Computer Science – Sound
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..595w&link_type=abstract
(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo
Computer Science
Sound
3
Cosmology, Dark Matter, Radiation Measurement, Relic Radiation, Anisotropic Media, Balloon Sounding, Bolometers, Mass Distribution, Perturbation
Scientific paper
Absolute flux measurements of the 2.7K background radiation show a blackbody spectrum with good accuracy over two orders of magnitude of wavelength (12 cm to 1 mm). This is in agreement with the thermal history of matter and radiation envisaged by the hot Big Bang model. The extreme isotropy of the 2.7K radiation on small angular scales (10arcsec to 1°) sets interesting limits on models for the formation of mass structure. Some types of perturbations can be ruled out because the accompanying spatial fluctuations in radiation temperature are not seen (ΔT/T ≤ 10-4). Large-scale (1 - 90°) anisotropy of the radiation is plausible because at the time of decoupling (z ≈ 1000), regions separated by more than a few degrees in the sky were not in causal contact. Explanation of the observed isotropy is a major feature of inflationary models.
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