Information Gain on Reheating: the One Bit Milestone

Ringeval, Christophe;et.al.
(2016) Physical review. D, Particles and fields — Vol. D93, p. 103532 (2016)

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We show that the Planck 2015 and BICEP2/KECK measurements of the Cosmic Microwave Background (CMB) anisotropies provide together an information gain of 0.82 +- 0.13 bits on the reheating history over all slow-roll single-field models of inflation. This corresponds to a 40% improvement compared to the Planck 2013 constraints on the reheating. Our method relies on an exhaustive CMB data analysis performed over nearly 200 models of inflation to derive the Kullback-Leibler entropy between the prior and the fully marginalized posterior of the reheating parameter. This number is a weighted average by the Bayesian evidence of each model to explain the data thereby ensuring its fairness and robustness.
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Ringeval, C., & et al. (2016). Information Gain on Reheating: the One Bit Milestone. Physical review. D, Particles and fields, D93, 103532. https://doi.org/10.1103/PhysRevD.93.103532 (Original work published 2016)