Some Remarks on the Semi-Classical Limit of Quantum Gravity

Details Some Remarks on the Semi-Classical Limit of Quantum Gravity Some Remarks on the Semi-Classical Limit of Quantum Gravity

2005-01-25

arxiv.org/abs/gr-qc/0501076v1

Braz.J.Phys. 35 (2005) 442-446

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, Proceedings of the Second International Workshop DICE2004 (Castello di Piombino, Tuscany) "From Decoherence and Emerg

Scientific paper

One of the most important issues in quantum gravity is to identify its semi-classical regime. First the issue is to define for we mean by a semi-classical theory of quantum gravity, then we would like to use it to extract physical predictions. Writing an effective theory on a flat background is a way to address this problem and I explain how the non-commutative spacetime of deformed special relativity is the natural arena for such considerations. On the other hand, I discuss how the definition of the semi-classical regime can be formulated in a background independent fashion in terms of quantum information and renormalisation of geometry.

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