Supersymmetric M3-branes and G2 manifolds

Supersymmetric M3-branes and G2 Manifolds M. Cvetič † , G.W. Gibbons ], H. Lü ? and C.N. Pope ‡ †Department of Physics and Astronomy, University of Pennsylvania Philadelphia, PA 19104, USA ]DAMTP, Centre for Mathematical Sciences, Cambridge University Wilberforce Road, Cambridge CB3 OWA, UK ?Michigan Center for Theoretical Physics, University of Michigan Ann Arbor, MI 48109, USA ‡Center for Theoretical Physics, Texas A&M University, College Station, TX 77843, USA †Institute for Theoretical Physics, University of California Santa Barbara, CA 93106, USA ABSTRACT