2 problems

Let $G$ act on a space covered by $G$-stable patches $U_{\alpha}$, and let $\gamma^g_{\alpha}:U_{\alpha}\to U(N)$ describe the action of $g\in G$ on a D-brane $U(N)$ gauge field. L…

Let a Calabi–Yau variety admit a relatively minimal genus-one fibration with multiple fibers, and let a multiple fiber have multiplicity $m$. Discrete-torsion conjecture. The multi…