期刊
CLASSICAL AND QUANTUM GRAVITY
卷 28, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0264-9381/28/2/025003
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资金
- NSF [PHY0854743]
- George A and Margaret M Downsbrough Endowment
- Eberly research funds of Penn State
- Le Fonds Quebecois de la Recherche sur la Nature et les Technologies
- Edward A and Rosemary A Mebus funds
- Direct For Mathematical & Physical Scien
- Division Of Physics [854743] Funding Source: National Science Foundation
The quantum dynamics of the flat Friedmann-Lemaitre-Robertson-Walker and Bianchi I models defined by loop quantum cosmology have recently been translated into a spinfoam-like formalism. The construction is facilitated by the presence of a massless scalar field which is used as an internal clock. The implicit integration over the matter variable leads to a nonlocal spinfoam amplitude. In this paper we consider a vacuum Bianchi I universe and show that by choosing an appropriate regulator a spinfoam expansion can be obtained without selecting a clock variable and that the resulting spinfoam amplitude is local.
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