scholarly journals An affine quantum cohomology ring for flag manifolds and the periodic Toda lattice

2017 ◽  
Vol 116 (1) ◽  
pp. 135-181
Author(s):  
Augustin-Liviu Mare ◽  
Leonardo C. Mihalcea
Keyword(s):  
Toda Lattice ◽  
Cohomology Ring ◽  
Quantum Cohomology ◽  
Flag Manifolds

scholarly journals The Quantum Cohomology Ring of Flag Varieties

1999 ◽  
Vol 351 (7) ◽  
pp. 2695-2729 ◽  
Author(s):  
Ionuţ Ciocan-Fontanine
Keyword(s):  
Cohomology Ring ◽  
Quantum Cohomology ◽  
Flag Varieties

scholarly journals GLSMs for exotic Grassmannians

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Wei Gu ◽  
Eric Sharpe ◽  
Hao Zou
Keyword(s):  
Global Symmetries ◽  
Sigma Models ◽  
Quantum Cohomology ◽  
Flag Manifolds ◽  
Coulomb Branch ◽  
Linear Sigma Models ◽  
Symplectic Grassmannians ◽  
Orthogonal Grassmannians

Abstract In this paper we explore nonabelian gauged linear sigma models (GLSMs) for symplectic and orthogonal Grassmannians and flag manifolds, checking e.g. global symmetries, Witten indices, and Calabi-Yau conditions, following up a proposal in the math community. For symplectic Grassmannians, we check that Coulomb branch vacua of the GLSM are consistent with ordinary and equivariant quantum cohomology of the space.

scholarly journals Schubert presentation of the cohomology ring of flag manifolds

2015 ◽  
Vol 18 (1) ◽  
pp. 489-506 ◽  
Author(s):  
Haibao Duan ◽  
Xuezhi Zhao
Keyword(s):  
Lie Group ◽  
Maximal Torus ◽  
Cohomology Ring ◽  
Minimal System ◽  
Schubert Calculus ◽  
Flag Manifolds ◽  
Generators And Relations ◽  
Integral Cohomology ◽  
Minimal System Of Generators ◽  
Connected Lie Group

Let $G$ be a compact connected Lie group with a maximal torus $T$. In the context of Schubert calculus we present the integral cohomology $H^{\ast }(G/T)$ by a minimal system of generators and relations.

scholarly journals Quantum cohomology of partial flag manifolds $$F_{n_1 } \ldots _{n_k }$$

1995 ◽  
Vol 170 (3) ◽  
pp. 503-528 ◽  
Author(s):  
Alexander Astashkevich ◽  
Vladimir Sadov
Keyword(s):  
Quantum Cohomology ◽  
Flag Manifolds

scholarly journals Residual categories for (co)adjoint Grassmannians in classical types

2021 ◽  
Vol 157 (6) ◽  
pp. 1172-1206
Author(s):  
Alexander Kuznetsov ◽  
Maxim Smirnov
Keyword(s):  
Automorphism Group ◽  
Cohomology Ring ◽  
Quantum Cohomology ◽  
Algebraic Groups ◽  
Fano Variety ◽  
Flag Varieties ◽  
Picard Number ◽  
Coherent Sheaves ◽  
Small Quantum ◽  
Exceptional Collection

In our previous paper we suggested a conjecture relating the structure of the small quantum cohomology ring of a smooth Fano variety of Picard number 1 to the structure of its derived category of coherent sheaves. Here we generalize this conjecture, make it more precise, and support it by the examples of (co)adjoint homogeneous varieties of simple algebraic groups of Dynkin types $\mathrm {A}_n$ and $\mathrm {D}_n$ , that is, flag varieties $\operatorname {Fl}(1,n;n+1)$ and isotropic orthogonal Grassmannians $\operatorname {OG}(2,2n)$ ; in particular, we construct on each of those an exceptional collection invariant with respect to the entire automorphism group. For $\operatorname {OG}(2,2n)$ this is the first exceptional collection proved to be full.

scholarly journals Schur Times Schubert via the Fomin-Kirillov Algebra

10.37236/3659 ◽  
2014 ◽  
Vol 21 (1) ◽  
Author(s):  
Karola Mészáros ◽  
Greta Panova ◽  
Alexander Postnikov
Keyword(s):  
Cohomology Ring ◽  
Quantum Cohomology ◽  
Flag Manifold ◽  
Combinatorial Proof ◽  
Schubert Polynomial ◽  
Schubert Polynomials ◽  
Small Quantum ◽  
Special Cases ◽  
Expansion Coefficients ◽  
Complex Flag

We study multiplication of any Schubert polynomial $\mathfrak{S}_w$ by a Schur polynomial $s_{\lambda}$ (the Schubert polynomial of a Grassmannian permutation) and the expansion of this product in the ring of Schubert polynomials. We derive explicit nonnegative combinatorial expressions for the expansion coefficients for certain special partitions $\lambda$, including hooks and the $2\times 2$ box. We also prove combinatorially the existence of such nonnegative expansion when the Young diagram of $\lambda$ is a hook plus a box at the $(2,2)$ corner. We achieve this by evaluating Schubert polynomials at the Dunkl elements of the Fomin-Kirillov algebra and proving special cases of the nonnegativity conjecture of Fomin and Kirillov.This approach works in the more general setup of the (small) quantum cohomology ring of the complex flag manifold and the corresponding (3-point) Gromov-Witten invariants. We provide an algebro-combinatorial proof of the nonnegativity of the Gromov-Witten invariants in these cases, and present combinatorial expressions for these coefficients.

scholarly journals Quantum Cohomology and the Periodic Toda Lattice

2001 ◽  
Vol 217 (3) ◽  
pp. 475-487 ◽  
Author(s):  
Martin A. Guest ◽  
T. Otofuji
Keyword(s):  
Toda Lattice ◽  
Quantum Cohomology
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