The spacetime of double field theory: Review, remarks, and outlook
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... are subject to a covariant section constraint which implies that only a subset of the 56 internal coordinates is physical. The constraint can be written in terms of the E7p7q generators ptαq MN 1See [9] for a review and further references. 2 Such generalized spacetimes also appear in the proposal of [12]. 1 in the fundamental representation, and the invariant symplectic form ΩMN of E7p7q Ă Spp56q, a...
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"The spacetime of double field theor..." refers background in this paper
...In closed string theory, however, the field content is uniquely determined and closely related to the T-duality group O(d, d;Z) that is well known to emerge [1] when the theory is put on a torus background T ....
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"The spacetime of double field theor..." refers methods in this paper
...In fact, the gauge transformations to cubic order have been derived from closed string field theory [4], and there is a unique way to make them background independent as transformations of gij and bij [6]....
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