At order alpha'^3, the field redefinitions that reveal O(d,d) symmetry after dimensional reduction cannot be lifted to ten dimensions, contradicting manifestly T-duality-invariant formulations of string theory.
The many facets of exceptional field theory
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Exceptional field theories are the manifestly duality covariant formulations of the target space theories of string/M-theory in the low-energy limit (supergravity) or for certain truncations. These theories feature a rich system of sub-theories, corresponding to different consistent truncations. We review the structure of exceptional field theory and elaborate on various potential applications. In particular, we discuss how exceptional field theories capture some of the the magic supergravity triangles, Hull's $*$-theories related to timelike dualities, as well as the generalized supergravities related to integrable deformations of AdS/CFT.
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No manifest T-duality at order $\alpha'^3$
At order alpha'^3, the field redefinitions that reveal O(d,d) symmetry after dimensional reduction cannot be lifted to ten dimensions, contradicting manifestly T-duality-invariant formulations of string theory.