Strong-field gravity tests with the Double Pulsar https://www.mpg.de/18014666/einstein-relativity-theory-tests
More than 100 years after Albert Einstein presented his theory of gravity, scientists around the world continue their efforts to find flaws in general relativity. The observation of any deviation from General Relativity would constitute a major discovery that would open a window on new physics beyond our current theoretical understanding of the Universe.
leader, Michael Kramer from the Max Planck Institute for Radio Astronomy (MPIfR) in Bonn