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Quantum cosmological gravitational waves?
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General relativity and its cosmological solution predicts the existence of tensor modes of perturbations evolving on top of our Friedman-Lema\^itre-Robertson-Walker expanding Universe. Being gauge invariant and not necessarily coupled to other quantum sources, they can be seen as representing pure gravity. Unambiguously showing they are indeed to be quantised would thus provide an unquestionable proof of the quantum nature of gravitation. This review will present a summary of the various theoretical issues that could lead to this conclusion.
Forward citations
Cited by 3 Pith papers
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When the Environment Speaks: Quantum Signatures in Non-Attractor Inflation
An open quantum system treatment of curvature perturbations during Ultra-Slow-Roll inflation shows that environmental decoherence erases the interference dip, modifies the growth slope, and induces oscillatory feature...
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A Landscape of Cosmological Decoherence
Requiring decohered cosmological perturbations to admit a classical P-function forces their momentum variance above the vacuum value, and demanding a linear gravitational potential at reheating bounds that variance by...
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Decoherence Effects on Primordial Black Holes and Scalar-Induced Gravitational Waves
Decoherence of PBH-producing modes, modeled as a Gaussian loss channel, yields a covariance-survival factor Q_dec that suppresses SIGW spectra by ~Q_dec^{2} for narrow peaks while exponentially affecting PBH abundance...
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