Improved limits on the tensor-to-scalar ratio using BICEP and Planck
By M. Tristram, A. Banday, K. M. G'orski, Reijo Keskitalo, Charles R. Lawrence, K. J. Andersen, Rita Belén Barreiro, J. Borrill, L. Colombo, H. Eriksen and 7 more. 2021
229 citations recorded by the source corpus.
We present constraints on the tensor-to-scalar ratio r using a combination of BICEP/Keck 2018 and Planck PR4 data allowing us to fit for r consistently with the six parameters of the $\Lambda$CDM model without fixing any of them. In particular, we are able to derive a constraint on the reionization optical depth $\tau$ and thus propagate its uncertainty onto the posterior distribution for r. While Planck sensitivity to r is no longer comparable with ground-based measurements, combining Planck with BK18 and BAO gives results consistent with r = 0 and tightens the constraint to r<0.032.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/47e6312c54b68bb33d754a751964820c61d7c6a6
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Citations in the corpus
- Cosmological parameters derived from the final Planck data release (PR4) (2023, methodology): “…dominate polarization at large scales for the low-(cid:96) likelihood, namely, the LOw-(cid:96) LIkelihood on POlarized Power spectra ( LoLLiPoP ), we have made use of component-separated CMB maps processed by Commander using the whole range of Planck polarized frequencies from 30 to 353 GHz.”
- New physics from the polarized light of the cosmic microwave background (2022, background): “The tensor mode is yet to be discovered 21,22,66,160 .”