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.
CITATION STYLE
Brandenberger, R. H. (2013). Unconventional cosmology. In Springer Proceedings in Mathematics and Statistics (Vol. 863, pp. 333–374). Springer New York LLC. https://doi.org/10.1007/978-3-642-33036-0_12
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