# The exact description of NS5-branes in the Penrose limit

Source: [The exact description of NS5-branes in the Penrose limit](<https://www.sota2.com/research/paper/68fa22e97a2b558e2933e8e5>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T05:40:51.869Z

Authors: K. Sfetsos

Published: 2003-05-13T09:06:01.000Z

## 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)\\times 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)\\times 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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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-th/0305109>)

[PDF](<https://arxiv.org/pdf/hep-th/0305109.pdf>)