Kavli Affiliate: Misao Sasaki
| First 5 Authors: Jaume Garriga, Jaume Garriga, , ,
| Summary:
Spectator fields which provide additional tensor degrees of freedom, on top
of the standard metric tensor perturbations, can produce significant amounts of
gravitational waves (GWs). Employing the effective field theory approach for
spin-2 fields, we find a universal prediction that linear mixing between the
metric and extra tensor modes inevitably induces oscillatory features in the GW
spectrum, reminiscent of the so-called neutrino oscillation. Moreover,
parity-violating operators in the spin-2 sector can imprint chiral signatures
on the resulting GW background. We consider a concrete scenario in which the
spin-2 field generates observable chiral GWs with characteristic oscillatory
patterns. These results provide a model-independent characterization of the key
signatures and observational implications of such scenarios which can be
detected with future GW detectors.
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