Classical particles in the continuum subjected to high density boundary conditions

We consider a continuous system of classical particles confined in a finite region $Λ$ of $\mathbb{R}^d$ interacting through a superstable and tempered pair potential in presence of non free boundary conditions. We prove that the thermodynamic limit of the pressure of the system at any fixed inverse temperature $β$ and any fixed fugacity $λ$ does not depend on boundary conditions produced by particles outside $Λ$ whose density may increase sub-linearly with the distance from the origin at a rate which depends on how fast the pair potential decays at large distances. In particular, if the pair potential $v(x-y)$ is of Lennard-Jones type, i.e. it decays as $C/\|x-y\|^{d+p}$ (with $p>0$) where $\|x-y\|$ is the Euclidean distance between $x$ and $y$, then the existence of the thermodynamic limit of the pressure is guaranteed in presence of boundary conditions generated by external particles which may be distributed with a density increasing with the distance $r$ from the origin as $ρ(1+ r^q)$, where $ρ$ is any positive constant (even arbitrarily larger than the density $ρ_0(β,λ)$ of the system evaluated with free boundary conditions) and $q\le {1\over 2}\min\{1, p\}$.

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