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- W2793698889 abstract "We review connections between the metric of spacetime and the quantum fluctuations of fields. In particular, we discuss the finding that the spacetime metric can be expressed entirely in terms of the 2-point correlators of the fluctuations of quantum fields. We also discuss the open question whether the knowledge of only the spectra of the quantum fluctuations of fields suffices to determine the spacetime metric. This question is of interest because spectra are geometric invariants and their quantization would, therefore, have the benefit of not requiring the modding out of the diffeomorphism group. Further, we discuss the fact that spacetime at the Planck scale need not necessarily be either discrete or continuous. Instead, results from information theory show that spacetime may be simultaneously discrete and continuous in the same way that information can. Finally, we review the finding that a covariant natural ultraviolet cutoff at the Planck scale implies a signature in the cosmic microwave background (CMB) that may become observable." @default.
- W2793698889 created "2018-03-29" @default.
- W2793698889 creator A5056197087 @default.
- W2793698889 date "2018-04-05" @default.
- W2793698889 modified "2023-09-26" @default.
- W2793698889 title "Quantum Gravity, Information Theory and the CMB" @default.
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- W2793698889 doi "https://doi.org/10.1007/s10701-018-0163-2" @default.
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