PhD Seminar: Construction of an analytical model for the (l=2, m=0) spherical harmonic containing the memory effect

Title: Construction of an analytical model for the (l=2, m=0) spherical harmonic containing the memory effect
Author: Maria Rosselló Sastre
Date: 03/07/2023
Abstract:
An interesting feature of gravitational waves, which has been known since the 1970s, but not yet observed, is the phenomenon referred to as the “memory effect.” It arises from the principles outlined in the theory of General Relativity as a nonlinear effect that manifests as a permanent change in the space-time metric that remains once the gravitational waves have passed. The present seminar aims to provide an introduction to the theoretical framework associated with this phenomenon, and then focus into the modeling thereof.

The vast majority of waveform models currently used do not incorporate the memory effect, whose strongest contribution is contained in the (l=2, m=0) spherical harmonic. As the sensitivity of gravitational wave detectors continues to improve, the demand for more precise waveform models grows, becoming necessary models that account for the entirety of gravitational wave behavior, enabling a more accurate determination of source properties. Thus, our emphasis lies in constructing a model that encompasses this particular mode, describing both the ringdown oscillations and the memory contribution. The model we present is constructed based on analytical expressions and it is able to describe the (2,0) mode of gravitational waves sourced by non-precessing, quasicircular binary black hole systems.

Dimecres 5 de juliol de 2023, a les 12 h

Edifici Antoni Maria Alcover i Sureda, SAL04a

UIB