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We show that standard puzzles of hot Big Bang cosmology that motivated theintroduction of cosmological inflation, such as the smoothness and horizonproblem, the flatness problem and the relic problem are also solved byholographic models for very early universe based on perturbative threedimensional QFT. In the holographic setup, cosmic evolution is mapped toinverse renormalization group (RG) flow of the dual QFT, and the resolution ofthe puzzles relies on properties of the RG flow.

Holography for the very early Universe and the classic puzzles of Hot Big Bang cosmology