Spin 2 fluctuations in 1/4 BPS AdS(3)/CFT2

In this paper we study spin 2 fluctuations around a warped AdS3xS2 xT4 xI background in type IIA supergravity with small N = (0, 4) supersymmetry. We find a class of fluctuations, which will be called universal, that is independent of the background data and corresponds to operators with scaling dimension = 2l + 2, being l the angularmomentum-quantum-number on the S2 which realises the SU(2) R symmetry. We compute the central charge for N = (0, 4) two-dimensional superconformal theories from the action of the spin 2 fluctuations.