Quantum gravity: general introduction and recent developments
Abstract
I briefly review the current status of quantum gravity. After giving some general motivations for the need of such a theory, I discuss the main approaches in quantizing general relativity: Covariant approaches (perturbation theory, effective theory, and path integrals) and canonical approaches (quantum geometrodynamics, loop quantum gravity). I then address quantum gravitational aspects of string theory. This is followed by a discussion of black holes and quantum cosmology. I end with some remarks on the observational status of quantum gravity.
 Publication:

Annalen der Physik
 Pub Date:
 January 2006
 DOI:
 10.1002/andp.200510175
 arXiv:
 arXiv:grqc/0508120
 Bibcode:
 2006AnP...518..129K
 Keywords:

 Quantum gravity;
 quantum cosmology;
 loop quantum gravity;
 quantum geometrodynamics;
 string theory;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 21 pages, 6 figures, invited contribution for "Annalen der Physik", v2: minor corrections, additional references