Mixed Boundary Conditions in Euclidean Quantum Gravity
arXiv:gr-qc/9506092 · doi:10.1088/0264-9381/12/11/004
Abstract
This paper studies a new set of mixed boundary conditions in Euclidean quantum gravity. These involve, in particular, Robin boundary conditions on the perturbed 3-metric and hence lead, by gauge invariance, to Robin conditions on the whole ghost 1-form. The corresponding trace anomaly is evaluated in the case of flat Euclidean 4-space bounded by a 3-sphere. In general, this anomaly differs from the ones resulting from other local or non-local boundary conditions studied in the recent literature.
17 pages, plain-tex
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