Some questions to experimental gravity

Abstract

The interpretations of solutions of Einstein field's equations led to the prediction and the observation of physical phenomena which confirm the important role of general relativity, as well as other relativistic theories in physics. In this connection, the following questions are of interest and importance: whether it is possible to solve the gauge problem and of its physical significance, which one of the solutions gives the right description of the observed values, how to clarify the physical meaning of the coordinates which is unknown a priori, and why applying the same physical requirements in different gauge fixing, we obtain different linear approximations. We discuss some of the problems involved and point out several open problems. The paper is written mainly for pedagogical purposes.