The paper outlines principal difficulties which arise when trying to construct a consistent fundamental theory of elementary particles and fields. Different proposals how to overcome these difficulties are discussed.
For the time being the quantum gravity theory is a hypothetical theory having its objective the unification of general theory of relativity (GTR) and the field quantum theory (FQT) into one system with a single language describing and explaining the structures, properties, relations, development and laws of the universe. The ontological basis of the future quantum gravity theory should take into account the limitations imposed on it by GTR and FQT and at the same time be able to explain and predict phenomena explained and predicted by the two theories. The paper discusses the philosophical and methodological aspects which determine the creation of such a conceptual system.
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