Quantum Physics and Philosophy–Causality and Complementarity

Arkady Plotnitsky

L. Rosenfeld

Leon Monroe Miller

The theory of complementarity became prominent during the last century (primarily as a result of the ideas of Niels Bohr and quantum physics). It gradually developed into a dominant paradigm un-derlying research into the nature of existence. Bohr’s exposition of the principle also emphasized its epistemological value for providing more accurate information regarding what seem to be paradoxical aspects of reality. The principle of complementarity has proven to have far reaching philosophical im-plications concerning such basic notions as subject and object, space-time and causality, chance and necessity, and more. However, scholars also acknowledge that it contributes to resolving the problem of the discontinuity between underlying reality and the human ability to conceptualize the ontological nature of existence. It has grown in popularity because it seems to off er a means of addressing dichoto-mies in other sciences and in philosophy.When analysts scrutinize the factors that infl uenced Bohr’s understanding of the principle of comple-mentarity they fi nd that one source clearly stems from the infl uence of American Pragmatism. Although the Pragmatist infl uence is traced primarily to William James there is at the roots of the philosophy of Pragmatism reference made to concepts that refl ect the principle of complementarity explicating how to gain reliable knowledge concerning the nature of existence. From the very inception of American Prag-matism there was the recognition that Western philosophy faced a problem connected with

Henry F. Birkenhauer

Patrick A. Heelan

This book deals with the 'crisis of objectivity' and the 'crisis of realism' which overtook physics when Heisenberg and Bohr consciously rejecting the intentionality-structure of classical physics, gave physics a new form and a new philosophy. The new physics was called quantum mechanics and the new philosophy was called complimentarity. Using the method 'analysis of horizons,' the author attempts to disentangle the epistemological and ontological pesuppositions of Heisenberg's view of complementarity. A similar analysis of Bohr's view of complimentarity reveals a remarkable contrast in basic philosophy between the two founders of quantum physics. The author distinguishes various kinds of objectivity and realism and discusses critically the different aspects of the crisis that emerges in the quantum theory of measurement, the indeterminacy relations and in the statistical and causal structure of quantum mechanics. Heisenberg's formulation of the crisis is reduced to the underlying presuppositions of his thought. These presuppositions are criticised and shown to be defective. A more nuanced epistemological analysis reveals that quantum mechanics answers in a specially beautiful way to the full exigencies of the human mind and its knowledge of concrete reality.