Abstract
In any approach to quantum gravity, it is crucial to look for observational effects in order to discriminate between different approaches. Here, we discuss how quantum-gravitational contributions to the anisotropy spectrum of the cosmic microwave background arise in the framework of canonical quantum gravity using the Wheeler–DeWitt equation. From the present non-observation of these contributions, we find a constraint on the Hubble parameter of inflation.
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Acknowledgments
We thank Gianluca Calcagni for useful discussions. M. K. acknowledges support from the Bonn–Cologne Graduate School of Physics and Astronomy.
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Kiefer, C., Krämer, M. (2014). On the Observability of Quantum-Gravitational Effects in the Cosmic Microwave Background. In: Bičák, J., Ledvinka, T. (eds) Relativity and Gravitation. Springer Proceedings in Physics, vol 157. Springer, Cham. https://doi.org/10.1007/978-3-319-06761-2_74
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DOI: https://doi.org/10.1007/978-3-319-06761-2_74
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