Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/03/014
Keywords
gravitational waves / theory; primordial gravitational waves (theory); primordial black holes
Funding
- Swiss National Science Foundation (SNSF) [200020-178787]
- EDEIL-NTUA project [67108600]
- Swiss National Science Foundation (SNF) [200020_178787] Funding Source: Swiss National Science Foundation (SNF)
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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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