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Loop Quantum Cosmology, Modified Gravity and Extra Dimensions

Department of Physics, South China University of Technology, Guangzhou 510641, China
Academic Editor: Jaume Haro
Universe 2016, 2(3), 15;
Received: 24 May 2016 / Revised: 24 July 2016 / Accepted: 2 August 2016 / Published: 10 August 2016
(This article belongs to the Special Issue Loop Quantum Cosmology and Quantum Black Holes)
PDF [283 KB, uploaded 10 August 2016]


Loop quantum cosmology (LQC) is a framework of quantum cosmology based on the quantization of symmetry reduced models following the quantization techniques of loop quantum gravity (LQG). This paper is devoted to reviewing LQC as well as its various extensions including modified gravity and higher dimensions. For simplicity considerations, we mainly focus on the effective theory, which captures main quantum corrections at the cosmological level. We set up the basic structure of Brans–Dicke (BD) and higher dimensional LQC. The effective dynamical equations of these theories are also obtained, which lay a foundation for the future phenomenological investigations to probe possible quantum gravity effects in cosmology. Some outlooks and future extensions are also discussed. View Full-Text
Keywords: loop quantum cosmology; singularity resolution; effective equation loop quantum cosmology; singularity resolution; effective equation
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 (CC BY 4.0).

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Zhang, X. Loop Quantum Cosmology, Modified Gravity and Extra Dimensions. Universe 2016, 2, 15.

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