Schur Q-functions and a Kontsevich-Witten genus

Combinatorics of the Modular Group II: the Kontsevich integrals

We study algebraic aspects of Kontsevich integrals as generating functions for intersection theory over moduli space and review the derivation of Virasoro and KdV constraints. 1. Intersection numbers 2. The Kontsevich integral 2.1. The main theorem 2.2 Expansion of Z on characters and Schur functions 2.3 Proof of the first part of the Theorem 3. From Grassmannians to KdV 4. Matrix Airy equation and Virasoro highest weight conditions 5. Genus expansion 6. Singular behaviour and Painlev'e equation. 7. Generalization to higher degree potentials

Polynomial averages in the Kontsevich model

We obtain in closed form averages of polynomials, taken over hermitian matrices with the Gaussian measure involved in the Kontsevich integral, and prove a conjecture of Witten enabling one to express analogous averages with the full (cubic potential) measure, as derivatives of the partition function with respect to traces of inverse odd powers of the external argument. The proofs are based on elementary algebraic identities involving a new set of invariant polynomials of the linear group, closely related to the general Schur functions.

W型算子在Schur函数和Schur Q函数上的作用

Action of $W$-type operators on Schur functions and Schur Q-functions

本文研究KP和BKP层次对称代数中的W型微分算子，给出其作用于Schur函数和Schur Q函数的统一公式，并据此简化证明Alexandrov猜想与Mironov-Morozov公式。

$k$-Schur expansions of Catalan functions

We make a broad conjecture about the $k$-Schur positivity of Catalan functions, symmetric functions which generalize the (parabolic) Hall-Littlewood polynomials. We resolve the conjecture with positive combinatorial formulas in cases which address the $k$-Schur expansion of (1) Hall-Littlewood polynomials, proving the $q=0$ case of the strengthened Macdonald positivity conjecture of Lapointe, Lascoux, and Morse; (2) the product of a Schur function and a $k$-Schur function when the indexing partitions concatenate to a partition, describing a class of Gromov-Witten invariants for the quantum coh…

Crystal approach to affine Schubert calculus

We apply crystal theory to affine Schubert calculus, Gromov-Witten invariants for the complete flag manifold, and the positroid stratification of the positive Grassmannian. We introduce operators on decompositions of elements in the type-$A$ affine Weyl group and produce a crystal reflecting the internal structure of the generalized Young modules whose Frobenius image is represented by stable Schubert polynomials. We apply the crystal framework to products of a Schur function with a $k$-Schur function, consequently proving that a subclass of 3-point Gromov-Witten invariants of complete flag va…

Getzler-Gauss-Manin连接与Kontsevich-Soibelman操作在周期性循环同调上的研究

The Getzler-Gauss-Manin connection and Kontsevich-Soibelman operations on the periodic cyclic homology

本文研究了周期性循环同调中源于Kontsevich-Soibelman操作的等变操作，并将其与等变Gromov-Witten理论联系起来，同时探讨了其在辛拓扑中的应用。