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- W2017455795 abstract "In recent years several approaches to quantum gravity have found evidence for a scale dependent spectral dimension of space-time varying from four at large scales to two at small scales of order of the Planck length. The first evidence came from numerical results on four-dimensional causal dynamical triangulations (CDT) [Ambjorn et al., Phys. Rev. Lett. 95 (2005) 171]. Since then little progress has been made in analytically understanding the numerical results coming from the CDT approach and showing that they remain valid when taking the continuum limit. Here we argue that the spectral dimension can be determined from a model with fewer degrees of freedom obtained from the CDTs by radial reduction. In the resulting toy model we can take the continuum limit analytically and obtain a scale dependent spectral dimension varying from four to two with scale and having functional behaviour exactly of the form which was conjectured on the basis of the numerical results." @default.
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- W2017455795 date "2012-10-10" @default.
- W2017455795 modified "2023-10-14" @default.
- W2017455795 title "Dynamical dimensional reduction in toy models of 4D causal quantum gravity" @default.
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- W2017455795 doi "https://doi.org/10.1103/physrevd.86.081503" @default.
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