Classical and quantum cosmology of the little rip abrupt event
TLDR
In this article, the authors analyzed the behavior of the universe close to a little rip, which can be interpreted as a big rip sent towards the infinite future, and showed that the little rip can be avoided in the sense of the DeWitt criterion, that is, by having a vanishing wave function at the place of the little-rip.Abstract:
We analyze from a classical and quantum point of view the behavior of the universe close to a little rip, which can be interpreted as a big rip sent towards the infinite future. Like a big rip singularity, a little rip implies the destruction of all bounded structure in the Universe and is thus an event where quantum effects could be important. We present here a new phantom scalar field model for the little rip. The quantum analysis is performed in quantum geometrodynamics, with the Wheeler-DeWitt equation as its central equation. We find that the little rip can be avoided in the sense of the DeWitt criterion, that is, by having a vanishing wave function at the place of the little rip. Therefore our analysis completes the answer to the question: can quantum cosmology smoothen or avoid the divergent behavior genuinely caused by phantom matter? We show that this can indeed happen for the little rip, similar to the avoidance of a big rip and a little sibling of the big rip.read more
Citations
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Cosmological constraints of phantom dark energy models
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Singularity avoidance for collapsing quantum dust in the Lemaître-Tolman-Bondi model
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TL;DR: In this paper, the authors investigated the fate of the classical singularity in a collapsing dust cloud and showed that the collapse to a singularity is replaced by a bounce followed by an expansion.
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Cosmological perturbations in an effective and genuinely phantom dark energy Universe
TL;DR: In this paper, the authors carried out an analysis of the cosmological perturbations in general relativity for three different models which are good candidates to describe the current acceleration of the Universe.
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Singularity avoidance in Bianchi I quantum cosmology
TL;DR: In this article, the authors extend recent discussions of singularity avoidance in quantum gravity from isotropic to anisotropic cosmological models and find that the classical singularities can generally be avoided in these models.
References
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Book
Dark Energy: Theory and Observations
Luca Amendola,Shinji Tsujikawa +1 more
TL;DR: In this article, the authors introduce the concept of dark energy as a modified form of matter in the form of a modified quintessence and show that dark energy is a modification of gravity.
Book
Quantum Cosmology - The Supersymmetric Perspective - Vol. 1: Fundamentals
TL;DR: The two volumes that comprise Quantum Cosmology tackled the quantum description of the early universe from the perspective of supersymmetric models of elementary particle physics, providing readers with the tools they need to go on their own, pushing them to ask the right questions rather than seek definitive answers.