Symplectic Learning Seminar

Speaker: M. Pinsonnault (Western)

"Linear Symplectic Width and Ellipsoids"

Time: 13:30

Room: MC 108

I will continue the survey on linear aspects of symplectic geometry by discussing the relations between linear symplectic capacities and ellipsoids.

Algebra Seminar

Speaker: Emre Coskun (Western)

"The Fine Moduli Space of Representations of Clifford Algebras, Part 1"

Time: 14:30

Room: MC108

Given a fixed binary form $f(u,v)$ of degree $d$ over a field $k$, the associated Clifford algebra is the $k$-algebra $C_f=k\{u,v\}/I$, where $I$ is the two-sided ideal generated by elements of the form $(\alpha u+\beta v)^{d}-f(\alpha,\beta)$ with $\alpha$ and $\beta$ arbitrary elements in $k$. All representations of $C_f$ have dimensions that are multiples of $d$, and occur in families. In this article we construct fine moduli spaces $U=U_{f,r}$ for the $rd$-dimensional representations of $C_f$ for each $r \geq 2$. Our construction starts with the projective curve $C \subset \mathbb{P}^{2}_{k}$ defined by the equation $w^d=f(u,v)$, and produces $U_{f,r}$ as a quasiprojective variety in the moduli space $\mathcal{M}(r,d_r)$ of stable vector bundles over $C$ with rank $r$ and degree $d_r=r(d+g-1) $, where $g$ denotes the genus of $C$.