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Anisotropies of Gravitational Wave Backgrounds: A Line Of Sight Approach · Around

2016

Anisotropies of Gravitational Wave Backgrounds: A Line Of Sight Approach

Contaldi, Carlo R.

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In the weak field regime, gravitational waves can be considered as being made up of collisionless, relativistic tensor modes that travel along null geodesics of the perturbed background metric.

We work in this geometric optics picture to calculate the anisotropies in gravitational wave backgrounds resulting from astrophysical and cosmological sources.
Our formalism yields expressions for the angular power spectrum of the anisotropies.
We show how the anisotropies are sourced by intrinsic, Doppler, Sachs-Wolfe, and Integrated Sachs-Wolfe terms in analogy with Cosmic Microwave Background photons.

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