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Technical Report CMS-TR-20091102


Title Dynamic Phase Transition in Prisoner's Dilemma on a Lattice with Stochastic Modifications
Author/s M. Ali Saif
Centre for Modeling and Simulation, Savitribai Phule Pune University, Pune 411 007 India


Prashant M. Gade
Department of Applied Science, College of Engineering, Pune 411 005 India
Abstract We present a detailed study of prisoner's dilemma game with stochastic modifications on a two-dimensional lattice, in presence of evolutionary dynamics. By very nature of the rules, the cooperators have incentive to cheat and the fear to being cheated in prisoner's dilemma and may cheat even when not dictated by evolutionary dynamics. We consider two variants. In either case, the agents mimic the action (cooperation or defection) in the previous timestep of the most successful agent in the neighborhood. Over and above this, the fraction p of cooperators spontaneously change their strategy to pure defector at every time step in the first variant. In the second variant, there are no pure cooperators. All cooperators keep defecting with probability p at every time-step. In both cases, the system switches from coexistence state to an all-defector state for higher values of p. We show that the transition between these states unambiguously belongs to directed percolation universality class in 2 + 1 dimension. We also study the local persistence and the persistence exponents are higher than ones obtained in previous studies underlining their dependence on details of dynamics.
Keywords
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Citing This Document M. Ali Saif, and Prashant M. Gade , Dynamic Phase Transition in Prisoner's Dilemma on a Lattice with Stochastic Modifications . Technical Report CMS-TR-20091102 of the Centre for Modeling and Simulation, Savitribai Phule Pune University, Pune 411007, India (2009); available at http://cms.unipune.ac.in/reports/.
Notes, Published Reference, Etc.
Contact ali AT cms.unipune.ac.in
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