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Previously we have studied the Generalized Minimal Massive Gravity (GMMG) inasymptotically $AdS_3$ background, and have shown that the theory is free ofnegative-energy bulk modes. Also we have shown GMMG avoids the aforementionedbulk-boundary unitarity clash. Here instead of $AdS_3$ space we considerasymptotically flat space, and study this model in the flat limit. The dualfield theory of GMMG in the flat limit is a $BMS_3$ invariant field theory,dubbed (BMSFT) and we have BMS algebra asymptotically instead of Virasoroalgebra. In fact here we present an evidence for this claim. Entanglemententropy of GMMG is calculated in the background in the flat null infinity. Ourevidence for mentioned claim is the result for entanglement entropy in filedtheory side and in the bulk (in the gravity side). At first using Cardy formulaand Rindler transformation, we calculate entanglement entropy of BMSFT in threedifferent cases. Zero temperature on the plane and on the cylinder, andnon-zero temperature case. Then we obtain the entanglement entropy in the bulk.Our results in gravity side are exactly in agreement with field theorycalculations.

Holographic Entanglement Entropy in flat limit of the Generalized Minimal Massive Gravity model