Speaker
Description
The study of Emergent Universe models (EU) is based on the assumption that the universe emerges from a past eternal Einstein static state (ES) towards an inflationary phase. The EU is an attractive scenario since it avoids the initial singularity and provides a smooth transition towards an inflationary period.
In this context, it has been pointed out by Mithani-Vilenkin that certain Emergent Universe scenarios which have a classically stable ES could present a semiclassically instability and collapse.
In this work, presented in arXiv:2108.09524, we study the classical and quantum stability of the ES regime of Emergent Universes in the context of a Jordan-Brans-Dicke theory. In particular, we show that when considering these models it is possible to have in the past both, classical and semiclassically stability without taking into account the instability pointed out by Mithani-Vilenkin.
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