Publications (4)7.37 Total impact
Article: Open M5-branes.[show abstract] [hide abstract]
ABSTRACT: We show how, in heterotic M theory, an M5-brane in the 11-dimensional bulk may end on an "M9-brane" boundary, the M5-brane boundary being a Yang-monopole 4-brane. This possibility suggests various novel 5-brane configurations of heterotic M theory, in particular, a static M5-brane suspended between the two M9-brane boundaries, for which we find the asymptotic heterotic supergravity solution.Physical Review Letters 01/2007; 97(23):231601. · 7.37 Impact Factor
Article: BPS states of D=4 N=1 supersymmetry[show abstract] [hide abstract]
ABSTRACT: We find the combinations of momentum and domain-wall charges corresponding to BPS states preserving 1/4, 1/2 or 3/4 of D=4 N=1 supersymmetry, and we show how the supersymmetry algebra implies their stability. These states form the boundary of the convex cone associated with the Jordan algebra of $4\times 4$ real symmetric matrices, and we explore some implications of the associated geometry. For the Wess-Zumino model we derive the conditions for preservation of 1/4 supersymmetry when one of two parallel domain-walls is rotated and in addition show that this model does not admit any classical configurations with 3/4 supersymmetry. Our analysis also provides information about BPS states of N=1 D=4 anti-de Sitter supersymmetry.02/2000;
[show abstract] [hide abstract]
ABSTRACT: We construct a solution to the low-energy string equations of motion in five dimensions that describes a circular loop of fundamental string exponentially expanding in a background electric H field. Euclideanizing this gives an instanton for the creation of a loop of fundamental string in a background H field, and we calculate the rate of nucleation. Solutions describing magnetically charged strings and p-branes, where the gauge field comes from Kaluza-Klein reduction on a circle, are also constructed. It is known that a magnetic flux tube in four (reduced) spacetime dimensions is unstable to the pair creation of Kaluza-Klein monopoles. We show that in (4+p) dimensions, magnetic (p+1) ‘‘flux-branes’’ are unstable to the nucleation of a magnetically charged spherical p-brane. In ten dimensions the instanton describes the nucleation of a Ramond-Ramond magnetically charged six-brane in type IIA string theory. We also find static solutions describing spherical charged p-branes or fundamental strings held in unstable equilibrium in appropriate background fields. Instabilities of intersecting magnetic flux-branes are also discussed. © 1996 The American Physical Society.Phys. Rev. D. 06/1996; 53(12).
Article: Intersecting domain walls in MQCD[show abstract] [hide abstract]
ABSTRACT: We argue that MQCD admits intersecting domain walls that are realized as Cayley calibrations of the MQCD M5-brane. We discuss various dual realizations and comment on how branes can realise domain walls in N=1 supersymmetric theories in D=3.Physics Letters B.