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Originally Posted by neutralino  I've never heard of the fourth dimension to be called "time and motion"; the fourth dimension in Einsteinian gravity is time. That is, it is the fourth dimension of a four dimensional spacetime manifold of which the remaining three dimensions are spatial dimensions. I don't understand your questioning of "what are dimensions." The number of dimensions of a space(time) are the number of degrees of freedom, or the number of coordinates that one needs to give to a point in order to determine its position uniquely. In four dimensional spacetime, this is 4; (t,x,y,z). Note that there is nothing to do with motion here; I can slice through the spacetime at a particular moment, and find the position of the particle, whether it is moving or not. |
Einstein's tensor equations find the 4th dimension to be prevalent in all matter. All matter is in motion. Motion is interchangeably synonymous with time (the interval - distance - between two or more events). The definitional context of dimensions at issue here is that of right angle motion - perpendicularity - relative to preceding coordinates, as described and illustrated in the subected text. Until further notice, there are no particles that are not in motion. You may slice through time with calculus or other non metric mathematical means, but you cannot flash freeze a moving particle in real - metric - time. In lieu of 0o K being observed or achieved in the laboratory, everything has something to do with motion (Timotion).