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Ideal freely falling test bodies follow timelike geodesics, while light rays follow null geodesics in the geometric-optics limit, when nongravitational forces, finite-wavelength effects, and self-force are neglected.
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This is an authored directed relation from the source endpoint to the target endpoint.
In the test-body approximation, freely falling bodies follow geodesics of the spacetime metric.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-physics-geodesic_motioneinstein-general-relativitywp-physics-general_relativitynlab-physics-general_relativityThis is an authored directed relation from the source endpoint to the target endpoint.
Free test-body trajectories are represented by timelike or null geodesics under the stated approximation.
A mathematical concept supplies part of the formal language, state space, representation, or analytic machinery used by a scientific or mathematical-physics concept. The source is the mathematical predecessor; this does not claim that physical content follows from mathematics alone.
wp-geodesicnlab-geodesictong-grwp-physics-geodesic_motioneinstein-general-relativityEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
In geometric optics, light follows null geodesics, so the metric-dependent bending and focusing of neighboring null geodesics provide the kinematic basis for lensing observables.
The source supplies a substantive formal ingredient, dynamical sector, law, field content, or mechanism of the target theoretical framework.
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