Microwave Background Anisotropy Induced by Gravitational Waves
Abstract
A cosmological background of gravitational waves induces redshift perturbations in light traversing it. We present calculations of this SachsWolfe effect on the microwave background in an {OMEGA} = 1 Friedmann universe as a function of angular scale and gravitational wave spectrum. Blurriness of the lastscattering surface can cause nonnegligible dilution of the anisotropy for wavelengths less than ~100 Mpc. The limit implied for the energy density of the gravitational waves is approximately d{OMEGA}_GW_/d ln λ <= 10^9^<[{DELTA}T/T)/10^5^]^2^>. We also point out a difficulty in associating a linear scale with an angular anisotropy, due to the clumpiness of the universe.
 Publication:

The Astrophysical Journal
 Pub Date:
 March 1988
 DOI:
 10.1086/166113
 Bibcode:
 1988ApJ...326..517L
 Keywords:

 Anisotropy;
 Cosmology;
 Gravitational Waves;
 Red Shift;
 Relic Radiation;
 Angular Correlation;
 Radiation Spectra;
 Wave Scattering;
 Astrophysics;
 COSMIC BACKGROUND RADIATION;
 GRAVITATION;
 WAVE MOTIONS