Observational exclusion of a consistent quantum cosmological scenario

Abstract : 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 \textit{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 \textit{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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Submitted on : Wednesday, November 4, 2015 - 9:05:54 AM
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B. Bolliet, A. Barrau, J. Grain, S. Schander. Observational exclusion of a consistent quantum cosmological scenario. Physical Review D, American Physical Society, 2016, 93, pp.124011 ⟨10.1103/PhysRevD.93.124011⟩. ⟨in2p3-01222467⟩

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