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- W3101644182 abstract "We consider a four-dimensional simplicial complex and the minisuperspace general relativity system on it. The metric is flat in most parts of the interior of every 4-simplex, with the exception of a thin layer of thickness $${propto varepsilon}$$ along each three-dimensional face. In this layer the metric undergoes a jump between the two 4-simplices sharing this face. At $${varepsilon to 0}$$ this jump would become a discontinuity. However, a discontinuity of the metric induced on the face is not allowed in general relativity: terms arise in the Einstein action tending to infinity as $${varepsilon to 0}$$ . In the path integral approach, these terms lead to the pre-exponent factor with δ-functions requiring that the metric induced on the faces be continuous. That is, the 4-simplices fit on their common faces. The other part of the path integral measure corresponds to the action, which is the sum of independent terms over the 4-simplices. Therefore this part of the path integral measure is the product of independent measures over the 4-simplices. The result obtained is in accordance with our previous one obtained from symmetry considerations." @default.
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- W3101644182 date "2011-07-26" @default.
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- W3101644182 title "Gravity action on rapidly varying metrics" @default.
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- W3101644182 doi "https://doi.org/10.1007/s10714-011-1227-1" @default.
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