PART 6: Small-scale irregularities


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The homogeneous and isotropic model is first approximation to the real Universe. In our Universe are large scale structure, cluster of galaxies and galaxies. They are the result of gravitational instability originated from the small scale density perturbations. In this section I discuss the newtonian equation for gravitational instabilty, Silk effect (radiation drag) which dampts the instabilty in radiation dominated era. The concept of dark matter in cosmology primevally arose when the structure formation was discussed. Dark matter along with its types are discussed in here.