Gravitational lensing on the Cosmic Microwave Background by gravity waves

Details Gravitational lensing on the Cosmic Microwave Background by gravity waves Gravitational lensing on the Cosmic Microwave Background by gravity waves

1997-08-21

arxiv.org/abs/astro-ph/9708196v1

Phys.Rev. D57 (1998) 1303-1305

Astronomy and Astrophysics

Astrophysics

6 pages, RevTeX file, 1 figure

Scientific paper

10.1103/PhysRevD.57.1303

We study the effect of a stochastic background of gravitational waves on the gravitational lensing of the Cosmic Microwave Background (CMB) radiation. It has been shown that matter density inhomogeneities produce a smoothing of the acoustic peaks in the angular power spectrum of the CMB anisotropies. A gravitational wave background gives rise to an additional smoothing of the spectrum. For the most simple case of a gravitational wave background arising during a period of inflation, the effect results to be three to four orders of magnitude smaller than its scalar counterpart, and is thus undetectable. It could play a more relevant role in models where a larger background of gravitational waves is produced.

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