world line The history of a particle is represented in
space-time by a
world line. This enables that position of a particle at time
t to be found by slicing space-time at time
t and finding where the slice cuts the world line of the particle. The world line of a particle is straight if the particle moves uniformly and is curved if it moves non-uniformly (i.e. there is acceleration). Rays of light can be treated as the world lines of
photons. The world lines of particles under the influence of a
gravitational field are
geodesics in space-time. The world line of a photon near a star, such as the sun, is slightly bent due to the light being deflected by the gravitational field of the sun.
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