sexta-feira, novembro 24, 2006

Does God Play Dice?

To sum up, what I have been talking about, is whether the universe evolves in an arbitrary way, or whether it is deterministic.
The classical view, put forward by Laplace, was that the future motion of particles was completely determined, if one knew their positions and speeds at one time.
This view had to be modified, when Heisenberg put forward his Uncertainty Principle, which said that one could not know both the position, and the speed, accurately.
However, it was still possible to predict one combination of position and speed. But even this limited predictability disappeared, when the effects of black holes were taken into account.
The loss of particles and information down black holes meant that the particles that came out were random.
One could calculate probabilities, but one could not make any definite predictions.
Thus, the future of the universe is not completely determined by the laws of science, and its present state, as Laplace thought.
God still has a few tricks up his sleeve.
That is all I have to say for the moment.

Thank you for listening.

Stephen Hawking

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