String Theory Journal Club

By using the hemisphere partition function for Gauged Linear Sigma Models as a guide, we obtain an expression for central charges of B-branes on LG orbifolds. This include exact expressions for the I-function and the Gamma class for a large class of LG orbifold theories. In mathematical terms, this is corresponds to an integral structure in Fan-Jarvis-Ruan-Witten (FJRW) theory. We extend some results from the mathematical literature and, if time allows, I will present some conjectures about flat coordinates in LG orbifolds. (A good review is https://arxiv.org/abs/1503.01223)