Glauber dynamics phase transitions in athermal random field Blume-Capel and Blume-Emery-Griffiths models
Abstract
We solve the two models for Glauber dynamics and in equilibrium, both in the presence and absence of the external magnetic field on a complete graph. We compare the steady state of the Glauber dynamics with equilibrium and find that for low values of variance R2 of the Gaussian random field, the steady state of the Glauber dynamics depends on the initial state. Beyond a critical value Rc the equilibrium and non equilibrium steady states coincide. The variance R in random field models behaves similar to the temperature. The location of both the continuous and first order transitions can be obtained exactly for the Glauber dynamics steady state. The frustration is introduced by considering repulsive bi-quadratic interaction for Blume-Emery-Griffiths model. We also consider repulsive bi-quadratic interaction and show that Rc can become zero depending on the value of the crystal field. Interestingly, we also find that even when a system has Rc=0 at the start of quasi-static evolution with Glauber dynamics, with increasing R, in some regime of the couplings, the model undergoes a crossover to a random field Ising model universality with Rc changing from $0$ to √(2/π). In the presence of uniform magnetic field, regions of first order transition exhibit hysteresis under Glauber dynamics. These models exhibit rectangular, hexagonal, parallelogram, wasp-waisted, and double hysteresis loops. We derive the shapes of hysteresis loops analytically and also the equation for the coercive field. We show that while the area under the hysteresis loop depends on R, the shape is determined by the behavior of the models at R=0. In particular, in the case of Blume-Emery-Griffiths model the hysteresis plots have regions of continuous and first order transitions both, resulting in a rich phase diagram that depends non-trivially on the initial state.
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BibTeX
@misc{sumedha2026glauber,
title = {{Glauber dynamics phase transitions in athermal random field Blume-Capel and Blume-Emery-Griffiths models}},
author = {Sumedha and Aldrin B E},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.16561},
eprint = {2607.16561},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.16561},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Glauber dynamics phase transitions in athermal random field Blume-Capel and Blume-Emery-Griffiths models
AU - Sumedha
AU - Aldrin B E
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2607.16561
UR - https://arxiv.org/abs/2607.16561
AB - We solve the two models for Glauber dynamics and in equilibrium, both in the presence and absence of the external magnetic field on a complete graph. We compare the steady state of the Glauber dynamics with equilibrium and find that for low values of variance R^2 of the Gaussian random field, the steady state of the Glauber dynamics depends on the initial state. Beyond a critical value R_c the equilibrium and non equilibrium steady states coincide. The variance R in random field models behaves similar to the temperature. The location of both the continuous and first order transitions can be obtained exactly for the Glauber dynamics steady state. The frustration is introduced by considering repulsive bi-quadratic interaction for Blume-Emery-Griffiths model. We also consider repulsive bi-quadratic interaction and show that R_c can become zero depending on the value of the crystal field. Interestingly, we also find that even when a system has R_c=0 at the start of quasi-static evolution with Glauber dynamics, with increasing R, in some regime of the couplings, the model undergoes a crossover to a random field Ising model universality with R_c changing from $0$ to √(2/π). In the presence of uniform magnetic field, regions of first order transition exhibit hysteresis under Glauber dynamics. These models exhibit rectangular, hexagonal, parallelogram, wasp-waisted, and double hysteresis loops. We derive the shapes of hysteresis loops analytically and also the equation for the coercive field. We show that while the area under the hysteresis loop depends on R, the shape is determined by the behavior of the models at R=0. In particular, in the case of Blume-Emery-Griffiths model the hysteresis plots have regions of continuous and first order transitions both, resulting in a rich phase diagram that depends non-trivially on the initial state.
ER -