Tensors, BICEP2 results, prior dependence, and dust

Cortes, Marina, Liddle, Andrew R. and Parkinson, David (2015) Tensors, BICEP2 results, prior dependence, and dust. Physical Review D, 92 6: 063511-063511. doi:10.1103/PhysRevD.92.063511

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Author Cortes, Marina
Liddle, Andrew R.
Parkinson, David
Title Tensors, BICEP2 results, prior dependence, and dust
Journal name Physical Review D   Check publisher's open access policy
ISSN 1550-7998
Publication date 2015-09
Year available 2015
Sub-type Article (original research)
DOI 10.1103/PhysRevD.92.063511
Open Access Status File (Publisher version)
Volume 92
Issue 6
Start page 063511
End page 063511
Total pages 10
Place of publication College Park, MD United States
Publisher American Physical Society
Collection year 2016
Language eng
Formatted abstract
We investigate the prior dependence on the inferred spectrum of primordial tensor perturbations, in light of recent results from BICEP2 and taking into account a possible dust contribution to polarized anisotropies. We highlight an optimized parametrization of the tensor power spectrum, and adoption of a logarithmic prior on its amplitude AT, leading to results that transform more evenly under change of pivot scale. In the absence of foregrounds the tension between the results of BICEP2 and Planck drives the tensor spectral index nT to be blue tilted in a joint analysis, which would be in contradiction to the standard inflation prediction (nT<0). When foregrounds are accounted for, the BICEP2 results no longer require nonstandard inflationary parameter regions. We present limits on primordial AT and nT, adopting foreground scenarios put forward by Mortonson and Seljak and motivated by Planck 353 GHz observations, and assess what dust contribution leaves a detectable cosmological signal. We find that if there is sufficient dust for the signal to be compatible with standard inflation, then the primordial signal is too weak to be robustly detected by BICEP2 if Planck+WMAP upper limits from temperature and E-mode polarization are correct.
Keyword Pre Big Bang
Cosmological Parameters
String Cosmology
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 2 times in Scopus Article | Citations
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