On the influence of the dark substance on electromagnetic radiation in space

   This paper investigates the influence of the gravitational fields of dark matter and dark energy, the existence of which is currently firmly established, on electromagnetic radiation in space. In the post-Newtonian approximation of the general theory of relativity, a regularity is derived that generalizes the well-known Shapiro time delay (Shapiro effect) to estimate the delay of a light beam during the Mercury location. The generalization consists of the fact that in addition to the gravitational field of the central mass, the influence of the gravitational fields of the visible (observed) medium and dark substance on the processes in space is taken into account. The cases of location of the planet Mercury and the star near the center of our Galaxy in gravitational fields created by a spherically symmetrically distributed medium are considered. Estimates of the delays of location signals are calculated, which can exceed the time delays of signals in a space not filled with a medium by several orders of magnitude. A method for estimating the density of a dark substance is indicated if the experimental estimate of the location signal delay is known. This method is illustrated by the location of Mercury as an example.

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