English

Intersection theoretic inequalities via Lorentzian polynomials

Algebraic Geometry 2024-05-24 v3 Combinatorics Metric Geometry

Abstract

We explore the applications of Lorentzian polynomials to the fields of algebraic geometry, analytic geometry and convex geometry. In particular, we establish a series of intersection theoretic inequalities, which we call rKT property, with respect to mm-positive classes and Schur classes. We also study its convexity variants -- the geometric inequalities for mm-convex functions on the sphere and convex bodies. Along the exploration, we prove that any finite subset on the closure of the cone generated by mm-positive classes can be endowed with a polymatroid structure by a canonical numerical-dimension type function, extending our previous result for nef classes; and we prove Alexandrov-Fenchel inequalities for valuations of Schur type. We also establish various analogs of sumset estimates (Pl\"{u}nnecke-Ruzsa inequalities) from additive combinatorics in our contexts.

Keywords

Cite

@article{arxiv.2304.04191,
  title  = {Intersection theoretic inequalities via Lorentzian polynomials},
  author = {Jiajun Hu and Jian Xiao},
  journal= {arXiv preprint arXiv:2304.04191},
  year   = {2024}
}

Comments

minor revisions; to appear in Math. Ann

R2 v1 2026-06-28T09:55:59.875Z