Creating spatial flatness by combining string gas cosmology and power law inflation

摘要: We show that it is possible to combine an early phase of String Gas Cosmology which can explain the origin observed structures on cosmological scales with a short later period power law inflation creates spatial flatness. The resulting model consistent ``swampland criteria'' and constraints coming from {\it Trans-Planckian Censorship Conjecture}. Such construction not using only canonical slow-roll inflation, but emerge in warm scenario or cold exponential potential. cosmology non-singular. discuss spectrum perturbations our scenario. On large (scales remain larger than Hubble radius after initial string gas phase) determined by thermal fluctuations set up primordial phase, almost scale-invariant slight red tilt. small scales, produced during inflationary dominate. these once again nearly scale-invariant. There intermediate range enter inflation) where are damped continue dominate over those inflation. has sharp spectral index $n_s - 1 \sim -2$.