PIRSA Logo


PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Nonlinear memory in numerical waveforms
Speaker(s): Denis Pollney
Abstract: In addition to the dominant oscillatory modes gravitational waves contain non-oscillatory components which arise as drifts or offsets in the signals. Nonlinear gravitational memory arises from a change in mass multipole moments of a boundsystem due to contributions from the emitted gravitationalwaves. In practice it appears as a slowly monotonically growingsignal during the inspiral which sees a rapid rise at thetime of merger. The low amplitude and non-oscillatory natureof these signals present unique challenges for modeling.I discuss recent efforts to evaluate these signals in numericalsimulations using characteristic extraction as well as theirpotential relevance to detection.
Date: 26/06/2010 - 11:50 am
Valid XHTML 1.0!