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Paper   IPM / Astronomy / 16110
School of Astronomy
  Title:   Twisted gravitational waves in the presence of a cosmological constant
1.  H. Firouzjahi
2.  B. Mashhoon
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  100
  Year:  2019
  Supported by:            ipm IPM
We find exact nonlinear solutions of general relativity that represent twisted gravitational waves (TGWs) in the presence of a cosmological constant. A TGW is a nonplanar wave propagating along a fixed spatial direction with a null Killing wave vector that has a nonzero twist tensor. The solutions all turn out to have wave fronts with negative Gaussian curvature. Among the classes of solutions presented in this paper, we find a unique class of simple conformally flat TGWs that is due to the presence of a negative cosmological constant and therefore represents part of anti�??de Sitter spacetime. The properties of this special solution are studied in detail.

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