Absorbing State Transition

Contact Process (DP universality)
λ_c ≈ 3.297 (1D), 1.649 (2D)
ρ ~ (λ-λ_c)^β β=0.2765 (1D)
ξ ~ |λ-λ_c|^-ν_⊥ ν_⊥=1.097