Scalar Fields in BTZ Black Hole Spacetime and Entanglement Entropy
  We study the quantum scalar fields in background of BTZ black hole spacetime. We calculate the entanglement entropy using the discretized model, which resembles a system of coupled harmonic oscillators. The leading term of the entropy formula is standard Bakenstein-Hawking entropy and sub-leading corresponds to quantum corrections to black hole entropy. We calculate the co-efficent of sub-leading logarithmic corrections numerically. 
Dharm Veer Singh and Sanjay Siwach
hep-th