About: Loop Quantum Gravity

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described by	proxy:entity/http/relativity.livingreviews.org/register.rdf
Date Issued	2008-07-15
Replaces	Loop Quantum Gravity
Date Submitted	2008-04-28
Abstract	The problem of describing the quantum behavior of gravity, and thus understanding quantum spacetime, is still open. Loop quantum gravity is a well-developed approach to this problem. It is a mathematically well-defined background-independent quantization of general relativity, with its conventional matter couplings. Today research in loop quantum gravity forms a vast area, ranging from mathematical foundations to physical applications. Among the most significant results obtained so far are: (i) The computation of the spectra of geometrical quantities such as area and volume, which yield tentative quantitative predictions for Planck-scale physics. (ii) A physical picture of the microstructure of quantum spacetime, characterized by Planck-scale discreteness. Discreteness emerges as a standard quantum effect from the discrete spectra, and provides a mathematical realization of Wheeler’s “spacetime foam” intuition. (iii) Control of spacetime singularities, such as those in the interior of black holes and the cosmological one. This, in particular, has opened up the possibility of a theoretical investigation into the very early universe and the spacetime regions beyond the Big Bang. (iv) A derivation of the Bekenstein–Hawking black-hole entropy. (v) Low-energy calculations, yielding n-point functions well defined in a background-independent context. The theory is at the roots of, or strictly related to, a number of formalisms that have been developed for describing background-independent quantum field theory, such as spin foams, group field theory, causal spin networks, and others. I give here a general overview of ideas, techniques, results and open problems of this candidate theory of quantum gravity, and a guide to the relevant literature.
Date Accepted	2008-05-31
Description	Substantially rewritten version of the original article. Changes include figures and updated references (increased from 217 to 300).
Title	Loop Quantum Gravity
Creator	http://relativity.livingreviews.org/resources/author#rovelli.carlo
Subject	Quantum gravity, Loop quantum gravity
http://dev.livingr.../terms#adsBibcode	2008LRR....11....5R
http://dev.livingr...ubtk/terms#number	5
http://dev.livingr...pubtk/terms#rscId	lrr-2008-5
http://dev.livingr...btk/terms#rscType	publication
http://dev.livingr...btk/terms#subject	http://relativity.livingreviews.org/resources/subjectField#QuanGR
http://dev.livingr...ubtk/terms#volume	11
is topic of	http://relativity.livingreviews.org/register.rdf
is Has Part of	Living Reviews in Relativity
is Is Replaced By of	Loop Quantum Gravity

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