Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-07-27
Physics
High Energy Physics
High Energy Physics - Theory
51 pages; v3: substantial revision (20% longer): we had missed some cases, but the paper now includes a check of our results v
Scientific paper
Smooth Freund-Rubin backgrounds of eleven-dimensional supergravity of the form AdS_4 x X^7 and preserving at least half of the supersymmetry have been recently classified. Requiring that amount of supersymmetry forces X to be a spherical space form, whence isometric to the quotient of the round 7-sphere by a freely-acting finite subgroup of SO(8). The classification is given in terms of ADE subgroups of the quaternions embedded in SO(8) as the graph of an automorphism. In this paper we extend this classification by dropping the requirement that the background be smooth, so that X is now allowed to be an orbifold of the round 7-sphere. We find that if the background preserves more than half of the supersymmetry, then it is automatically smooth in accordance with the homogeneity conjecture, but that there are many half-BPS orbifolds, most of them new. The classification is now given in terms of pairs of ADE subgroups of quaternions fibred over the same finite group. We classify such subgroups and then describe the resulting orbifolds in terms of iterated quotients. In most cases the resulting orbifold can be described as a sequence of cyclic quotients.
Figueroa-O'Farrill José
Medeiros Paul de
No associations
LandOfFree
Half-BPS M2-brane orbifolds does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Half-BPS M2-brane orbifolds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Half-BPS M2-brane orbifolds will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-321571