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Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them (special relativity), or a difference in gravitational potential between their locations (general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity.
The Mathematical Theory of Relativity. Cambridge University Press. Einstein considered this the finest description of the theory of relativity in any language. [3] Charles Steinmetz (1923) Four Lectures on Relativity and Space; Ludwik Silberstein (1924) The Theory of Relativity, 2nd edition, enlarged @ Internet Archive
The term "theory of relativity" was based on the expression "relative theory" (German: Relativtheorie) used in 1906 by Planck, who emphasized how the theory uses the principle of relativity. In the discussion section of the same paper, Alfred Bucherer used for the first time the expression "theory of relativity" (German: Relativitätstheorie ...
Hsu and Hsu claimed that measuring time in units of distance allowed them to develop a theory of relativity without using the second postulate in their derivation. It is the principle of relativity, that Hsu & Hsu say, when applied to 4D spacetime , implies the invariance of the 4D-spacetime interval s 2 = w 2 − r 2 {\displaystyle s^{2}=w^{2 ...
The theory of relativity does not have a concept of absolute time because there is a relativity of simultaneity. An event that is simultaneous with another event in one frame of reference may be in the past or future of that event in a different frame of reference, [ 6 ] : 59 which negates absolute simultaneity.
The theoretical study of time travel generally follows the laws of general relativity. Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), which are theoretical loops in spacetime that might make it possible to travel through time. [1] [2] [3] [4]
In this example the time measured in the frame on the vehicle, t, is known as the proper time. The proper time between two events - such as the event of light being emitted on the vehicle and the event of light being received on the vehicle - is the time between the two events in a frame where the events occur at the same location.
However, Einstein was convinced that a valid theory of gravity would necessarily have to include the relativity of inertia: So strongly did Einstein believe at that time in the relativity of inertia that in 1918 he stated as being on an equal footing three principles on which a satisfactory theory of gravitation should rest: