Loop quantum gravity: an outside view

Nicolai, Hermann; Peeters, Kasper; Zamaklar, Marija

doi:10.1088/0264-9381/22/19/R01

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Loop quantum gravity: an outside view

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Nicolai, Hermann
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

Peeters, Kasper
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

Zamaklar, Marija
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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207109.pdf
(出版社版), 570KB

0501114.pdf
(プレプリント), 616KB

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引用

Nicolai, H., Peeters, K., & Zamaklar, M. (2005). Loop quantum gravity: an outside view. Classical and Quantum Gravity, 22, R193-R247. doi:10.1088/0264-9381/22/19/R01.

引用: https://hdl.handle.net/11858/00-001M-0000-0013-4EAC-A

要旨

We review aspects of loop quantum gravity in a pedagogical manner, with the aim of enabling a precise but critical assessment of its achievements so far. We emphasize that the off-shell ('strong') closure of the constraint algebra is a crucial test of quantum spacetime covariance, and thereby of the consistency, of the theory. Special attention is paid to the appearance of a large number of ambiguities, in particular in the formulation of the Hamiltonian constraint. Developing suitable approximation methods to establish a connection with classical gravity on the one hand, and with the physics of elementary particles on the other, remains a major challenge.