Short interval expansion of Renyi entropy on torus

We investigate the short interval expansion of the Renyi entropy for twodimensional conformal field theory (CFT) on a torus. We require the length of the interval to be small with respect to the spatial and temporal sizes of the torus. The operator product expansion of the twist operators allows us to compute the short interval expansion of the Renyi entropy at any temperature. In particular, we pay special attention to the large c CFTs dual to the AdS3 gravity and its cousins. At both low and high temperature limits, we read the Renyi entropies to order l(6), and find good agreements with holographic results. Moreover, the expansion allows us to read 1/c contribution, which is hard to get by expanding the thermal density matrix. We generalize the study to the case with the chemical potential as well.NSFC [11275010, 11325522, 11335012, 11222549, 11575202]; Special Fund for Theoretical Physics from NSFC [11447613]SCI(E)ARTICLEbchen01@pku.edu.cn; wujb@ihep.ac.cn; jjzhang@ihep.ac.cn