Late Time Acceleration of the Universe from Quantum Gravity

We show that the accelerating expansion phase of the universe can emerge from the group field theory formalism, a candidate theory of quantum gravity. The cosmological evolution can be extracted from condensate states using the mean field approximation, in a form of modified FLRW equations. By intro...

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Bibliographic Details
Main Author: Xiankai Pang
Format: Article
Language:English
Published: MDPI AG 2022-03-01
Series:Universe
Subjects:
Online Access:https://www.mdpi.com/2218-1997/8/3/163
Description
Summary:We show that the accelerating expansion phase of the universe can emerge from the group field theory formalism, a candidate theory of quantum gravity. The cosmological evolution can be extracted from condensate states using the mean field approximation, in a form of modified FLRW equations. By introducing an effective equation of state <i>w</i>, we can reveal the relevant features of the evolution and show that, with the proper choice of the parameters, <i>w</i> will approach <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>−</mo><mn>1</mn></mrow></semantics></math></inline-formula>, leading to an accelerating phase dominated by the cosmological constant effectively.
ISSN:2218-1997