期刊
PHYSICAL REVIEW D
卷 89, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.023511
关键词
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资金
- Alexander von Humboldt Foundation
- Trans-Regional Collaborative Research Center TRR 33-The Dark Universe of the Deutsche Forschungsgemeinschaft (DFG)
- STFC [ST/I001204/1]
- European Research Council under the European Union [202686-MDEPUGS]
- University of Portsmouth
- Alfred P. Sloan Foundation
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- University of Cambridge
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- National Science Foundation
- US Department of Energy Office of Science
- STFC [ST/K00090X/1, ST/I001204/1, ST/L005573/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001204/1, ST/K00090X/1, ST/L005573/1] Funding Source: researchfish
We present the strongest robust constraints on primordial non-Gaussianity (PNG) from currently available galaxy surveys, combining large-scale clustering measurements and their cross correlations with the cosmic microwave background. We update the data sets used by Giannantonio et al. (2012), and broaden that analysis to include the full set of two-point correlation functions between all surveys. In order to obtain the most reliable constraints on PNG, we advocate the use of the cross correlations between the catalogs as a robust estimator and we perform an extended analysis of the possible systematics to reduce their impact on the results. To minimize the impact of stellar contamination in our luminous red galaxy sample, we use the recent Baryon Oscillations Spectroscopic Survey catalog of Ross et al. (2011). We also find evidence for a new systematic in the NVSS radio galaxy survey similar to, but smaller than, the known declination-dependent issue; this is difficult to remove without affecting the inferred PNG signal, and thus we do not include the NVSS autocorrelation function in our analyses. We find no evidence of primordial non-Gaussianity; for the local-type configuration we obtain for the skewness parameter -36 < f(NL) < 45 at 95% C.L. (5 +/- 21 at 1 sigma) when using the most conservative part of our data set, improving previous results; we also find no evidence for significant kurtosis, parameterized by g(NL). In addition to PNG, we simultaneously constrain dark energy and find that it is required with a form consistent with a cosmological constant.
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