Will COBE challenge the inflationary paradigm? - Cosmic microwave background anisotropies versus large-scale streaming motions revisited

Details Will COBE challenge the inflationary paradigm? - Cosmic microwave background anisotropies versus large-scale streaming motions revisited Will COBE challenge the inflationary paradigm? - Cosmic microwave background anisotropies versus large-scale streaming motions revisited

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l...5g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, March 20, 1991, p. L5-L9.

Astronomy and Astrophysics

Astrophysics

29

Cosmic Background Explorer Satellite, Relic Radiation, Anisotropy, Astronomical Models, Hubble Constant, Power Spectra

Scientific paper

The relation between cosmic microwave background (CMB) anisotropies and large-scale galaxy streaming motions is examined within the framework of inflationary cosmology. The minimal Sachs and Wolfe (1967) CMB anisotropies at large angular scales in the models with initial Harrison-Zel'dovich spectrum of inhomogeneity normalized to the local large-scale bulk flow, which are independent of the Hubble constant and specific nature of dark matter, are found to be within the anticipated ultimate sensitivity limits of COBE's Differential Microwave Radiometer experiment. For example, the most likely value of the quadrupole coefficient is predicted to be a2 not less than 7 x 10 to the -6th, where equality applies to the limiting minimal model. If (1) COBE's DMR instruments perform well throughout the two-year period; (2) the anisotropy data are not marred by the systematic errors; (3) the large-scale motions retain their present observational status; (4) there is no statistical conspiracy in a sense of the measured bulk flow being of untypically high and the large-scale anisotropy of untypically low amplitudes; and (5) the low-order multipoles in the all-sky primordial fireball temperature map are not detected, the inflationary paradigm will have to be questioned.

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