A dipole moment of the microwave background as a cosmological effect

Details A dipole moment of the microwave background as a cosmological effect A dipole moment of the microwave background as a cosmological effect

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..341p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 341-348. Research supported by the Israel Academy of

Mathematics

Logic

51

Background Radiation, Dipole Moments, Gravitational Lenses, Microwaves, Supernovae, Astronomical Models, Cosmology, Curvature, Doppler Effect, Entropy

Scientific paper

A spherically symmetrical Tolman-Bondi cosmological model is presented in which the curvature of space and the entropy variety with distance from the center. The dipole and quadrupole moments in the distribution of the microwave background radiation are calculated as a function of cosmic time and position of an observer, assuming that the distance to the horizon is much smaller than any characteristic scale in the model. The quadrupole moment is found to be affected mostly by the gradient in the curvature of space while the dipole moment is dominated by the gradient of entropy. The results indicate that the observed dipole in the microwave background may be cosmological in origin. Observational tests of this argument are suggested.

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