Apparaît dans la collection : Combinatorics and Arithmetic for Physics : Special Days
A now classical method to construct the Schur functions is constructing matrix el-
ements using half vertex operators associated to the classical boson-fermion cor-
respondence. This construction is known as using free fermions. Schur functions
are also known to be polynomial representatives of cohomology classes of Schu-
bert varieties in the Grassmannian. By instead using K-theory, the representatives
become the (symmetric) Grothendieck polynomials. A recent generalization was
given by Hwang et al. called the (refined) canonical Grothendieck polynomials
based on the work of Galashin–Grinberg–Liu and Yeliussizov. In this talk, we
take the Jacobi–Trudi formulas of Hwang et al. as our definition and use Wick’s
theorem to give a presentation for the canonical Grothendieck polynomials and
their dual basis using free fermions. This generalizing the recent work of Iwao.
Using this, we derive many known identities, as well as some new ones, through
simple computations. This is based on joint work with Shinsuke Iwao and Kohei
Motegi (arXiv: 2211.05002).