The paper is devoted to the philosophico-methodological analysis of two fundamental theories – the string theory and the loop quantum gravitation. The theories attempt to unify the general theory of relativity and the quantum theory into one consistent theory that would describe, using a single language, universe as a unified dynamic system. The paper interprets the categories of „space“, „time“ and „time-space“. It analyses differing approaches to defining the above categories by the theories as well as contributions they make in (...) developing them. Similarly, it discusses certain theoretico-methodological problems arising for the theories in constructing the new theory. (shrink)

The paper deals with selected philosophical and methodological problems concerning the building of the quantum theory of gravitation, which is expected to unify general relativity and the quantum field theory into a single consistent and comprehensive theory. It outlines the basic ontological characteristics of such a theory, its structure and the limitations set upon it by the general relativity and the quantum field theory. Models of such a theory are described as well.

The theory of quantum gravitation, which is designed to unite the general relativity with the quantum field theory into one consistent theory, raises several major problems. The paper examines the limitations posed by general relativity on the efforts to create an ontological basis of the quantum theory of gravitation, which the latter ought to accept. It concerns mainly problems arising from relating the new field theory with the gravitational field in the general theory of relativity, the problems of the autonomy (...) of the space-time with its gravitational masses, as well as the problems of the covariance of the physical equations in the theory of quantum gravitation equations, the former being the consequence of the principle of a general covariance of the general relativity equations. (shrink)

The paper sheds light from philosophical and methodological points of view on limitations, imposed on the building of the ontological basis of the theory of quantum gravitation by the quantum field theory: 1. this basis necessarily has to be a constantly fluctuating global dynamic field; 2. the field has to be locally excited and of quantum character, i.e, with local excitations subordinated to the principle of indeterminacy and the principle of canonic relationship between commutativeness and noncommutativeness; 3. sufficient theoretical grounds (...) are needed so that quantum theory of gravitation could justify the basic concepts of the structure of the quantum field theory. The analysis of these limitations should show which fundamental concepts and categories of the quantum field theory could in their transformed forms become a part of the ontological basis of the theory of quantum gravitation. (shrink)