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- W3098241628 abstract "We evaluate the spectral dimension in causal set quantum gravity by simulating random walks on causal sets. In contrast to other approaches to quantum gravity, we find an increasing spectral dimension at small scales. This observation can be connected to the non-locality of causal set theory that is deeply rooted in its fundamentally Lorentzian nature. Based on its large-scale behaviour, we conjecture that the spectral dimension can serve as a tool to distinguish causal sets that approximate manifolds from those that do not. As a new tool to probe quantum spacetime in different quantum gravity approaches, we introduce a novel dimensional estimator, the causal spectral dimension, based on the meeting probability of two random walkers, which respect the causal structure of the quantum spacetime. We discuss a causal-set example, where the spectral dimension and the causal spectral dimension differ, due to the existence of a preferred foliation." @default.
- W3098241628 created "2020-11-23" @default.
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- W3098241628 date "2014-05-27" @default.
- W3098241628 modified "2023-10-03" @default.
- W3098241628 title "Spectral dimension in causal set quantum gravity" @default.
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- W3098241628 doi "https://doi.org/10.1088/0264-9381/31/12/125007" @default.
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