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215 REDISCOVERING TIME<br />

that, we are told, collapse into "black holes" irreversibly devouring<br />

everything they manage to ensnare.<br />

Time has penetrated not only biology, geology, and the social<br />

sciences but also the two levels from which it has been<br />

traditionally excluded, the microscopic and the cosmic. Not<br />

only life, but also the universe as a whole has a history; this<br />

has profound implications.<br />

The first theoretical paper dealing with a cosmological<br />

model from the point of view of general relativity was published<br />

by Einstein in 1917. It presented a static, timeless view<br />

of the universe, Spinoza's vision translated into physics. But<br />

then comes the unexpected. It became immediately evident<br />

that there were other, time-dependent solutions to Einstein's cosmological<br />

equations. We owe this discovery to the Russian astrophysicist<br />

A. Friedmann and the Belgian G. Lemaitre. At the<br />

same time Hubble and his coworkers were studying the motions<br />

of galaxies, and they demonstrated that the velocity of<br />

distant galaxies is proportional to their distance from earth.<br />

The relation with the expanding universe discovered by Friedmann<br />

and Lemaitre was obvious. Yet for many years physicists<br />

remained reluctant to accept such an "historical"<br />

description of cosmic evolution. Einstein himself was wary of<br />

it. Lemaitre often said that when he tried to discuss with Einstein<br />

the possibility of making the initial state of the universe<br />

more precise and perhaps finding there the explanation of cosmic<br />

rays, Einstein showed no interest.<br />

Today there is new evidence, the famous residual blackbody<br />

radiation, the light that illuminated the explosion of the<br />

hyperdense fireball with which our universe began. The whole<br />

story appears as another irony of history. In a sense, Einstein<br />

has, against his will, become the Darwin of physics. Darwin<br />

taught us that man is embedded in biological evolution; Einstein<br />

has taught us that we are embedded in an evolving universe.<br />

Einstein's ideas led him to a new continent, as unexpected to<br />

him as was America to Columbus. Einstein, like many physicists<br />

of his generation, was guided by a deep conviction that<br />

there was a fundamental, simple level in nature. Yet today this<br />

level is becoming less and less accessible to experiment. The<br />

only objects whose behavior is truly "simple" exist in our own<br />

world, at the macroscopic level. Classical science carefully<br />

chose its objects from this intermediate range. The first ob-

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