Systoles of hyperbolic surfaces with big cyclic symmetry

Abstract

We obtain the exact values of the systoles of these hyperbolic surfaces of genus $g$ with cyclic symmetries of the maximum order and the next maximum order. Precisely: for genus $g$ hyperbolic surface with order $4g+2$ cyclic symmetry, the systole is $2\mathrm{arccosh}(1+\cos \frac{\pi }{2g+1}+\cos \frac{2\pi }{2g+1})$ when $g\ge 7$, and for genus $g$ hyperbolic surface with order $4g$ cyclic symmetry, the systole is $2\mathrm{arccosh}(1+2\cos \frac{\pi }{2g})$ when $g\ge 4$.

25 pages, 33 figures, accepted for publication in SCIENCE CHINA Mathematics