Fundamental Structure of Loop Quantum Gravity

Details Fundamental Structure of Loop Quantum Gravity Fundamental Structure of Loop Quantum Gravity

2005-09-16

arxiv.org/abs/gr-qc/0509064v5

Int.J.Mod.Phys.D16:1397-1474,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

82 pages, no figures, revised version accepted for publication in IJMPD

Scientific paper

10.1142/S0218271807010894

In this review, the fundamental structure of loop quantum gravity is presented pedagogically. Our main aim is to help non-experts to understand the motivations, basic structures, as well as general results. It may also be beneficial to practitioners to gain insights from different perspectives on the theory. We will focus on the theoretical framework itself, rather than its applications, and do our best to write it in modern and precise langauge while keeping the presentation accessible for beginners. After reviewing the classical connection dynamical formalism of general relativity, as a foundation, the construction of kinematical Ashtekar-Isham-Lewandowski representation is introduced in the content of quantum kinematics. The algebraic structure of quantum kinematics is also discussed. In the content of quantum dynamics, we mainly introduce the construction of a Hamiltonian constraint operator and the master constraint project. At last, some applications and recent advances are outlined. It should be noted that this strategy of quantizing gravity can also be extended to obtain other background independent quantum gauge theories. There is no divergence within this background independent and diffeomorphism invariant quantization programme of matter coupled to gravity.

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