Alternatives to Cosmological Inflation

Published 27 Feb 2009 in hep-th, astro-ph.CO, gr-qc, and hep-ph | (0902.4731v1)

Abstract: The inflationary paradigm, although very successful phenomenologically, suffers from several conceptual problems which motivate the search for alternative scenarios of early universe cosmology. Here, two possible alternatives will be reviewed. - "string gas cosmology" and the "matter bounce". Their successes and problems will be pointed out.

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