Abstract
A system of D1and D5-branes with a Kaluza-Klein momentum is re-investigated using the five-dimensional U -duality group E6(+6)(Z). We show that the residual U -duality symmetry that keeps this D1-D5-KK system intact is generically given by a lift of the Weyl group of F4(+4), embedded as a finite subgroup in E6(+6)(Z). We also show that the residual U -duality group is enhanced to F4(+4)(Z) when all three charges coincide. We then apply the analysis to the AdS3/CFT2 correspondence and discuss that among 28 marginal operators of CFT2 which couple to massless scalars of AdS3 gravity at the boundary, 16 would behave as exactly marginal operators for generic D1-D5-KK systems. This is shown by analyzing possible three-point couplings among the 42 Kaluza-Klein scalars with the use of their transformation properties under the residual U -duality group.
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