Microwave background anisotropy induced by gravitational waves

Details Microwave background anisotropy induced by gravitational waves Microwave background anisotropy induced by gravitational waves

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..517l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 517-526.

Mathematics

Logic

23

Anisotropy, Cosmology, Gravitational Waves, Red Shift, Relic Radiation, Angular Correlation, Radiation Spectra, Wave Scattering

Scientific paper

A cosmological background of gravitational waves induces redshift perturbations in light transversing it. Calculations of this Sachs-Wolfe effect on the microwave background are presented in an Omega = 1 Friedmann universe as a function of angular scale and gravitational wave spectrum. Blurriness of the last-scattering surface can cause nonnegligible dilution of the anisotropy for wavelengths less than about 100 Mpc. The limit implied for the energy density of the gravitational waves is given. A difficulty in associating a linear scale with an angular anisotropy, due to the clumpiness of the universe, is also pointed out.

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