Unconventional Cosmology

Details Unconventional Cosmology Unconventional Cosmology

2012-03-30

arxiv.org/abs/1203.6698v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

45 pages, 10 figures; invited lectures at the 6th Aegean Summer School "Quantum Gravity and Quantum Cosmology", Chora, Naxos,

Scientific paper

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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