| 单词 | light cone |
| 释义 | > as lemmaslight cone light cone n. Physics [after German Lichtkegel (1918 or earlier in this sense)] (in special and general relativity) a surface in space-time, represented as a cone in three dimensions, comprising all the points from which a light signal would reach a given point (the apex of the cone) simultaneously.A light cone is a three-dimensional representation of the propagation of light in four dimensions. The two horizontal axes give spatial dimensions and the vertical axis represents time. ΘΚΠ the world > matter > physics > relativity > space-time > [noun] > conical surface light cone1921 null cone1925 1921 Nature 17 Feb. 801/1 There exists an infinitesimal ‘light-cone’ (Lichtkegel) at every position P in the world, which separates past and future in the immediate vicinity of the point P. 1964 A. O. Barut Electrodynamics i. 8 All time-like vectors are inside the light cone and the space-like ones are outside. 2015 P. S. Joshi Story Collapsing Stars ii. 22 Because the velocity of light is taken now as the universal maximum, any event can influence future events only in a ‘cone of influence,’ which is called its future light cone. < as lemmas |
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