Abstract
This chapter discuss several features and connections arising in a class of Ising-based models, namely the Glauber-Ising time dependent model, the Q2R cellular automata, the Schelling model for social segregation, the decision-choice model for social sciences and economics and finally the bootstrap percolation model for diseases dissemination. Although all these models share common elements, like discrete networks and boolean variables, and more important the existence of an Ising-like transition; there is also an important difference given by their particular evolution rules. As a result, the above implies the fact that macroscopic variables like energy and magnetization will show a dependence on the particular model chosen. To summarize, we will discuss and compare the time dynamics for these variables, exploring whether they are conserved, strictly decreasing (or increasing) or fluctuating around a macroscopic equilibrium regime.
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Notes
- 1.
Q by four, quatre, in french, 2 by two steps automata rule as explicitly written below, and R by reversible.
- 2.
The so called “perceive overall incentive agent function”, by Bouchaud [7].
- 3.
This two-step rule may be naturally re-written as a one-step rule with the aid of an auxiliary dynamical variable [9].
- 4.
The criteria (8) may be unified in a single criteria [17] (multiplying both sides of the two inequalities by \(S_k\)): \( \mathrm{an\, individual\,} S_k \, \mathrm{is\, unhappy\, at \, the\, node\,} k \mathrm{\, if\,, and \, only \, if }, \, \, S_k \sum _{i \in V_k}S_i \le |V_k| - 2 \theta _k ,\) which is a kind of energy density instead of the threshold criteria found in Glauber dynamics (4).
- 5.
In statistical physics, \(\beta \) is the inverse of the thermodynamical temperature, \(\beta \sim 1/T\).
- 6.
Q2R is a micro canonical description of the Ising transition, therefore we use the energy in absence of any temperature. In [10] it is shown the excellent agreement among the Q2R bifurcation diagram with the Ising thermodynamical transition.
- 7.
Notice that, as already said, the total magnetization is constant in the Schelling model . Therefore we cannot match the Schelling transitions observed here with the phase transition for the cases of the Glauber-Ising and the Q2R models .
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Acknowledgments
The authors acknowledge Eric Goles, Pablo Medina, Iván Rapaport, and Enrique Tirapegui for their partial contribution to some aspects of the present paper, as well as Aldo Marcareño, Andrea Repetto, Gonzalo Ruz and Romualdo Tabensky for fruitful discussions and valuable comments on different topics of this work. This work is supported by Núcleo Milenio Modelos de Crisis NS130017 CONICYT (Chile). FU. also thanks CONICYT-Chile under the Doctoral scholarship 21140319 and Fondequip AIC-34.
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Mora, F., Urbina, F., Cortez, V., Rica, S. (2016). Around the Ising Model. In: Tlidi, M., Clerc, M. (eds) Nonlinear Dynamics: Materials, Theory and Experiments. Springer Proceedings in Physics, vol 173. Springer, Cham. https://doi.org/10.1007/978-3-319-24871-4_25
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