On the gauge invariance of cosmological gravitational waves

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Published 4 March 2020 © 2020 IOP Publishing Ltd and Sissa Medialab
, , Citation V. De Luca et al JCAP03(2020)014 DOI 10.1088/1475-7516/2020/03/014

1475-7516/2020/03/014

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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10.1088/1475-7516/2020/03/014