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Originally Posted by Kizzi
What was he refering to when he said "God doesn't play dice".
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He was referring to one of the consequences of the interpretation of Quantum Physics commonly called the
Copenhagen Interpretation (see
“criticisms” for a reference to the Einstein quote). Under this interpretation, the universe – precisely, the quantum wave function (conventionally represented by the Greek letter Psi) describing every particle in the universe – has one value/state before a specific measurement is made, then, following the measurement, “renormalizes” to a value where the measurement made has a 100% chance of having occurred.
For example, if a single photon is emitted toward a pair of closely-spaced slits in a diffraction grating, the wave function predicts a 50% chance that it will pass through one slit, a 50% chance that it will pass thought another, and no chance that anything else will happen to it. A measurement can be made to determine which slit the photon actually passes throught – blocking one slit, for instance, and detecting if it arrives at a photographic plate or electronic photomultiplier. The act of making this measurement is the equivalent of rolling a die, or flipping a coin, yet, according to the Copenhagen Interpretation, its outcome has a real and measurable impact on the future of the universe. This bothered Einstein, and continues to bother people to this day, in a way he was unable to express more clearly than with his famous quote.
No. Although raised Jewish, Einstein did not believe in the tenants of Judaism. He expressly and in writing denied belief in a “personal God”, writing
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I believe in Spinoza's God who reveals himself in the orderly harmony of what exists, not in a God who concerns himself with the fates and actions of human beings.
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Briefly put, belief in “Spinoza’s God” is the belief that “God”, “nature”, “the universe”, and “everything there is” are all words or phrases describing the same thing.
This belief, a common one among scientists and mathematicians, is important to know was shared by Einstein if you wish to understand quotes of his like “"God does not play dice". What he actually meant was “the universe is not random, but deterministic”.