The issue of the gauge invariance of gravitational waves arises if they are produced in the early universe at second-order in perturbation theory. We address it by dividing the discussion in three parts: The production of gravitational waves, their propagation in the real universe, and their measurement.
On the gauge invariance of cosmological gravitational waves
Franciolini G.;Riotto A.
2020
Abstract
The issue of the gauge invariance of gravitational waves arises if they are produced in the early universe at second-order in perturbation theory. We address it by dividing the discussion in three parts: The production of gravitational waves, their propagation in the real universe, and their measurement.
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