English

Cobordism-valued intersection theory on $\overline{\mathcal{M}}_{0,n}$

Algebraic Geometry 2026-03-05 v1 Algebraic Topology K-Theory and Homology

Abstract

We calculate the genus zero cobordism-valued Gromov-Witten invariants of a point by refining the string equation on M0,n\overline{\mathcal{M}}_{0,n} from the Chow ring to algebraic cobordism. This gives inductive formulas for cobordism-valued psi-class intersections on M0,n\overline{\mathcal{M}}_{0,n}, and in particular the cobordism classes [M0,n][\overline{\mathcal{M}}_{0,n}], and for their images in KK-theory. Explicit formulas are given up to n=8n = 8.

Keywords

Cite

@article{arxiv.2603.03829,
  title  = {Cobordism-valued intersection theory on $\overline{\mathcal{M}}_{0,n}$},
  author = {Benjamin Ellis-Bloor},
  journal= {arXiv preprint arXiv:2603.03829},
  year   = {2026}
}

Comments

23 pages, comments welcome!

R2 v1 2026-07-01T11:02:38.011Z