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Explore how objects' motion is influenced by their own electromagnetic, gravitational, and other fields in this theoretical physics colloquium. Learn about the unifying principle that self-interaction effects can be viewed as equivalent to test-body motion in particular effective fields, understanding how this principle originates and the nature of these effective fields. Discover recent research developments that allow this principle to be derived across a wide variety of contexts, including how the effective-field interpretation serves as a regularization procedure in point-particle limits. Examine how regularizations can be derived from first principles as singular limits of ordinarily-nonsingular results that remain useful for finite bodies, with applications to understanding how self-interaction affects object inertia and drives binary inspirals in general relativity.
