Cosmological dynamics in spin-foam loop quantum cosmology: challenges and prospects
arXiv:1612.08800 · doi:10.1088/1361-6382/aa601d
Abstract
We explore the structure of the spin foam-like vertex expansion in loop quantum cosmology and discuss properties of the corresponding amplitudes, with the aim of elucidating some of the expansion's useful properties and features. We find that the expansion is best suited for consideration of conceptual questions and for investigating short-time, highly quantum behavior. In order to study dynamics at cosmological scales, the expansion must be carried to very high order, limiting its direct utility as a calculational tool for such questions. Conversely, it is unclear that the expansion can be truncated at finite order in a controlled manner.
16 pages, 3 figures. Invited contribution to journal special issue on cosmological applications of loop quantum gravity. Version 2: minor corrections and updated references. Matches published version
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