[hep-th] Seminar grupe za gravitaciju, cestice i polja

[Branislav Cvetkovic]

Postovane kolege,

U petak 12.09. u 11h na Institutu za fiziku, u sali 360, Jens Boss sa 
Instituta za tehnologiju u Karlsrueu ce odrzati seminar pod naslovom

"Translation invariant' black hole: autoparallels and complete 
integrability"


Abstract: We consider the autoparallel motion of test bodies in static, 
spherically symmetric spacetimes with torsion. We prove complete 
integrability of such motion for a wide range of off-shell geometries 
via four commuting autoparallel Killing vectors. Since these vectors 
reduce to translation generators in a certain limit, we refer to these 
geometries as `translation invariant.' Invoking the field equations of 
quadratic Poincaré gauge gravity we re-derive an exact Schwarzschild 
black hole solution endowed with a non-trivial torsion field scaling as 
GM/r^2, where M denotes the ADM mass of the black hole. Studying the 
qualitative orbital dynamics via effective potentials we find notable 
discrepancies between autoparallels (straightest possible paths) and 
geodesics (shortest possible paths).

Pozdrav Branislav
-- 
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
http://www.ipb.ac.rs/