Abstract
We construct plane wave backgrounds with time-dependent profiles corresponding to Penrose limits of NS5-branes with transverse space symmetry group broken from SO(4) to SO(2)× Z N . We identify the corresponding exact theory as the five-dimensional logarithmic Conformal Field Theory (CFT) arising from the contraction of the SU(2) N′ / U(1)× SL(2, R) − N exact CFT, times R 5 . We study several general aspects and construct the free field representation in this theory. String propagation and spectra are also considered and explicitly solved in the light-cone gauge.
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