Stanley Jaki on the Copenhagen Theory

‘Whatever the distance of human passions from atomic physics, the real question was whether one’s epistemological attitude was truly general, that is, consistent or not. The impression Bohr gave was that one was to have two kinds of epistemology, one for atomic phenomena, another for everything else, but it was still to be explained whether the understanding, or episteme, could be split in two. On this decisive point Bohr gave at best an impression which was vague and superficial. Staying with superficial impressions means staying on the surface, and this in turn implies the avoidance of deep questions. Typically enough, Bohr completed the final review of his epistemological conflict with Einstein with the remark that “through a singularly fruitful cooperation of a whole generation of physicists we are nearing the goal wheere logical order to a large extent allows us to avoid deep truth.” The most obvious of such deep truths should have been for Bohr the truth of the complementarity of matter and light, waves and particles, atomic stability and indeterminacy. The truth that they were complementary to one another was not a matter of observation, but an inference, and a genuinely metaphysical one, which had no justification in the Copenhagen theory. The truth in question was about the truth of a reality which had complementary aspects. These aspects could really complement one another only if they inhered in a deeper reality, about which Bohr could only be agnostic. A harmony of relations or aspects, complementing one another, such was Bohr’s epistemological message, a message void of reference to the ontological reality of anything harmonious. About the entity which embodied the harmony of relations he was not permitted by his own premises to make any claim and he carefully avoided doing so. In a truly pragmatist way, which he learned from Hoffding, a forerunner of William James, Bohr could speak of fruits, though not of their harmny (which is never a matter of direct observation) and certainly not of the tree which produced the fruits, to say nothing of the soil which supported and nourished the tree. For Bohr the deepest aspect of existence was pragmatic fruitfulness, the rather shallow perspective in which he saw physics itself: “Perhaps the most distinguishing characteristic of the present position of physics is that almost all the ideas which have ever proved to be fruitful in the investigating of nature have found their right place in a common harmony without thereby having diminished their fruitfulness.”

As will be seen shortly, this was not even true of quantum mechanics, a fact which should surprise no one. The really creative elements of quantum mechanics are not the data observed by physicists bu the marvelous ideas formed in their heads. Of those heads few were as impressive as that of Bohr, who for many was a twentieth-century Moses with two flaming horns on his forehead. The horns were the horns of complementarity, but as interpreted by Bohr they could not secure reality to the atomic realm, to say nothing of Moses or Bohr himself. Bohr’s pairs of complementarity resembled pairs of horns from which one could not even infer unambiguously that they were rooted in the same head and thereby truly complementary or that the head itself was real, and even more fundamentally real than the horns themselves.’ (Stanley Jaki, ‘The Road of Science and he Ways to God’, p. 205-206)

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