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.
Designing Cyclic Universe Models
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abstract
Recent advances in understanding the propagation of perturbations through the transition from big crunch to big bang (esp. Tolley et al. hep-th/0306109) make it possible for the first time to consider the full set of phenomenological constraints on the scalar field potential in cyclic models of the universe. We show that cyclic models require a comparable degree of tuning to that needed for inflationary models. The constraints are reduced to a set of simple design rules including "fast-roll" parameters analogous to the "slow-roll" parameters in inflation.
fields
gr-qc 1years
2024 1verdicts
REJECT 1representative citing papers
citing papers explorer
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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.