Observational exclusion of a consistent loop quantum cosmology scenario

Bolliet B, Barrau A, Grain J, Schander S (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016


Publisher: American Physical Society

Book Volume: 93

Article Number: 124011

Journal Issue: 12

DOI: 10.1103/PhysRevD.93.124011


It is often argued that inflation erases all the information about what took place before it started. Quantum gravity, relevant in the Planck era, seems therefore mostly impossible to probe with cosmological observations. In general, only very ad hoc scenarios or hyper fine-tuned initial conditions can lead to observationally testable theories. Here we consider a well-defined and well-motivated candidate quantum cosmology model that predicts inflation. Using the most recent observational constraints on the cosmic microwave background B-modes, we show that the model is excluded for all its parameter space, without any tuning. Some important consequences are drawn for the deformed algebra approach to loop quantum cosmology. We emphasize that neither loop quantum cosmology in general nor loop quantum gravity are disfavored by this study but their falsifiability is established.

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Bolliet, B., Barrau, A., Grain, J., & Schander, S. (2016). Observational exclusion of a consistent loop quantum cosmology scenario. Physical Review D, 93(12). https://dx.doi.org/10.1103/PhysRevD.93.124011


Bolliet, Boris, et al. "Observational exclusion of a consistent loop quantum cosmology scenario." Physical Review D 93.12 (2016).

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