Cosmological Constant in the Thermodynamic Models of Gravity
  Within thermodynamic models of gravity, where the universe is considered as a finite ensemble of quantum particles, cosmological constant in the Einstein's equations appears as a constant of integration. Then it can be bounded using Karolyhazy uncertainty relation applied for horizon distances, as the amount of information in principle accessible to an external observer. 
Merab Gogberashvili and Ucha Chutkerashvili
physics.gen-ph