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world tube
In physics, a world tube is the path of an object which occupies a nonzero region of space (nonzero volume) at every moment in time, as it travels through 4-dimensional spacetime. That is, as it propagates in spacetime, a world tube traces out a three-dimensional volume for every moment in time.〔Malcolm Ludvigsen: ''General relativity: a geometric approach'', Cambridge University Press, 1999, ISBN 0-521-63019-3, (p. 74 )〕 The world tube is analogous to the one-dimensional world line in that it describes the time evolution of an object in space, with the difference that a world line represents the path of a point particle (of nonzero volume), whereas a world tube occupies finite space at all moments in time.
The concept of world tube is particularly relevant for special relativity, where a world tube is embedded in Minkowski space.
==See also==
* World line
* World sheet
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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