{"paper":{"title":"New divisors in the boundary of the instanton moduli space","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"math.AG","authors_text":"Alexander S. Tikhomirov, Dimitri Markushevich, Marcos Jardim","submitted_at":"2015-01-05T00:17:44Z","abstract_excerpt":"Let ${\\mathcal I}(n)$ denote the moduli space of rank $2$ instanton bundles of charge $n$ on ${\\mathbb P}^3$. We know from several authors that ${\\mathcal I}(n)$ is an irreducible, nonsingular and affine variety of dimension $8n-3$. Since every rank $2$ instanton bundle on ${\\mathbb P}^3$ is stable, we may regard ${\\mathcal I}(n)$ as an open subset of the projective Gieseker--Maruyama moduli scheme ${\\mathcal M}(n)$ of rank $2$ semistable torsion free sheaves $F$ on ${\\mathbb P}^3$ with Chern classes $c_1=c_3=0$ and $c_2=n$, and consider the closure $\\overline{{\\mathcal I}(n)}$ of ${\\mathcal I"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.00736","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}