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Journal Article

Using gravitational lenses to detect gravitational waves


Allen,  Bruce
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Allen, B. (1990). Using gravitational lenses to detect gravitational waves. General Relativity and Gravitation, 22(12), 1447-1455. doi:10.1007/BF00756842.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-5CE4-C
Gravitational lenses could be used to detect gravitational waves, because a gravitational wave affects the travel-time of a light ray. In a gravitational lens, this effect produces time-delays between the different images. Thus the bending of light, which was the first experimental confirmation of Einstein's theory, can be used to search for gravitational waves, which are the most poorly confirmed aspect of that same theory. Applying this method to the gravitational lens 0957+561 gives new upper bounds on the amplitude of low-frequency gravitational waves in the universe, and new limits on the energy-density during an early ldquoinflationaryrdquo phase.