$I$ in generalized supergravity

Abstract

We showed in previous work that for homogeneous Yang-Baxter (YB) deformations of AdS${}_5\times$S${}^5$, the open string metric and coupling, and as a result the closed string density $e^{-2\Phi }\sqrt{g}$, remain undeformed. In this work, in addition to extending these results to the deformation associated with the modified CYBE, or $\eta$-deformation, we identify the Page forms as the open string counterpart for RR fields and demonstrate case by case that the non-zero Page forms remain invariant under YB deformations. We give a physical meaning to the Killing vector $I$ of generalized supergravity and show for all YB deformations: 1) $I$ appears as a current for center of mass motion on the worldvolume of a D-branes probing the background, 2) $I$ is equal to the divergence of the noncommutativity parameter, 3) $I$ exhibits "holographic" behavior, where the radial component of $I$ vanishes at the AdS boundary, and 4) in pure spinor formalism $I$ is related to a certain state in the BRST cohomology.

11 pages, 2 column; v2 references updated; v3 to appear in EPJC

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