The Langevin description of systems with two symmetric absorbing states yields a phase diagram with three different phases (disordered and active, ordered and active, absorbing) separated by critical lines belonging to three different universality classes (generalized voter, Ising, and directed percolation). In this paper we present a microscopic spin model with two symmetric absorbing states that has the property that the model parameters can be varied in a continuous way. Our results, obtained through extensive numerical simulations, indicate that all features of the Langevin description are encountered for our two-dimensionsal microscopic spin model. Thus the Ising and direction percolation lines merge into a generalized voter critical line at a point in parameter space that is not identical to the classical voter model. A vast range of different quantities are used to determine the universality classes of the order-disorder and absorbing phase transitions. The investigation of time-dependent quantities at a critical point belonging to the generalized voter universality class reveals a more complicated picture than previously discussed in the literature.
Active-Absorbing Phase Transitions in the Parallel Minority Game
School of Computational & Integrative Sciences, Jawaharlal Nehru University（贾瓦哈拉尔·尼赫鲁大学计算与整合科学学院）；Department of Physics, SRM University - AP（安得拉邦SRM大学物理系）
Microphase Separation in Quorum-Sensing Active Particles with Competing Interactions
University of Luxembourg（卢森堡大学）；ISC-CNR, Institute for Complex Systems（复杂系统研究所（ISC-CNR））；NANOTEC-CNR, Soft and Living Matter Laboratory, Institute of Nanotechnology（纳米技术研究所软物质与生命物质实验室（NANOTEC-CNR））
