These become impulsive for abruptly changing fields and can even cause acceleration in the direction "opposite" to the field.
A popular discussion, including the clock paradox.
According to Dr. William Brewster, Jr., of Harvard Medical School, many popularly held theories that man will not age as fast in space as he does on earth are not so. Einstein's theory suggests to some that space travel may be the fountain of youth, but "slowing up life's processes works both ways," Dr. Brewster reported at an American Rocket Society meeting. "It depends on whether you say the space ship is moving. away from the earth or the earth is moving away from the space ship. No matter which twin brother you are, you will see the other aging faster. When the two of you are back home, one will not be any older than the other."
Contends that since "time dilatation is a straightforward result of the hypothetical basis of the theory of relativity" there is no reason to doubt its existence.
The clock paradox, p.15-19. A discussion of three definitions with reference to various writings on the subject.
On the electrodynamics of moving bodies, by Albert Einstein, p.37-56, (translated from Zur Elektrodynamik Bewegter Körper, Annalen der Physik 17, 1905); Space and time, by H. Minkowski, p.75-91, (a translation from an address delivered at the 80th Assembly of German Natural Scientists and Physicists, at Cologne, 21 September 1908).
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