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arXiv 1107.4884math-phmath.MP
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Cayley树上硬核模型的$p$ -adic Gibbs测度

On $p$-adic Gibbs Measures for Hard Core Model on a Cayley Tree

D. Gandolfo, U. A. Rozikov, J. Ruiz

摘要:

在本文中,我们考虑了最近邻$p$硬核(HC)模型,逸度$λ$,在一个齐次Cayley树的顺序$k$(与$k + 1$邻居)。我们专注于$p$ -adic吉布斯措施的HC模型,特别是在$p$ -adic“分裂”吉布斯措施生成一个$p$ -adic马尔可夫链沿树上的每条路径。我们证明了$p$-adic HC模型与真实HC模型完全不同:对于固定的$k$,我们证明了$p$-adic HC模型只有当$p$整除$2^k-1$时才有分裂Gibbs测度.此外,若$p$整除$2^k-1$而不整除$k+2$,则存在唯一的平移不变$p$ -adic Gibbs测度.我们还研究了$p$ -adic周期分裂Gibbs测度,证明了上述模型只允许平移不变的周期二(棋盘)Gibbs测度.对于$p\geq 7$(分别$p=2,3,5$),我们给出了必要的和充分的(分别为.必要)的条件存在的周期性$p$ -adic措施。对于k=2的$p$ -adic分裂吉布斯措施存在当且仅当p=3,在这种情况下,我们表明,如果$λ$属于一个$p$ -adic球的半径为1/27,那么正好有两个周期(非平移不变)$p$ -adic吉布斯措施。证明了$p$ -adic Gibbs测度是有界的当且仅当$p\ne 3$ .

英文摘要:

In this paper we consider a nearest-neighbor $p$-adic hard core (HC) model, with fugacity $λ$, on a homogeneous Cayley tree of order $k$ (with $k + 1$ neighbors). We focus on $p$-adic Gibbs measures for the HC model, in particular on $p$-adic "splitting" Gibbs measures generating a $p$-adic Markov chain along each path on the tree. We show that the $p$-adic HC model is completely different from real HC model: For a fixed $k$ we prove that the $p$-adic HC model may have a splitting Gibbs measure only if $p$ divides $2^k-1$. Moreover if $p$ divides $2^k-1$ but does not divide $k+2$ then there exists unique translational invariant $p$-adic Gibbs measure. We also study $p$-adic periodic splitting Gibbs measures and show that the above model admits only translational invariant and periodic with period two (chess-board) Gibbs measures. For $p\geq 7$ (resp. $p=2,3,5$) we give necessary and sufficient (resp. necessary) conditions for the existence of a periodic $p$-adic measure. For k=2 a $p$-adic splitting Gibbs measures exists if and only if p=3, in this case we show that if $λ$ belongs to a $p$-adic ball of radius 1/27 then there are precisely two periodic (non translational invariant) $p$-adic Gibbs measures. We prove that a $p$-adic Gibbs measure is bounded if and only if $p\ne 3$.

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