Tulsi Prajna 1990 09

SR No.: 524563
Original Sutra Author: N/A
Author: Mangal Prakash Mehta
Publisher: Jain Vishva Bharati
Publication Year: 1990
Total Pages: 80
Language: Hindi
Classification: Magazine, India_Tulsi Prajna, & India
File Size: 4 MB

Page 61

Vol. XVI, No. 2.
57
Another remarkable feature of the gravitational fields is that through a number of identical, transformations of the equations, the equations can be turned into the equations of motion" of the physical system responsible for the gravitational field concerned. Thus the gravitational field equations incorporate the equations of the matter which creates the field. It should be noted, however, that the gravitational field equations do not determine completely the distribution and motion of matter. 11
POST-BINSTEININ SCIENTIFIC CONCEPT
The theory of relativity brought about some revolutionary changes in the concepts of modern physics. Amongst them the most startling one was regarding the nature of space and time. Einstein, in the light of his theory of relativity, imagined the universe as a "four-dimensional continuum of space and time ” According to Einstein, the three dimensions of space and one dimension of time are welded together forming a four-dimensional volume which he described as a continuum." According to great German mathemati. cian, Herman Minkowski, who developed the mathematics of the space-time continuum as a convenient medium for expressing the principles of Relativity, "Space and time separately have vanished into the merest shadows, and only a sort of combination of the two preserves any reality."12
It is very difficult to describe the new concept without the use of mathematics. But still the concept of "four-dimensional continuum" may be explained in simple language as follows: it is a simple fact that when a body exists in space, it occupies the three dimensions of space, on account of its length, breadih and height (or depth). Now, when it changes its position in space (i.e. when its motion takes place), it takes some time. Thus, to describe the motion of any body we should have the knowledge of two factors : its position in space and time required to change the position. The position is described by the three dimensions of space. Hence, time is reffered to as the fourth dimension. Now, the theory of relativity welds together the three dimensions of space and the fourth dimension of time.
Minkowski showed that the theory of relativity required all electrical phenomena (all physical phenomena are considered to be ultimately electrica!) to be thought of as occurring not in space and time seprately as had hitherto been thought, but in space and time welded together so thoroughly that it was impossible to detect any