Physical Reality and Nature of Imaginary, Complex and Hypercomplex Numbers

Theoretical and experimental studies of oscillation processes in linear electric circuits described in the article prove physical reality of concrete imaginary numbers. Since these experimental studies are available for verification at any electronic laboratory, they are quite reliable and still not refuted, in contrast to MINOS and OPERA experiments having the similar goal. Since nature is unified and consistent, the principle of physical reality of imaginary numbers is generally scientific. Therefore, theories and hypotheses of all exact sciences such as theory of relativity, quantum mechanics, optics, radio electronics, etc. should be adjusted in accordance with this principle. It is shown how it can be done, for example, in the special theory of relativity. The article presents relativistic formulas adjusted according to the principle of physical reality of imaginary numbers. They are the basis of the conception of the hidden Multiverse which consists of mutually invisible parallel universes, coexisting in different dimensions. It is alleged that astrophysical phenomenon of dark matter and dark energy, corresponding to other invisible parallel universes, except ours, is the experimental proof of existence of the hidden Multiverse. Analysis of data from WMAP and Planck spacecrafts has showed that the hidden Multiverse has a quaternion structure.