Recent and Future Tests of GR using Pulsar Systems

Pulsars are some of physics and astrophysics' most exotic objects, and they have proven to be exquisite tools for testing theories of gravity. The numbers of known pulsars, including those in binary or even triple systems, has more than doubled over the past decade, and promises to double again in the next. A small fraction of these systems have properties which allow them to probe GR or other theories in regimes which are incredibly hard to test otherwise. As an example, recently, a millisecond pulsar in a triple system has made the best test of the GR's Strong Equivalence Principle. In the (hopefully near) future, we will use compact pulsar binaries to test gravity at higher post-Newtonian order and will detect pulsar-black hole systems which will allow tests of fundamental black hole properties (such as the No-Hair Theorem). These results depend on keeping current "pulsar-centric" radio telescopes operational as well as the construction of much larger radio facilities (such as the SKA and ngVLA).