In a specific f(Q) gravity model, Einstein static universes with oscillatory stability exist for certain matter equations of state, but the claimed transition to inflation is constructed ad hoc.
Unconventional Cosmology
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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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gr-qc 1years
2024 1verdicts
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Emergent Universe in f(Q) gravity theories
In a specific f(Q) gravity model, Einstein static universes with oscillatory stability exist for certain matter equations of state, but the claimed transition to inflation is constructed ad hoc.