Supergravity was much studied during the 1980s as a candidate theory of nature. As part of this it was important to understand the various supergravities that can exist in different dimensions, with the possible supergravities being classified in 1978 by Werner Nahm.[2] Type I supergravity was first written down in 1983, with Eric Bergshoeff, Mees de Roo, Bernard de Wit, and Peter van Nieuwenhuizen describing the abelian theory,[3] and then George Chapline and Nicholas Manton extending this to the full non-abelian theory.[1] An important development was made by Michael Green and John Schwarz in 1984 when they showed that only a handful of these theories are anomaly free,[4] with additional work showing that only and result in a consistent quantum theory.[5] The first case was known at the time to correspond to the low-energy limit of type I superstrings. Heterotic string theories were discovered the next year,[6] with these having a low-energy limit described by type I supergravity with both gauge groups.
Theory
Type I supergravity is the ten-dimensional supergravity with a single Majorana–Weylspinor supercharge.[nb 1] Its field content consists of the supergravity supermultiplet, together with the Yang–Mills supermultiplet with some associated gauge group.[7]: 271 Here is the metric, is the two-formKalb–Ramond field, is the dilaton, and is a Yang–Mills gauge field.[8]: 317–318 Meanwhile, is the gravitino, is a dilatino, and a gaugino, with all these being Majorana–Weyl spinors. The gravitino and gaugino have the same chirality, while the dilatino has the opposite chirality.
Here is the supercharge with a fixed chirality , where is the relevant projection operator. Meanwhile, is the charge conjugation operator and are the gamma matrices. The right-hand side must have the same chirality as the supercharges and must also be symmetric under an exchange of the spinor indices. The second term is the only central charge that is admissible under these constraints up to Poincare duality. This is because in ten dimensions only with modulo are symmetric matrices.[10]: 37–48 [nb 2] The central charge corresponds to a 5-brane solution in the supergravity which is dual to the fundamental string in heterotic string theory.[11]
The supersymmetry transformation rules are given up to three fermion terms by[12]: 324
The supersymmetry parameter is denoted by . These transformation rules are useful for constructing the Killing spinor equations and finding supersymmetric ground states.
Type I supergravity is the low-energy effective field theory of type I string theory and both heterotic string theories. In particular, type I string theory and heterotic string theory reduce to type I supergravity with an gauge group, while heterotic string theory reduces to type I supergravity with an gauge group.[13]: 92–93 There are additional corrections that the supergravity receives in string theory, notably the Chern–Simons term becomes a linear combination of the Yang–Mills Chern–Simons three-form found at tree-level and a Lorentz Chern–Simons three-form .[15] This latter three-form is a higher-derivative correction given by
,
where is the spin connection. To maintain supersymmetry of the action when this term is included, additional higher-derivative corrections must be added to the action up to second order in .
In type I string theory, the gauge coupling constant is related to the ten-dimensional Yang–Mills coupling constant by , while the coupling constant is related to the string length by .[8]: 318 Meanwhile, in heterotic string theory the gravitational coupling constant is related to the string length by .[13]: 108
The fields in the Einstein frame are not the same as the fields corresponding to the string states. Instead one has to transform the action into the various string frames through a Weyl transformation and dilaton redefinition[13]: 93
S-duality between type I string theory and heterotic string theory can be seen at the level of the action since the respective string frame actions are equivalent with the correct field redefinitions.[16] Similarly, Hořava–Witten theory, which describes the duality between heterotic string theory and M-theory, can also be seen at the level of the supergravity since compactification of eleven-dimensional supergravity on , yields supergravity.[16]
Notes
^This supergravity is sometimes written as or supergravity to indicate the chirality of the supercharge, with these two theories being equivalent up to a chirality transformation.
^There is no central charge for the first case since it is equivalent to a redefinition .
^The fields have been rescaled from Green, Schwartz, Witten,[12] as , , , along with a rescaling of all fermions by a factor of .
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