Nonlinear self-interaction of plane gravitational waves
Abstract
Recently Mendonca and Cardoso [Phys. Rev. D 66, 104009 (2002)] considered nonlinear gravitational wave packets propagating in flat space-time. They concluded that the evolution equation—to third order in amplitude—takes a similar form to what arises in nonlinear optics. Based on this equation, the authors found that nonlinear gravitational waves exhibit self-phase modulation and high harmonic generation leading to frequency up-shifting and spectral energy dilution of the gravitational wave energy. In this Brief Report we point out the fact—a possibility that seems to have been overlooked by Mendonca and Cardoso—that the nonlinear terms in the evolution equation cancels and, hence, that there is no amplitude evolution of the pulse. Finally we discuss scenarios where these nonlinearities may play a role.
- Publication:
-
Physical Review D
- Pub Date:
- April 2003
- DOI:
- 10.1103/PhysRevD.67.087501
- arXiv:
- arXiv:astro-ph/0303412
- Bibcode:
- 2003PhRvD..67h7501S
- Keywords:
-
- 04.30.Nk;
- 42.65.-k;
- 95.30.Sf;
- Wave propagation and interactions;
- Nonlinear optics;
- Relativity and gravitation;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 2 pages, to appear in Phys. Rev. D