Loop quantum gravity: An Outside view

Nicolai, H.; Peeters, K.; Zamaklar, M.

doi:10.1088/0264-9381/22/19/r01

Loop quantum gravity: An Outside view

Nicolai, H.; Peeters, K.; Zamaklar, M.

Authors

H. Nicolai

Dr Kasper Peeters kasper.peeters@durham.ac.uk
Associate Professor

Dr Marija Zamaklar marija.zamaklar@durham.ac.uk
Associate Professor

Abstract

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.

Citation

Nicolai, H., Peeters, K., & Zamaklar, M. (2005). Loop quantum gravity: An Outside view. Classical and Quantum Gravity, 22(19), 193-247. https://doi.org/10.1088/0264-9381/22/19/r01

Journal Article Type	Article
Publication Date	2005-10
Deposit Date	Apr 27, 2007
Journal	Classical and Quantum Gravity
Print ISSN	0264-9381
Electronic ISSN	1361-6382
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	22
Issue	19
Pages	193-247
DOI	https://doi.org/10.1088/0264-9381/22/19/r01