## Abstract

We discuss various Penrose limits of conformal and nonconformal backgrounds. In AdS_{5}×T^{1,1}, for a particular choice of the angular coordinate in T^{1,1} the resulting Penrose limit coincides with the similar limit for AdS_{5}×S^{5}. In this case an identification of a subset of field theory operators with the string zero mode creation operators is possible. For another limit we obtain a light-cone string action that resembles a particle in a magnetic field. We also consider three different types of backgrounds that are dual to nonconformal field theories: The Schwarzschild black hole in AdS_{5}, D3-branes on the small resolution of the conifold and the Klebanov-Tseytlin background. We find that in all three cases the introduction of nonconformality renders a theory that is no longer exactly solvable and that the form of the deformation is universal. The corresponding world sheet theory in the light-cone gauge has a τ = x^{+} dependent mass term.

Original language | English |
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Pages (from-to) | 221-237 |

Number of pages | 17 |

Journal | Journal of High Energy Physics |

Volume | 6 |

Issue number | 5 |

State | Published - 1 May 2002 |

## Keywords

- AdS-CFT and dS-CFT Correspondence
- Penrose limit and pp-wave background