On the maximal and minimal degree components of the cocenter of the cyclotomic KLR algebras

Abstract: Let $\mathscr{R}\alpha^\Lambda$ be the cyclotomic KLR algebra associated to a symmetrizable Kac-Moody Lie algebra $\mathfrak{g}$ and polynomials ${Q{ij}(u,v)}{i,j\in I}$. Shan, Varagnolo and Vasserot show that, when the ground field $K$ has characteristic $0$, the degree $d$ component of the cocenter $Tr(\mathscr{R}\alpha^\Lambda)$ is nonzero only if $0\leq d\leq d_{\Lambda,\alpha}$. In this paper we show that this holds true for arbitrary ground field $K$, arbitrary $\mathfrak{g}$ and arbitrary polynomials ${Q_{ij}(u,v)}{i,j\in I}$. We generalize our earlier results on the $K$-linear generators of $Tr(\mathscr{R}\alpha^\Lambda), Tr(\mathscr{R}\alpha^\Lambda)_0, Tr(\mathscr{R}\alpha^\Lambda){d{\Lambda,\alpha}}$ to arbitrary ground field $K$. Moreover, we show that the dimension of the degree $0$ component $Tr(\mathscr{R}\alpha^\Lambda)_0$ is always equal to $\dim V(\Lambda){\Lambda-\alpha}$, where $V(\Lambda)$ is the integrable highest weight $U(\mathfrak{g})$-module with highest weight $\Lambda$, and we obtain a basis for $Tr(\mathscr{R}_\alpha^\Lambda)_0$.