期刊
CLASSICAL AND QUANTUM GRAVITY
卷 28, 期 14, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/28/14/145028
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资金
- NSF [PHY0854743]
- George A and Margaret M Downsbrough Endowment
- Eberly research funds of Penn State
- Fondazione Angelo della Riccia
We consider spinfoam quantum gravity. We show in a simple case that the amplitude projects over a nontrivial (curved) classical geometry. This suggests that, at least for spinfoams without bubbles and for large values of the boundary spins, the amplitude takes the form of a path integral over Regge metrics, thus enforcing discrete Einstein equations in the classical limit. The result relies crucially on a new interpretation of the semiclassical limit for the amplitudes truncated to a fixed 2-complex.
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