Entanglement of arbitrary spin modes in an expanding universe
  Pair particle creation is a well-known effect on the domain of field theory in curved space-time. It is shown that the entanglement generations for spin-0 and spin-1/2 modes are different in Friedmann-Robertson-Walker (FRW) space-time. We consider the spin-1 particles in FRW space-time using Duffin-Kemmer-Petiao (DKP) equation and obtain a measure of the generated entanglement. Also, we consider the spin-3/2 particles. We argue that the absolute value of the spin does not play any role in entanglement generation and the differences are due to the bosonic or fermionic properties. 
Zahra Ebadi, Hossein Mehri-Dehnavi, Behrouz Mirza, Hosein   Mohammadzadeh and Robabeh Rahimi
quant-ph hep-th