ELFT HÍRADÓ

["Szabados,L." <lbszab AT rmki.kfki.hu>]

RELATIVITASELMÉLETI SZEMINARIUM/RELATIVITY SEMINAR


Előadó/Speaker:  Prof. Jörg Frauendiener
                 Department of Mathematics & Statistics,
                 University of Otago, New Zealand

Az előadás cime/Title:  How to kick a black hole


t:       2022 November 7 (hétfő/Monday), 14.00
(x,y,z): KFKI RMKI II. épület/Building 2, médiaterem

Kivonat/Abstract:
It is well known that gravitational waves interact in a non-linear way. 
This makes it difficult to describe them rigorously. The cleanest 
description is based on a certain conformal invariance of the Einstein 
equations - a fact which was established by R. Penrose and was used by H. 
Friedrich to prove several important global results for general 
relativistic space-times. The so-called conformal field equations 
implement this conformal invariance on the level of partial differential 
equations. They provide various well-posed initial (boundary) value 
problems for use in different situations. The talk will give a 
computational perspective on the non-linear interaction of gravitational 
waves with an initially static (and spherically symmetric) black hole. We 
will show how to kick it and possibly how to spin it up.  Time permitting, 
we will also discuss the emergence of quasi-normal modes and the 
Newman-Penrose constants.