Higher order modes
A GW signal can be decomposed into several modes by a spherical
harmonic decomposition. Current searches for GWs use templates that
only include the most dominant mode (the quadrupole mode) in
matched filtering. Actual GWs however are “full” signals that
include higher order multipoles. My work is to investigate the
effect of these sub-dominant modes in the detection and parameter
estimation of GWs.
The sub-dominant become more important for high mass-ratios, high
inclination angles and high total mass. We identified regions in
the parameter space (Total mass, mass ratio, spins) of
non-precessing Binary Black holes where neglecting the sub-dominant
modes is expected to result in significant loss of detection rate
and/or significant bias in the estimated parameters of the source.
Here's a quick summary plot. For more information, refer to: