Helium production and limits on the anisotropy of the universe

Details Helium production and limits on the anisotropy of the universe Helium production and limits on the anisotropy of the universe

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..777o&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Feb. 1, 1978, p. 777-780.

Astronomy and Astrophysics

Astronomy

15

Background Radiation, Big Bang Cosmology, Helium, Microwave Emission, Nuclear Fusion, Universe, Anisotropy, Astronomical Models, Radiation Measurement, Radio Astronomy

Scientific paper

If most of the presently observed He-4 was synthesized in a primordial big-bang stage of the universe, an indirect method due to Barrow (1976) can be used to set upper limits on the global anisotropy of the universe. Numerical results from an improved version of this method are compared with the more direct limits on anisotropy from observations of the microwave background radiation. Limitations in applicability of the method are also discussed.

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