Ehlers-Harrison-type transformations in dilaton-axion gravity
Ehlers-Harrison-type transformations in dilaton-axion gravity
The ten-parametric internal symmetry group is found in the D=4 Einstein-Maxwell-dilaton-axion theory restricted to space-times admitting a Killing vector field. The group includes dilaton-axion SL(2,R) duality and Harrison-type transformations which are similar to some target-space duality boosts, but act on a different set of variables. A new symmetry is used …