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Advances in High Energy Physics
Volume 2017 (2017), Article ID 4015145, 5 pages
https://doi.org/10.1155/2017/4015145
Research Article

Big Bang as a Critical Point

Institute of Physics, Jagiellonian University, Ul. Łojasiewicza 11, 30-348 Kraków, Poland

Correspondence should be addressed to Jakub Mielczarek; lp.ude.ju@kerazcleim.bukaj

Received 12 May 2017; Accepted 4 July 2017; Published 22 August 2017

Academic Editor: Jerzy Kowalski-Glikman

Copyright © 2017 Jakub Mielczarek. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.

Abstract

This article addresses the issue of possible gravitational phase transitions in the early universe. We suggest that a second-order phase transition observed in the Causal Dynamical Triangulations approach to quantum gravity may have a cosmological relevance. The phase transition interpolates between a nongeometric crumpled phase of gravity and an extended phase with classical properties. Transition of this kind has been postulated earlier in the context of geometrogenesis in the Quantum Graphity approach to quantum gravity. We show that critical behavior may also be associated with a signature change in Loop Quantum Cosmology, which occurs as a result of quantum deformation of the hypersurface deformation algebra. In the considered cases, classical space-time originates at the critical point associated with a second-order phase transition. Relation between the gravitational phase transitions and the corresponding change of symmetry is underlined.