Rational Reconstructions of Modern Physics Newtons classical physics and its underlying ontology are loaded with several metaphysical hypotheses that cannot be justified by rational reasoning nor by experimental evidence. Furthermore it is well known that some of these hypotheses are not contained in the great theories of modern physics such as the theory of relativity and quantum mechanics. This book shows that on the basis of Newtons classical physics and by rational reconstruction the theory of relativity as well as quantum mechanics can be obtained by partly eliminating or attenuating the metaphysical hypotheses. Moreover it is shown that these reconstructions do not require additional hypotheses or new experimental results.