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The paper concerns the $q$-state Potts model (i.e., with spin values in $\{1,\dots,q\}$) on a Cayley tree $\mathbb{T}^k$ of degree $k\geq 2$ (i.e., with $k+1$ edges emanating from each vertex) in an external (possibly random) field. We…

Mathematical Physics · Physics 2019-07-30 Leonid V. Bogachev , Utkir A. Rozikov

In the paper the Ising model with competing $J_1$ and $J_2$ interactions with spin values $\pm 1$, on a Cayley tree of order 2 (with 3 neighbors) is considered . We study the structure of the ground states and verify the Peierls condition…

Probability · Mathematics 2007-05-23 U. A. Rozikov

In this paper, we continue an investigation of the $p$-adic Ising-Vannimenus model on the Cayley tree of an arbitrary order $k$ $(k\geq 2$). We prove the existence of $p$-adic quasi Gibbs measures by analyzing fixed points of…

Dynamical Systems · Mathematics 2015-10-21 Farrukh Mukhamedov , Mansoor Saburov , Otabek Khakimov

In this paper we consider a model with nearest-neighbor interactions and with the set $[0,1]$ of spin values, on a Cayley tree of order $k \geq 2$. To study translation-invariant Gibbs measures of the model we drive an nonlinear functional…

Mathematical Physics · Physics 2012-10-30 Yu. Kh. Eshkabilov , U. A. Rozikov , G. I. Botirov

We consider nearest-neighbor fertile hard-core models, with three states, on a homogeneous Cayley tree. It is known that there are four type of such models. We investigate all of them and describe translation-invariant and periodic…

Mathematical Physics · Physics 2007-05-23 U. A. Rozikov , Sh. A. Shoyusupov

We consider the Ising model on a Cayley tree . For the Ising model found new weakly periodic measures corresponding normal subgroups of index 2 of the group representation of the tree Cayley.

Statistics Theory · Mathematics 2014-09-17 Muzaffar Rahmatullaev

We consider fertile HC-models with three states on a Cayley tree. It is known that four types of such models exist. For these models we describe the translation-invarinat Gibbs measures on a Cayley tree of order three.

Mathematical Physics · Physics 2015-06-09 Rustam Khakimov

In this paper we construct several models with nearest-neighbor interactions and with the set $[0,1]$ of spin values, on a Cayley tree of order $k\geq 2$. We prove that each of the constructed model has at least two translational-invariant…

Functional Analysis · Mathematics 2015-06-04 Yu. Kh. Eshkabilov , F. H. Haydarov , U. A. Rozikov

We consider fertile HC-models with four-states and the parametre activity on a Cayley tree. It is known that three types of such models exist. For each of these models we prove uniqueness of the translation-invarinat Gibbs measure on a…

Mathematical Physics · Physics 2015-06-09 R. M. Khakimov

For the Ising model on Cayley trees we give a very wide class of new Gibbs measures. We show that these new measures are extreme under some conditions on the temperature. We give a review of all known Gibbs measures of the Ising model on…

Mathematical Physics · Physics 2017-05-16 M. M. Rakhmatullaev , U. A. Rozikov

In this paper is studied HC-models on a Cayley tree. two states HC-model on a Cayley tree and Under some conditions on parameters of the two state HC-model we prove existence exactly two of the weakly periodic (non periodic) Gibbs measures.…

Mathematical Physics · Physics 2016-01-12 Rustam Khakimov

This work is devoted to description of all translation-invariant $p$-adic Gibbs measures for the $q$-state Potts model on a Cayley tree. In particular for the Cayley tree of order three we give exact number of such measures.

Functional Analysis · Mathematics 2014-03-31 Otabek Khakimov

We consider $\mathbb Z$-valued $p$-SOS-models with nearest neighbor interactions of the form $|\omega_v-\omega_w|^p$, and finite-spin ferromagnetic models on regular trees. This includes the classical SOS-model, the discrete Gaussian model…

Probability · Mathematics 2023-03-29 Loren Coquille , Christof Kuelske , Arnaud Le Ny

There are many research works devoted to Gibbs measure for models on Cayley trees. Among these works, there are some works in which the general results are identical, but the considered models are various. In this article, we present the…

Probability · Mathematics 2023-07-28 F. H. Haydarov

We consider a nearest-neighbor $p$-adic $\l$-model with spin values $\pm 1$ on a Cayley tree of order $k\geq 1$. We prove for the model there is no phase transition and as well as the unique $p$-adic Gibbs measure is bounded if and only if…

Mathematical Physics · Physics 2015-06-26 Murod Khamraev , Farrukh Mukhamedov , Utkir Rozikov

We consider translation-invariant splitting Gibbs measures (TISGMs) for the $q$-state Potts model on a Cayley tree of order two. Recently a full description of the TISGMs was obtained, and it was shown in particular that at sufficiently low…

Mathematical Physics · Physics 2017-03-23 D. Gandolfo , M. M. Rahmatullaev , U. A. Rozikov

In this paper we complete the analysis of a statistical mechanics model on Cayley trees of any degree, started in [EsHaRo12,EsRo10,BoEsRo13,JaKuBo14,Bo17]. The potential is of nearest-neighbor type and the local state space is compact but…

Probability · Mathematics 2018-03-09 Golibjon Botirov , Benedikt Jahnel

In this paper, we consider the Ising-Vanniminus model on an arbitrary order Cayley tree. We generalize the results conjectured in [Chinese Journal of Physics, 54 (4), 635-649 (2016)] and [International Journal of Modern Physics,…

Combinatorics · Mathematics 2019-07-01 Hasan Akin

Work is a continuation of work TMPh, 175(2), 2013. We study the Potts model with zero external field on the Cayley tree. It is shown that for any values of the parameter all periodic Gibbs measures are translation-invariant for the q-state…

Statistical Mechanics · Physics 2019-06-26 R. Khakimov , M. Mahammadaliyev

In this paper, we consider Ising-Vannimenus model on a Cayley tree for order two with competing nearest-neighbor, prolonged next-nearest neighbor interactions. We stress that the mentioned model was investigated only numerically, without…

Mathematical Physics · Physics 2015-04-06 Farrukh Mukhamedov , Hasan Akin