Kavli Affiliate: Daniel E. Holz
| First 5 Authors: Kristen Schumacher, Colm Talbot, Daniel E. Holz, Nicolás Yunes,
| Summary:
In some beyond-Einstein theories of gravity, gravitational waves can contain
up to six polarizations, which are allowed to propagate at different speeds
faster than light. These different propagation speeds imply that polarizations
generated by the same source will not arrive simultaneously at the detector.
Current constraints on the speed of propagation of transverse-traceless
polarizations, however, indicate that any additional polarizations must arrive
with or before the transverse-traceless ones. We propose a new technique to
test for the existence of superluminal, non-transverse-traceless polarizations
that arrive in the data before a gravitational-wave observation of
transverse-traceless modes. We discuss the circumstances in which these
non-transverse-traceless polarizations would be detectable and what constraints
could be placed if they are not detected. To determine whether this new test of
general relativity with gravitational wave observations is practical, we
outline and address many of the challenges it might face. Our arguments lead us
to conclude that this new test is not only physically well-motivated but also
feasible with current detectors.
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