Topological sources of soliton mass and supersymmetry breaking

摘要

We derive the Smarr formulae for two five-dimensional solutions of supergravity, which are asymptotically R-1,R-3 x S-1; in particular, one has a magnetic 'bolt' in its center, and one is a two-center solution. We show for both spacetimes that supersymmetry-and so the BPS-bound-is broken by the holonomy and how each topological feature of a space-like hypersurface enters Smarr's mass formula, with emphasis on the ones that give rise to the stated violation of the BPS-bound. In this light, we question if any violating extra-mass term in a spacetime with such asymptotics is only evident in the ADM mass while the Komar mass per se 'tries' to preserve BPS. Finally, we derive the cohomological fluxes for each situation and examine in a more general fashion how the breaking of supersymmetry-and so the BPS-bound violation-is associated with their topologies. In the second (and more complicated) scenario, we especially focus on the compact cycle linking the centers, and the contribution of non-vanishing bulk terms in the mass formula to the breaking of supersymmetry.