open strings.

It can be obtained as an orientifold of type IIB string theory, with 32 half-D9-branes added in the vacuum to cancel various anomalies.

At low energies, type I string theory is described by the N=1 supergravity (type I supergravity) in ten dimensions coupled to the SO(32) supersymmetric Yang-Mills theory. The discovery in 1984 by Michael Green and John Schwarz that anomalies in type I string theory cancel sparked the first superstring revolution.

In the 1990s it was realized that type I string theory with the string coupling constant [g] is equivalent to the SO(32) heterotic string with the coupling [1/g]. This equivalence is known as S-duality.

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