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Unconventional Cosmology (1203.6698v1)
Published 30 Mar 2012 in astro-ph.CO, gr-qc, hep-ph, and hep-th
Abstract: I review two cosmological paradigms which are alternative to the current inflationary scenario. The first alternative is the "matter bounce", a non-singular bouncing cosmology with a matter-dominated phase of contraction. The second is an "emergent" scenario, which can be implemented in the context of "string gas cosmology". I will compare these scenarios with the inflationary one and demonstrate that all three lead to an approximately scale-invariant spectrum of cosmological perturbations.
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