Gravity Tests with Radio Pulsars in Perturbative and Nonperturbative Regimes

Searches for empirical clues beyond Einstein’s General Relativity are crucial to understand gravitation and spacetime. Radio pulsars have been playing an important role in testing gravity theories since the 1970s. Because radio timing of binary pulsars is very sensitive to changes in the orbital dynamics, small deviations from what General Relativity predicts can be captured or constrained. In this sense, the gravity sector on the Standard-Model Extension was constrained tightly with a set of pulsar systems. Moreover, compact objects like pulsars may develop nonperturbative deviations from General Relativity in some specific alternative gravity theories, thus radio pulsars also provide rather unique testbeds in the strong-gravity regime.