Entanglement entropy for non-zero genus topologies
  Over the last three decades entanglement entropy has been obtained for quantum fields propagating in genus zero topologies (Spheres). For scalar fields propagating in these topologies, it has been shown that the entanglement entropy scales as area. In the last few years non-trivial topologies are increasingly relevant for different areas. For instance, in describing quantum phases, it has been realized that long-range entangled states are described by topological order. If quantum entanglement can plausibly provide explanation for these, it then imperative to obtain entanglement entropy in these topologies. In this work, using two different methods, we explicitly show that the entanglement entropy scales as area of the genus-1 geometry. 
S. Santhosh Kumar (IISER-TVM), Suman Ghosh (S N Bose) and S.   Shankaranarayanan (IISER-TVM)
hep-th gr-qc quant-ph