On the gauge invariance of cosmological gravitational waves
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DOI: 10.1088/1475-7516/2020/03/014
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 about the gauge invariance in… read more here.
Keywords: gauge invariance; invariance cosmological; gravitational waves; cosmology ... See more keywords