A new method to test the cosmic distance duality relation using the strongly lensed gravitational waves

Understand

We propose a new method to test the cosmic distance duality relation using the strongly lensed gravitational waves.

• The simultaneous observations of image positions, the relative time delay between different images, the redshift measurements of lens and source, together with the mass modelling of the lens galaxy, provide the angular diameter distance to the gravitational wave source.
• On the other hand, from the observation of gravitational wave signals the luminosity distance to the source can be obtained.
• This is to our knowledge the first method to simultaneously measure both the angular diameter distance and luminosity distance from the same source.