Thermodynamics of cosmological horizons in $f(T)$ gravity
  We explore thermodynamics of the apparent horizon in $f(T)$ gravity with both
equilibrium and non-equilibrium descriptions. We find the same dual
equilibrium/non-equilibrium formulation for $f(T)$ as for $f(R)$ gravity. In
particular, we show that the second law of thermodynamics can be satisfied for
the universe with the same temperature of the outside and inside the apparent
horizon.
