Improved limits on small-scale anisotropy in cosmic microwave background

Details Improved limits on small-scale anisotropy in cosmic microwave background Improved limits on small-scale anisotropy in cosmic microwave background

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.312..427u&link_type=abstract

Nature (ISSN 0028-0836), vol. 312, Nov. 29, 1984, p. 427-429. NSF-supported research.

Mathematics

Logic

83

Anisotropy, Background Radiation, Cosmic Rays, Relic Radiation, Cosmology, Microwaves, Noise Spectra, Normal Density Functions, Scatter Propagation, Telescopes

Scientific paper

Although efforts to detect small scale structure in the cosmic microwave background radiation have thus far proved unsuccessful, upper limits set on possible underlying fluctuations restrict the range of physical models for perturbations of the density in the early universe. The presently reported search for small scale anisotropy in the background radiation has yielded a lowering of the upper limit on rms fluctuations, or Delta-T(rms) observed at an angular scale of about 4 arcmin, to Delta-T(rms)/T of less than 0.000021 at the 95-percent confidence level; where T = 2.7 K, the temperature of the background radiation. The actual limits deduced from the present experiment depend on the model that is assumed for the unseen fluctuations. Attention is given to the implications of this new measurement for various cosmological models.

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