Cosmological implications of the CMB largescale structure
The Wilkinson Microwave Anisotropy Probe (WMAP) and Planck may have uncovered several anomalies in the full cosmic microwave background (CMB) sky that could indicate possible new physics driving the growth of density fluctuations in the early universe. These include an unusually low power at the largest scales and an apparent alignment of the quadrupole and octopole moments. In a ΛCDM model where the CMB is described by a Gaussian Random Field, the quadrupole and octopole moments should be statistically independent. The emergence of these low probability features may simply be due to posterior selections from many such possible effects, whose occurrence would therefore not be as unlikely as one might naively infer. If this is not the case, however, and if these features are not due to effects such as foreground contamination, their combined statistical significance would be equal to the product of their individual significances. In the absence of such extraneous factors, and ignoring the biasing due to posterior selection, the missing largeangle correlations would have a probability as low as ∼0.1% and the lowl multipole alignment would be unlikely at the ∼4.9% level; under the least favorable conditions, their simultaneous observation in the context of the standard modelmore »
 Authors:

^{[1]}
 Department of Physics, The Applied Math Program, and Department of Astronomy, The University of Arizona, AZ 85721 (United States)
 Publication Date:
 OSTI Identifier:
 22342181
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; BACKGROUND RADIATION; CORRELATIONS; COSMOLOGY; DENSITY; FLUCTUATIONS; GRAVITATION; GROWTH; INFLATIONARY UNIVERSE; PROBABILITY; RANDOMNESS; RECOMBINATION; RELICT RADIATION; STANDARD MODEL; UNIVERSE