ELFT HÍRADÓ

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

RELATIVITASELMELETI SZEMINARIUM


Eloado:  Dr. Martin Scholtz
         Karoly Egyetem, Praga

Az eloadas cime:  The Bondi mass of Einstein-Maxwell-Klein-Gordon
                  spacetimes

t:       2014 aprilis 28 (hetfo), 14.00
(x,y,z): KFKI RMKI III. epulet, tanacsterem

Abstract:
The concept of quasi-local energy-momentum and angular momentum belongs 
to the most challenging problems in general relativity. Many useful 
suggestions how to define quasi-local quantities are based on the 
so-called Nester-Witten form and we briefly review some of them. In 
particular, we start with the motivation behind the Penrose quasi-local 
mass which naturally leads to the twistor equation. As a slight 
digression, we discuss the notion of the twistor in some detail and 
present its geometrical and physical interpretation. After discussing the 
drawbacks of the Penrose mass, we present some other approaches and relate 
them to the surface integral of the Nester-Witten form. Finally we apply 
this formalism to calculate the Bondi mass of asymptotically flat 
spacetimes with interacting electromagnetic and scalar field sources and 
discuss the positivity of the Bondi mass and the properties of 
corresponding massloss formula.