Hot Paper in Physics

February 2015
“Nine-year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Cosmological parameter results,” by G. Hinshaw, et al., Astrophysical J. Suppl. Ser., 208(2): No. 19, October 2013.

Abstract: “We present cosmological parameter constraints based on the final nine-year Wilkinson Microwave Anisotropy Probe (WMAP) data, in conjunction with a number of additional cosmological data sets. The WMAP data alone, and in combination, continue to be remarkably well fit by a six-parameter Delta CDM model. When WMAP data are combined with measurements of the high-l cosmic microwave background anisotropy, the baryon acoustic oscillation scale, and the Hubble constant, the matter and energy densities, Omega(b)h(2), Omega(c)h(2), and Omega(Lambda), are each determined to a precision of similar to 1.5%. The amplitude of the primordial spectrum is measured to within 3%, and there is now evidence for a tilt in the primordial spectrum at the 5 sigma level, confirming the first detection of tilt based on the five-year WMAP data. At the end of the WMAP mission, the nine-year data decrease the allowable volume of the six-dimensional Delta CDM parameter space by a factor of 68,000 relative to pre-WMAP measurements. We investigate a number of data combinations and show that their Delta CDM parameter fits are consistent. New limits on deviations from the six-parameter model are presented, for example: the fractional contribution of tensor modes is limited to r < 0.13 (95% CL); the spatial curvature parameter is limited to Omega(k) = -0.0027(-0.0038)(+0.0039); the summed mass of neutrinos is limited to Sigma m(nu) < 0.44 eV (95% CL); and the number of relativistic species is found to lie within N-eff = 3.84 +/- 0.40, when the full data are analyzed. The joint constraint on N-eff and the primordial helium abundance, Y-He, agrees with the prediction of standard big bang nucleosynthesis. We compare recent Planck measurements of the Sunyaev-Zel'dovich effect with our seven-year measurements, and show their mutual agreement. Our analysis of the polarization pattern around temperature extrema is updated. This confirms a fundamental prediction of the standard cosmological model and provides a striking illustration of acoustic oscillations and adiabatic initial conditions in the early universe.”

This 2013 paper from Astrophysical Journal Supplement Series was cited 56 times in current journal articles indexed by Thomson Reuters during September-October 2014. Only one other non-review paper indexed during the last two years in the main field of Physics (including Space Science) garnered a higher number of citations during that two-month period. Prior to the most recent count, citations to the report have accrued as follows, as tracked by Essential Science Indicators Hot Papers:

July-August 2014: 100 citations
May-June 2014: 73
March-April 2014: 74
January-February 2014: 60
November-December 2013: 50
September-October 2013: 23

Total citations to date: 436

SOURCE: Thomson Reuters Web of Science

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