QUANTIZATION OF THE GRAVITATIONAL FIELD. THEORETICAL AND EXPERIMENTAL SUBSTANTIATION OF THE GRAVITATIONAL-ELECTROMAGNETIC RESONANCE. THE PHYSICAL NATURE OF THE QUANTUM OF THE GRAVITATIONAL FIELD.WHY THE SPEED OF LIGHT IN VACUUM IS CONSTANT

It is shown that gravitating objects that are at rest, or move without acceleration, create a standing gravitational wave in space. The length of this wave is a quantization step of the gravitational field. It is proportional to the mass of the gravitating object. The coefficient of proportionality is a value that is inverse to the linear density of the Planck mass, that is, proportional to the linear rarefaction of the Planck mass. A physically standing gravitational wave is a curvature, deformation of space under the influence of the gravitational field of a gravitating object. If we imagine a gravitating object as a material point, then the geometric picture of a standing gravitational wave can be represented as a set of hierarchical spherical equipotential surfaces embedded in each other, the radius of which changes away from the center of gravity by the value of the quantization step. It is shown that a standing gravitational wave has a quantum character. The quantum of the gravitational field is the square of the speed of light in a vacuum. The quantum of the gravitational field is equal to the gravitational potential of the gravitating object at a distance from it equal to the quantization step. Theoretical and experimental substantiation of the presence of gravitational-electromagnetic resonance (GER) in nature is given. This resonance arises when the wave vectors of a standing gravitational wave and an electromagnetic wave traveling in space are equal. GER is the basis for modulating the emission spectrum of stars and their clusters. The wavelength of the envelope of the spectrum is proportional to the mass of the radiating object. By measuring the wavelength of the envelope, one can accurately estimate the mass of the radiating object. The physical nature of the quantum gravitational field is the kinematic gravitational viscosity of the gravitational field of the baryonic matter of the observable Universe. Keywords: Maxwell-like equations of the gravitational field, the standing gravitational wave, the quantum of the gravitational field, the gravitational electromagnetic resonance, Planck constants, kinematic viscosity of the gravitational field.