scholarly journals Geometric positivity in the cohomology of homogeneous spaces and generalized Schubert calculus

2009 ◽  
pp. 77-124 ◽  
Author(s):  
Izzet Coskun ◽  
Ravi Vakil
Keyword(s):  
Homogeneous Spaces ◽  
Schubert Calculus

scholarly journals EQUIVARIANT -THEORY OF GRASSMANNIANS

2017 ◽  
Vol 5 ◽  
Author(s):  
OLIVER PECHENIK ◽  
ALEXANDER YONG
Keyword(s):  
Equivariant Cohomology ◽  
Homogeneous Spaces ◽  
Acta Math ◽  
Schubert Calculus ◽  
Duke Math ◽  
Jeu De Taquin ◽  
Lecture Notes ◽  
Equivariant Theory

We address a unification of the Schubert calculus problems solved by Buch [A Littlewood–Richardson rule for the $K$-theory of Grassmannians, Acta Math. 189 (2002), 37–78] and Knutson and Tao [Puzzles and (equivariant) cohomology of Grassmannians, Duke Math. J.119(2) (2003), 221–260]. That is, we prove a combinatorial rule for the structure coefficients in the torus-equivariant $K$-theory of Grassmannians with respect to the basis of Schubert structure sheaves. This rule is positive in the sense of Anderson et al. [Positivity and Kleiman transversality in equivariant $K$-theory of homogeneous spaces, J. Eur. Math. Soc.13 (2011), 57–84] and in a stronger form. Our work is based on the combinatorics of genomic tableaux and a generalization of Schützenberger’s [Combinatoire et représentation du groupe symétrique, in Actes Table Ronde CNRS, Univ. Louis-Pasteur Strasbourg, Strasbourg, 1976, Lecture Notes in Mathematics, 579 (Springer, Berlin, 1977), 59–113] jeu de taquin. Using our rule, we deduce the two other combinatorial rules for these coefficients. The first is a conjecture of Thomas and Yong [Equivariant Schubert calculus and jeu de taquin, Ann. Inst. Fourier (Grenoble) (2013), to appear]. The second (found in a sequel to this paper) is a puzzle rule, resolving a conjecture of Knutson and Vakil from 2005.

scholarly journals Elliptic classes on Langlands dual flag varieties

2021 ◽  
pp. 2150014
Author(s):  
Richárd Rimányi ◽  
Andrzej Weber
Keyword(s):  
Mirror Symmetry ◽  
Homogeneous Spaces ◽  
Flag Variety ◽  
Schubert Calculus ◽  
Schubert Varieties ◽  
Characteristic Classes ◽  
Flag Varieties ◽  
K Theory

Characteristic classes of Schubert varieties can be used to study the geometry and the combinatorics of homogeneous spaces. We prove a relation between elliptic classes of Schubert varieties on a generalized full flag variety and those on its Langlands dual. This new symmetry is motivated by 3D mirror symmetry, and it is only revealed if Schubert calculus is elevated from cohomology or K theory to the elliptic level.

scholarly journals Combinatorial integers(m,nj)and Schubert calculus in the integral cohomology ring of infinite smooth flag manifolds

2006 ◽  
Vol 2006 ◽  
pp. 1-55
Author(s):  
Cenap Özel ◽  
Erol Yilmaz
Keyword(s):  
Homogeneous Spaces ◽  
Cohomology Ring ◽  
Schubert Calculus ◽  
Flag Manifolds ◽  
Cohomology Algebra ◽  
Loop Groups ◽  
Local Coefficient ◽  
Integral Cohomology ◽  
Ring Structures ◽  
Coefficient Ring

We discuss the calculation of integral cohomology ring ofLG/TandΩG. First we describe the root system and Weyl group ofLG, then we give some homotopy equivalences on the loop groups and homogeneous spaces, and calculate the cohomology ring structures ofLG/TandΩGfor affine groupA^2. We introduce combinatorial integers(m,nj)which play a crucial role in our calculations and give some interesting identities among these integers. Last we calculate generators for ideals and rank of each module of graded integral cohomology algebra in the local coefficient ringℤ[1/2].

Application of Morse theory to some homogeneous spaces

1969 ◽  
Vol 21 (3) ◽  
pp. 343-353 ◽  
Author(s):  
S. Ramanujan
Keyword(s):  
Morse Theory ◽  
Homogeneous Spaces

scholarly journals Gauge × gauge = gravity on homogeneous spaces using tensor convolutions

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
L. Borsten ◽  
I. Jubb ◽  
V. Makwana ◽  
S. Nagy
Keyword(s):  
Homogeneous Spaces ◽  
Gauge Fields ◽  
Convolution Product ◽  
Tensor Fields ◽  
Einstein Universe ◽  
Gauge Transformations ◽  
Yang Mills ◽  
Static Einstein Universe ◽  
Definition Of ◽  
Gauge Gravity

Abstract A definition of a convolution of tensor fields on group manifolds is given, which is then generalised to generic homogeneous spaces. This is applied to the product of gauge fields in the context of ‘gravity = gauge × gauge’. In particular, it is shown that the linear Becchi-Rouet-Stora-Tyutin (BRST) gauge transformations of two Yang-Mills gauge fields generate the linear BRST diffeomorphism transformations of the graviton. This facilitates the definition of the ‘gauge × gauge’ convolution product on, for example, the static Einstein universe, and more generally for ultrastatic spacetimes with compact spatial slices.

scholarly journals LAURENT POLYNOMIAL LANDAU–GINZBURG MODELS FOR COMINUSCULE HOMOGENEOUS SPACES

2021 ◽  
Author(s):  
PETER SPACEK
Keyword(s):  
Homogeneous Space ◽  
Homogeneous Spaces ◽  
Laurent Polynomial ◽  
Complete Intersections ◽  
Laurent Polynomials ◽  
Young Diagrams ◽  
Similar Shape ◽  
Algebraic Torus ◽  
The One ◽  
Polynomial Potentials

AbstractIn this article we construct Laurent polynomial Landau–Ginzburg models for cominuscule homogeneous spaces. These Laurent polynomial potentials are defined on a particular algebraic torus inside the Lie-theoretic mirror model constructed for arbitrary homogeneous spaces in [Rie08]. The Laurent polynomial takes a similar shape to the one given in [Giv96] for projective complete intersections, i.e., it is the sum of the toric coordinates plus a quantum term. We also give a general enumeration method for the summands in the quantum term of the potential in terms of the quiver introduced in [CMP08], associated to the Langlands dual homogeneous space. This enumeration method generalizes the use of Young diagrams for Grassmannians and Lagrangian Grassmannians and can be defined type-independently. The obtained Laurent polynomials coincide with the results obtained so far in [PRW16] and [PR13] for quadrics and Lagrangian Grassmannians. We also obtain new Laurent polynomial Landau–Ginzburg models for orthogonal Grassmannians, the Cayley plane and the Freudenthal variety.

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