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2014

Gravitational Waves and Scalar Perturbations from Spectator Fields

Biagetti, Matteo, Dimastrogiovanni, Emanuela, Fasiello, Matteo et al.

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The most conventional mechanism for gravitational waves (gw) production during inflation is the amplification of vacuum metric fluctuations.

In this case the gw production can be uniquely related to the inflationary expansion rate $H$.
For example, a gw detection close to the present experimental limit (tensor-to-scalar ratio $r \sim 0.1$) would indicate an inflationary expansion rate close to $10^{14} \, {\rm GeV}$.
This conclusion, however, would be invalid if the observed gw originated from a different source.

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