  
  
Stat 
Members: 3660 Articles: 2'599'751 Articles rated: 2609
10 November 2024 

   

Article overview
 

Twistors and the BMS Group  Adam D. Helfer
;  Date: 
8 Jul 1993  Journal:  Class. Quant. Grav. 11 (1994) 733  Subject:  grqc  Abstract:  We compute the motions of null infinity to which the components of the angular momentum of the gravitational field, as defined by Penrose, are conjugate. We find that the boosts are supplemented by anomalous translations. If $c_{ab}$ is the skew bivector determining the component of the angular momentum in question, the anomaly is proportional to $$c_{ab}t^bphi ^{ad} ,$$ where $t^a$ is a unit vector in the direction of the BondiSachs momentum and $phi _{ab}$ is the quadrupole moment of the shear of the cut at which the angular momentum is evaluated. This effect persists in the weakfield limit. This surprising result is a general consequence of the requirement that angular momentum be supertranslationinvariant in a quiescent regime, and not some essentially twistorial peculiarity.  Source:  arXiv, grqc/9307005  Services:  Forum  Review  PDF  Favorites 


No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

 


