Rules for Localized Overlappings and Intersections of p-Branes

TL;DR

This paper derives algebraic rules for intersecting extremal p-branes, systematically organizing known solutions and exploring bound states with non-harmonic functions, connecting them through dualities in string/M-theory.

Contribution

It provides a unified algebraic framework for p-brane intersections, including bound states with non-harmonic functions, and clarifies their relation via dualities in higher-dimensional theories.

Findings

Derived a unique intersection rule for localized p-branes.

Systematically collected solutions compatible with the rule.

Identified a different algebraic rule for bound states with non-harmonic functions.

Abstract

We determine an intersection rule for extremal p-branes which are localized in their relative transverse coordinates by solving, in a purely bosonic context, the equations of motion of gravity coupled to a dilaton and n-form field strengths. The unique algebraic rule we obtained does not lead to new solutions while it manages to collect, in a systematic way, most of the solutions (all those compatible with our ansatz) that have appeared in the literature. We then consider bound states of zero binding energy where a third brane is accomodated in the common and overall transverse directions. They are given in terms of non-harmonic functions. A different algebraic rule emerges for these last intersections, being identical to the intersection rule for p-branes which only depend on the overall transverse coordinates. We clarify the origin of this coincidence. The whole set of solutions in ten and eleven dimensional theories is connected by dualities and dimensional reductions. They are related to brane configurations recently used to study non-perturbative phenomena in supersymmetric gauge theories.