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We present a short introduction to a non-standard cosmological scenariomotivated by the duality symmetries of string theory, in which the big bangsingularity is replaced with a "big bounce" at high but finite curvature. Thebouncing epoch is prepared by a long (possibly infinitely extended) phase ofcosmic evolution, starting from an initial state asymptotically approaching thestring perturbative vacuum.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

From pre- to post-big bang: an (almost) self-dual cosmological history