#### Bilkent University General Seminars

Non-Stationary Energy in General Relativity
Bayram Tekin
Middle East Technical University, Turkey
Özet : Using the time evolution equations of (cosmological) General Relativity in the first order Fischer-Marsden form, we construct an integral that measures the amount of non-stationary energy on a given spacelike hypersurface in D dimensions. The integral vanishes for stationary spacetimes; and with a further assumption, reduces to Dain’s invariant on the boundary of the hypersurface which is defined with the Einstein constraints and a fourth order equation defining approximate Killing symmetries.
 Tarih : 28.11.2019 Saat : 14:40 Yer : Bilkent Matematik Bölümü Seminer Odası SA - 141 Dil : English