“world line”的概念、定义、翻译、参考文献-科学参考

world line

Physics

The history of a particle as represented in space–time. The position of a particle at time t can be found by slicing space–time at time t and finding where the slice cuts the world line of the particle. The latter is straight if the particle moves uniformly and curved if it moves nonuniformly (i.e. there is acceleration). Light rays 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 as the light is deflected by the gravitational field of the sun.

Astronomy

The trajectory followed by an object in spacetime. The fact that spacetime is four-dimensional makes world lines difficult to visualize but, if the Universe had only one dimension in space and one in time, the world line could be drawn on a graph with time plotted vertically and distance plotted horizontally. A particle at rest with respect to the coordinate system would have a world line which runs along the vertical axis, while moving particles would have world lines which are curves or straight lines sloping upwards. In the real Universe, the path of a moving particle is a curved line in spacetime.

单词	world line
释义	world line Physics The history of a particle as represented in space–time. The position of a particle at time t can be found by slicing space–time at time t and finding where the slice cuts the world line of the particle. The latter is straight if the particle moves uniformly and curved if it moves nonuniformly (i.e. there is acceleration). Light rays 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 as the light is deflected by the gravitational field of the sun. Astronomy The trajectory followed by an object in spacetime. The fact that spacetime is four-dimensional makes world lines difficult to visualize but, if the Universe had only one dimension in space and one in time, the world line could be drawn on a graph with time plotted vertically and distance plotted horizontally. A particle at rest with respect to the coordinate system would have a world line which runs along the vertical axis, while moving particles would have world lines which are curves or straight lines sloping upwards. In the real Universe, the path of a moving particle is a curved line in spacetime.
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