Gravitationalwave memory effects from binaryblackhole mergers Speaker(s): David Nichols
Abstract:
Over forty detections of binaryblackhole mergers have been made during the first three observing runs of the LIGO and Virgo detectors. With this larger number of measurements of increasing accuracy, many of the remarkable predictions of general relativity for strongly curved, dynamical spacetimes will be able to be studied observationally. In this talk, I will discuss one class of stronggravity phenomena, called gravitationalwave memory effects, which are predictions of general relativity that are most prominent in systems with high gravitationalwave luminosities, like binary black holes. Memory effects are characterized by changes in the gravitationalwave strain and its time integrals that persist after a transient signal passes by a detector. I will summarize the computation of these effects and the prospects for current and planned future gravitationalwave detectors to detect memory effects from blackhole mergers; in particular, there could be evidence for the memory effect in just a few years of advanced LIGO, Virgo, and KAGRA data at their design sensitivities. I will also review what observing gravitationalwave memory effects can teach us about the symmetries and conserved quantities around isolated systems like binaryblackhole mergers. Time permitting, I will present results on memory effects in scalartensor theories of gravity and on subleading memory effects. Date: 29/04/2021  1:00 pm
Series: Strong Gravity
