Ellis, George F.R. and Platts, Emma and Sloan, David and Weltman, Amanda (2016) Current observations with a decaying cosmological constant allow for chaotic cyclic cosmology. Journal of Cosmology and Astroparticle Physics, 2016 (04). p. 26. ISSN 1475-7516
Full text not available from this repository.Abstract
We use the phase plane analysis technique of Madsen and Ellis [1] to consider a universe with a true cosmological constant as well as a cosmological “constant” that is decaying. Time symmetric dynamics for the inflationary era allows eternally bouncing models to occur. Allowing for scalar field dynamic evolution, we find that if dark energy decays in the future, chaotic cyclic universes exist provided the spatial curvature is positive. This is particularly interesting in light of current observations which do not yet rule out either closed universes or possible evolution of the cosmological constant. We present only a proof of principle, with no definite claim on the physical mechanism required for the present dark energy to decay.