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Constraints on Cosmology from the Cosmic Microwave Background Power Spectrum of the 2500-square degree SPT-SZ Survey | | Z. Hou
; C. L. Reichardt
; K. T. Story
; B. Follin
; R. Keisler
; K. A. Aird
; B. A. Benson
; L. E. Bleem
; J. E. Carlstrom
; C. L. Chang
; H-M. Cho
; T. M. Crawford
; A. T. Crites
; T. de Haan
; R. de Putter
; M. A. Dobbs
; S. Dodelson
; J. Dudley
; E. M. George
; N. W. Halverson
; G. P. Holder
; W. L. Holzapfel
; S. Hoover
; J. D. Hrubes
; M. Joy
; L. Knox
; A. T. Lee
; E. M. Leitch
; M. Lueker
; D. Luong-Van
; J. J. McMahon
; J. Mehl
; S. S. Meyer
; M. Millea
; J. J. Mohr
; T. E. Montroy
; S. Padin
; T. Plagge
; C. Pryke
; J. E. Ruhl
; J.T. Sayre
; K. K. Schaffer
; L. Shaw
; E. Shirokoff
; H. G. Spieler
; Z. Staniszewski
; A. A. Stark
; A. van Engelen
; K. Vanderlinde
; J. D. Vieira
; R. Williamson
; O. Zahn
; | | Date: |
26 Dec 2012 | | Abstract: | We explore extensions to the standard LCDM cosmological model using new
measurements of the cosmic microwave background (CMB) from the South Pole
Telescope (SPT). Adding SPT measurements to WMAP7 significantly improves
constraints on possible extensions to the LCDM model; the addition of
low-redshift measurements of H0 and BAO leads to further improvements. Before
combining these datasets, we check for consistency in the LCDM model between
measurements of the CMB (SPT+WMAP7), H0 and BAO, and find evidence for some
tension between the datasets. Within the CMB data alone, we find only weak
support for physics beyond the LCDM model due to a slight trend of decreasing
power at smaller angular scales, relative to the prediction of the LCDM model.
This trend could be due to a logarithmic scale dependence of the power-law
index of the primordial power spectrum, nrun. Alternatively, the trend could
arise either from adjustments at small or large scales. The power at small
scales is sensitive to the damping scale which is influenced by both the helium
abundance, Yp and the effective number of neutrino species, Neff. The power at
large scales is affected by the ISW effect which is sensitive to the sum of
neutrino masses, mnu. These extensions have similar observational consequences
and are partially degenerate when considered simultaneously. These degeneracies
can weaken or enhance the apparent deviation of any single extension from the
LCDM model. Of the 6 one-parameter model extensions considered, we find the CMB
data to have the largest statistical preference for running within [-0.046,
-0.003] at 95% confidence...[abridged] | | Source: | arXiv, 1212.6267 | | Services: | Forum | Review | PDF | Favorites | |
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