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- Type_I_string_theory abstract "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.The classic 1976 work of Ferdinando Gliozzi, Joel Scherk and David Olive paved the way to a systematic understanding of the rules behind string spectra in cases where only closed strings are present via modular invariance but did not lead to similar progress for models with closed strings, despite the fact that the original discussion was based on the type I string theory.As first proposed by Augusto Sagnotti in 1987, the type I string theory 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 H. Schwarz that anomalies in type I string theory cancel sparked the first superstring revolution. However, a key property of these models, shown by A. Sagnotti in 1992, is that in general the Green-Schwarz mechanism takes a more general form, and involves several two forms in the cancellation mechanism.The relation between the type-IIB string theory and the type-I string theory has a large number of surprising consequences, bothin ten and in lower dimensions, that were first displayed by the String Theory group at the University of Rome "Tor Vergata" in the early Nineties. It opened the way to the construction of entire new classes of string spectra with or without supersymmetry. Joseph Polchinski's work on D-branes provided a geometrical interpretation for these results in terms of extended objects (D-brane, orientifold).In the 1990s it was first argued by Edward Witten that type I string theory with the string coupling constant is equivalent to the SO(32) heterotic string with the coupling . This equivalence is known as S-duality.References[1] F. Gliozzi, J. Scherk and D.I. Olive, ``Supersymmetry, Supergravity Theories And The Dual Spinor Model, Nucl. Phys. B122 (1977) 253.[2] E. Witten, ``String theory dynamics in various dimensions, Nucl. Phys. B443 (1995) 85 [arXiv:hep-th/9503124].[3] J. Polchinski, S. Chaudhuri and C.V. Johnson, ``Notes on D-Branes, arXiv:hep-th/9602052.[4] C. Angelantonj and A. Sagnotti, ``Open strings, Phys. Rept. 1 [Erratum-ibid. ) 339] [arXiv:hep-th/0204089].".
- Type_I_string_theory wikiPageID "672291".
- Type_I_string_theory wikiPageRevisionID "598862175".
- Type_I_string_theory hasPhotoCollection Type_I_string_theory.
- Type_I_string_theory subject Category:String_theory.
- Type_I_string_theory comment "In theoretical physics, type I string theory is one of five consistent supersymmetric string theories in ten dimensions.".
- Type_I_string_theory label "Teoria di stringa tipo I".
- Type_I_string_theory label "Teoría de cuerdas de Tipo I".
- Type_I_string_theory label "Théorie des cordes de type I".
- Type_I_string_theory label "Type I string theory".
- Type_I_string_theory sameAs Teoría_de_cuerdas_de_Tipo_I.
- Type_I_string_theory sameAs Théorie_des_cordes_de_type_I.
- Type_I_string_theory sameAs Teoria_di_stringa_tipo_I.
- Type_I_string_theory sameAs m.031nrp.
- Type_I_string_theory sameAs Q2276860.
- Type_I_string_theory sameAs Q2276860.
- Type_I_string_theory wasDerivedFrom Type_I_string_theory?oldid=598862175.
- Type_I_string_theory isPrimaryTopicOf Type_I_string_theory.