Sine-Gordon Theory : Entanglement entropy and holography
  We compute change in entanglement entropy for a single interval in $1+1$ dimensional sine-Gordon model perturbatively in the coupling. The sine-Gordon perturbation can be thought of as deformation of the free CFT by a primary operator with dimension $\Delta$. In an independent computation we calculate holographic entanglement entropy for that interval from three dimensional bulk AdS which has a massive scalar with its mass satisfying $m^2= \Delta(\Delta-2)$. We show that the two results match for near-marginal perturbations upto leading order in the coupling. 
Pinaki Banerjee, Atanu Bhatta and B. Sathiapalan
hep-th cond-mat.str-el gr-qc