Comment about the ”Newtonian limit of String-Dilaton Gravity” paper.

Comment about the " Newtonian limit of String-Dilaton Gravity " paper. The objective of this brief comment is to point out several problems associated with the general framework underpinning this paper[1]. For one, analyzing the static, spherically symmetric solution of scalar-tensor, vector-metric as well as string-dilaton theories one can find the following. When the energy-momentum tensor T=T µ µ vanishes the solutions of field equations of these theories amongst the others equivalent to Schwarzachild solution in general relativity. Moreover, for Jordan, Brans Dicke scalar-tensor theory the Hawking theorem states that the Schwarzschild metric is the only spherically symmetric solution of the vacuum field equations. In this case no celestial-mechanical experiments to reveal a difference between gravity theories is not presented possible, since all Einsteins vacuum solution (Schwarzschild, Kerr, etc.) will satisfy these theories too. On the other hand inside the mater gravitation is greatly distinguished from Einstein theory. Thus, in this case effects considered like the fifth force and the differences between relativistic theories should be experimentally tested in substance. This fact is matter of debate since in this point of view the dark matter problem may be explain by variations of mater properties inside the galaxies and galaxies clusters. For example, scalar field, inside the matter has characteristics like gravitation permeability of material similar electromagnetic permeability of material in Maxwell theories of electromag-netism. Consequence there is a significant difference in characteristics of galaxy models under similar boundary conditions for various relativity theories. Standard literature on gravitation describes any modification of celestial mechanics due to relativistic theories is obtained by a perturbative expan