Journal
PHYSICAL REVIEW D
Volume 81, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.021302
Keywords
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Funding
- European Commission [MIRG-CT-2007-203314]
- STFC
- Leverhulme Trust
- MICINN [AYA2008-03531, FP7-IDEAS-Phys. LSS 240117]
- IoA Cambridge
- Higher Education Funding Council for England
- NASA Office of Space Science
- STFC [PP/E004121/1, PP/E004121/2] Funding Source: UKRI
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [PP/E004121/1, PP/E004121/2] Funding Source: researchfish
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We present a minimally parametric reconstruction of the primordial power spectrum using the most recent cosmic microwave background and large-scale structure data sets. Our goal is to constrain the shape of the power spectrum while simultaneously avoiding strong theoretical priors and over-fitting of the data. We find no evidence for any departure from a power-law spectral index. We also find that an exact scale-invariant power spectrum is disfavored by the data, but this conclusion is weaker than the corresponding result assuming a theoretically-motivated power-law spectral index prior. The reconstruction shows that better data are crucial to justify the adoption of such a strong theoretical prior observationally. These results can be used to determine the robustness of our present knowledge when compared with forthcoming precision data from Planck.
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