2015 Workshop on Combinatorics and Applications at SJTU

April 21 -- 27, Shanghai Jiao Tong University


Home || Participants || Track A : Spherical Design and Numerical Analysis || Track B : Graph Homomorphisms and Dynamical Systems || Direction


Speaker: Ziqing Xiang (向子卿), University of Georgia

Date: Friday, April 24, 2015

Time: 11:15 - 12:00

Venue: Large Meeting Room, Math Building

Title: Spherical Designs Over a Number Field

Abstract:

Let $k$ be a totally real number field. A spherical design over $k$ is just an ordinary spherical design in which the coordinates of all points are in $k$. One advantage of such designs is that there is no error while calculating something related to such a design in practice. The existence of spherical designs over $\mathbb{Q}$ is open in general. And the most difficult case is the existence of spherical designs over $\mathbb{Q}$ on the one dimensional unit sphere, namely the unit circle. In this talk, I will show that:

The word "many" means that we have an asymptotic lower bound for the number of desgins.

This is joint work with Zhen Cui and Jiacheng Xia.

Slides: View slides


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