![]() ![]() ![]() Geodesics are the shortest path between two points, a straight line, in flat space at constant velocity, but in curved space (General Relativity) it won't normally be a straight line, as least not in the way we think of a straight line in the ordinary world around us. Generally, the events are considered not to occur in each other's future or past. When a space-like interval separates two events, insufficient time passes between their occurrences for there to exist a causal relationship crossing the spatial distance between the two events at the speed of light or slower. For a particle travelling through space at less than the speed of light, any two events which occur to or by the particle must be separated by a time-like interval. A vector whose initial and What is Zero Vector or Null Vector Definition with Examples Web1 Answer. Zero vector symbol is given by 0 (0,0,0) 0 ( 0, 0, 0) in three dimensional space and in a two-dimensional space, it written as 0 (0,0) 0 ( 0, 0). It's also called a light-like geodesic, as opposed to time-like geodesics and space-like geodesics.įor two events separated by a time-like interval, sufficient time passes between them that there could be a cause–effect relationship between the two events. A zero vector or a null vector is defined as a vector in space that has a magnitude equal to 0 and an undefined direction. When they are drawn on a spacetime diagram, they are the edges of the light cones, as in the picture below, the lines at 45 degrees. That's why it's called null, it's interval (it's "distance" in 4 D spacetime) is equal to zero and it does not have a proper time associated with it. A null geodesic is the path that a massless particle, such as a photon, follows. If direction is a null vector, then it does not define a line null vector direction example mean 4.2: Four-vectors (Part 1) - Physics LibreTexts Web6 de. ![]()
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