Over the last few years, a set of new results from pulsar timing has
introduced much tighter constraints on violations of the strong equivalence
principle (SEP), either via a direct verification of the universality of free
fall for a pulsar in a triple star system, or from tests of the nature of
gravitational waves, in particular a search for dipolar gravitational wave
emission in a variety of binary pulsars with different masses. No deviations
from the SEP have been detected in our experiments. These results introduce
some of the most stringent constraints on several classes of alternative
theories of gravity and complement recent results from the ground-based
gravitational wave detectors.Comment: 5 pages, 3 figures, contribution to the 2022 Gravitation session of
the 56th Rencontres de Morion