Intersection bounds for BPS strings in six-dimensional supergravity

Hee‐Cheol Kim

doi:10.1007/jhep10(2026)051

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Intersection bounds for BPS strings in six-dimensional supergravity

2026-10-05

Hee‐Cheol Kim *

Kai Xu

DOI：10.1007/jhep10(2026)051

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Abstract

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In six-dimensional $$ \mathcal{N} $$ = (1, 0) supergravity, the structure of tensor moduli space is governed by primitive BPS string charges known as BPS generators and their intersection pairing. We derive bounds on the intersection numbers of these generators from a purely effective field theory (EFT) perspective. Although gauge anomaly cancellation constrains intersections between generators supporting gauge algebras, bounds for E-strings intersecting generators with self-intersection numbers −2 and −3 have previously remained incomplete. We show that the Zariski decomposition, interpreted as the charge lattice counterpart of the attractor mechanism, together with current algebra embeddings on the E-string worldsheet theory, yields strong universal bounds on these intersection numbers. These results establish the finiteness of tensor charge intersection data up to E-string sector. The underlying structure was identified through AI-guided investigation and is proven here analytically using EFT arguments.

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