Seminář se koná v úterý ve 13:10 v posluchárně ÚTF MFF UK
v 10. patře katedrové budovy v Tróji, V Holešovičkách 2, Praha 8
The interpretation of so-called cosmic string in black hole spacetimes has settled down to an unsatisfactory state. I try to provide a different model for these cosmic strings by explicit construction of these spacetimes from the Bonnor rocket solution. It is shown that the correct stress-energy tensor is that of null dust with a rather strange energy density - first derivative of Dirac delta distribution. We will discuss the Schwarzschild solution and the C-metric. In the latter case we will show that there is a momentum flux through the cosmic string, causing the acceleration of the black hole.
Jiří Bičák Oldřich Semerák