Origin of primordial inhomogeneities of the Universe

The problem of the origin of primordial sound waves in the early hot Universe, which lead to production of the large scale structure of the observed Universe, is considered. A general principle determining initial metric fluctuations at the moment of time close to the Planckian, is proposed. The hypothesis of uniform distribution at the initial moment of the ''initial state'' energy in all physical degrees of freedom is delivered. Primordial sound waves of the needed amplitude are shown to appear from the initial potential metric fluctuations due to the parametric amplification effect. The spectra of the created primordial sound waves are found